Highlights of Fluid Dynamics (DFD) Talks @ APS 2020 March Meeting
American Physics Society (APS) March meeting is one of the largest physics meetings in the world. In 2020, the meeting was canceled due to concerns over the rapid spread of COVID-19.
To help the community quickly catch up on the work to be presented in this meeting, Paper Digest Team processed all talk abstracts, and generated one highlight sentence (typically the main topic) for each. Readers are encouraged to read these machine generated highlights / summaries to quickly get the main idea of each talk. This article is on the talks related to Fluid Dynamics (DFD).
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TABLE : Fluid Dynamics (DFD)
| Title | Authors | Highlight | Session | |
|---|---|---|---|---|
| 1 | Re-Printable, Self-Healing Polymer Networks | Sukhishvili, Svetlana; Gardea, Frank; Zhou, Qing | We report a versatile approach to designing 3D printable, re-processable dynamic covalent networks with controllable mechanical properties. | Session 1: 3D Printing of Polymers and Soft Materials |
| 2 | Reactive Processing in Extrusion based Polymeric 3D Printing with Surface Segregating Additives | Levenhagen, Neiko; Dadmun, Mark | Reactive Processing in Extrusion based Polymeric 3D Printing with Surface Segregating Additives | Session 1: 3D Printing of Polymers and Soft Materials |
| 3 | 3D Printing Polylactic Acid: modelling residual alignment, annealing and templated crystallinity | McIlroy, Claire; Graham, Richard; Cavallo, Dario; Seppala, Jon; Kotula, Anthony | We propose that this micro-structure leads to reduced weld strength. | Session 1: 3D Printing of Polymers and Soft Materials |
| 4 | Determination of polymer chain orientation in 3D printed filaments using Polarized Raman spectroscopy and Birefringence | Hassan, Nora; Seppala, Jonathan; Kotula, Anthony; Hight Walker, Angela; Migler, Kalman | To study orientation and alignment of molecular chains in 3D printed polycarbonate filaments, we used a combination of polarized Raman spectroscopy and birefringence measurements. | Session 1: 3D Printing of Polymers and Soft Materials |
| 5 | Mechanical Properties of an Additively Manufactured Cyanate Ester | Giovino, Marissa; Koerner, Hilmar; Baur, Jeffery | Mechanical Properties of an Additively Manufactured Cyanate Ester | Session 1: 3D Printing of Polymers and Soft Materials |
| 6 | Effect of Chain Alignment and Entanglements on Thermal Welding in Fused Filament Fabrication | Galvani, Marco; Robbins, Mark | To address this puzzle we performed molecular dynamics simulations of welding between polymer melts with different degrees of initial alignment. | Session 1: 3D Printing of Polymers and Soft Materials |
| 7 | 3D Printing of Polymers and Soft Materials | Seppala, Jon | This talk will cover “traditional” and emerging soft 3DP processes, material physics, measurement and modeling challenges, and opportunities. | Session 1: 3D Printing of Polymers and Soft Materials |
| 8 | Using Eigenvector Centrality to Predict the Mechanical Properties of Structured Materials | Welch, Cynthia; Welch, Paul; Patterson, Brian; Herman, Matthew; Kuettner, Lindsey | Our ultimate objectives are to provide a simple reduced-order model for predicting mechanical parameters for tailored structures and to better inform engineering models. | Session 1: 3D Printing of Polymers and Soft Materials |
| 9 | Mechanical Enhancement of Polydopamine Nano-Coatings via Thermal Annealing | Malollari, Katerina; Delparastan, Peyman; Fink, Tanner; Zha, Helen; Messersmith, Phillip | Here, we demonstrate thermal annealing at a moderate temperature (130 C) as a facile route to enhance mechanical robustness of pDA coatings. | Session 1: 3D Printing of Polymers and Soft Materials |
| 10 | The Role of Ionization in Thermal Transport of Solid Polyelectrolytes | Luo, Tengfei; Wei, Xingfei | In this work, we use molecular dynamics simulations to study the thermal transport mechanism of solid polyelectrolytes, poly(acrylic acid) (PAA) and its ionized forms. | Session 1: 3D Printing of Polymers and Soft Materials |
| 11 | Printing direction dependent microstructures in direct ink writing | Friedrich, Leanne; Begley, Matthew | We propose an analytical model for diagnosing sources of printing direction-dependent flows and particle distributions. | Session 1: 3D Printing of Polymers and Soft Materials |
| 12 | Polymer Network Formation in Epoxy-Acrylate Dual-Cure Thermoset Resins for Direct Ink Write Additive Manufacturing | Appelhans, Leah; Kopatz, Jessica; Unangst, Jaclynn; Cook, Adam; Reinholtz, Derek | Development of methods to additively manufacture thermoset resins will enable additive approaches for a broad scope of materials including structural materials and advanced composites. | Session 1: 3D Printing of Polymers and Soft Materials |
| 13 | Understanding the structure-property relationships of nanostructured epoxy inks for direct ink writing | Liu, Deborah; Donely, Gavin; Rogers, Simon; Krogstad, Daniel | In this presentation, we will discuss how these nanostructures affects the rheology and the printability of the inks as well as the epoxy crosslinking kinetics. | Session 1: 3D Printing of Polymers and Soft Materials |
| 14 | Chemical Approaches to Diversifying the 3D Printing Ecosystem | Boydston, Andrew | As a representative example, we will discuss progress toward simultaneous photo-radical/photo-cationic printing mechanisms for production of multimaterial parts. | Session 1: 3D Printing of Polymers and Soft Materials |
| 15 | 3D Control of Properties in Single-Material Digital Stereolithography for the Treatment of Growth Plate Injury | Uzcategui, Asais Camila; Higgins, Callie; Hergert, John; Muralidharan, Archish; Kilgore, Jason; Bryant, Stephanie; McLeod, Robert | In this work we use a poly(ethylene glycol) diacrylate based hydrogel to implement a step function and a gradual change in mechanical properties in 3D scaffolds. | Session 1: 3D Printing of Polymers and Soft Materials |
| 16 | Cure Depth Effects on Photopolymer Reactivity in Stereolithography 3D Printing | Smallwood, Anna; Adley, Rykelle; Jacott, Caius; Ryu, Chang | This study seeks to investigate the effect of photoinitiator concentration on these characteristics. | Session 1: 3D Printing of Polymers and Soft Materials |
| 17 | Design and Fabrication of 3D Printed Polymer Composites using Grayscale Stereolithography | Hergert, John; Uzcategui, Asais; Muralidharan, Archish; McLeod, Robert | A deterministic model for polymer conversion in the printing process is utilized to inform printing conditions such that final composite properties can be predicted. | Session 1: 3D Printing of Polymers and Soft Materials |
| 18 | Theory and Implementation of Volumetric 3D Printing | Rackson, Charles; Shusteff, Maxim; McLeod, Robert | We describe theoretical limitations to the method, experimental implementation, and how the coupling of optics and materials informs system design. | Session 1: 3D Printing of Polymers and Soft Materials |
| 19 | Stiffness can mediate the balance between hydrodynamic forces and avidity to impact the targeting of flexible polymeric nanoparticles in flow | Farokhirad, Samaneh; Ranganathan, Abhay; Myerson, Jacob; Muzykantov, Vladimir R.; Ayyaswamy, Portonovo; Eckmann, David M.; Radhakrishnan, Ravi | We employ a coarse-grained model for the polymeric NP and perform Brownian dynamics simulations with hydrodynamic interactions and in presence of wall-confinement, particulate margination, and wall-adhesion for obtaining NP microstructure, shape, and anisotropic and inhomogeneous transport properties for different NP stiffness. | Session 1: 3D Printing of Polymers and Soft Materials |
| 20 | Active Microrheology, Hall Effect, and Jamming in Active Chiral Fluids | Reichhardt, Cynthia; Reichhardt, Charles | We examine the motion of a probe particle driven through an active chiral fluid composed of circularly swimming disks. | Session 2: Active Colloids |
| 21 | Hydrodynamic Spin Lattices | Saenz, Pedro; Pucci, Giuseppe; Turton, Sam; Rosales, Ruben; Dunkel, Jorn; Bush, John | In this talk, we introduce hydrodynamic spin lattices (HSLs) of walking droplets as a new class of highly tunable active spin analog systems. | Session 2: Active Colloids |
| 22 | Emergence of multi-vortex states in swarms of active magnetic rollers | Han, Koohee; Kokot, Gašper; Glatz, Andreas; Snezhko, Alexey | We report that flocking magnetic rollers driven by a vertical a.c. magnetic field [1,2] can form long-lived multi-vortex states in an unconfined environment. | Session 2: Active Colloids |
| 23 | Controlled Self-Assembly of Vortex in Ensembles of Active Magnetic Rollers | Sokolov, Andrey; Kokot, Gašper; Snezhko, Alexey | Here we present a method for guided self-assembly of ferromagnetic rolling particles energized by a uniform AC magnetic field into a stationary vortex via magnetic interaction with an additional strongly localized magnetic field. | Session 2: Active Colloids |
| 24 | Self-phoretic helical colloids | Uspal, William; Poehnl, Ruben | Via numerical calculations and slender body theory, we study how the translational and rotational velocities of the particle depend on geometry and the distribution of catalytic activity over the particle surface. | Session 2: Active Colloids |
| 25 | 3D printed active starships and other nonuniaxial swimmers | Ouhajji, Samia; Kraft, Daniela | 3D printed active starships and other nonuniaxial swimmers | Session 2: Active Colloids |
| 26 | Light Programmable Locomotions of Semiconductor Nanomotors with Optically Tunable In-Phase Electric Polarization | Liang, Zexi; Teal, Daniel; Fan, Donglei (Emma) | Herein, we present our finding of a versatile working mechanism that allows instantaneous change of alignment direction and speed of semiconductor nanowires in an external electric field with simple visible-light exposure. | Session 2: Active Colloids |
| 27 | Bulk Viscosity of Dilute Gases using Nonequilibrium Molecular Dynamics Simulations | Sharma, Bhanuday; Kumar, Rakesh | In the present work, a new method is proposed for the estimation of the bulk viscosity of dilute gases using nonequilibrium molecular dynamics simulations. | Session 2: Active Colloids |
| 28 | Floor- or ceiling-sliding for chemically active, gyrotactic, sedimenting Janus particles | Das, Sayan; Jalilvand, Zohreh; Popescu, Mihail; Uspal, William; Dietrich, Siegfried; Kretzschmar, Ilona | Here we study this issue theoretically for model gyrotactic, self-phoretic Janus spheres near horizontal planar walls which are either below ("floor") or above ("ceiling") the particle. | Session 2: Active Colloids |
| 29 | Effects of Colloid Interactions on Active–Passive Collective Behavior | Madden, Ian; Wang, LinLin; Simmchen, Juliane; Luijten, Erik | Whereas current models can capture some aspects of a system’s collective behavior, oversimplification can lead to incorrectly attributing a particular behavior to a specific interaction (The European Physical Journal E 41, 145–169 (2018)). | Session 2: Active Colloids |
| 30 | New mechanism of motility-induced phase separation in active colloids | Alert, Ricard; Zhang, Jie; Yan, Jing; Wingreen, Ned; Granick, Steve | In this talk, I will demonstrate a new mechanism of MIPS, which instead of relying on a slowdown of particle motion with density, is based on interaction torques that reorient particles toward high-density regions. | Session 2: Active Colloids |
| 31 | Extract Non-Thermal Fluctuations from an Experimentally Measured Histogram of a Confined Active Brownian Particle | Shen, Chong; Li, Lanfang; Jiang, Zhiyu; Gilchrist, James; Ou-Yang, H Daniel | This presentation reports an experimental study using a model ABP in a quadratic potential well to test the hypothesis and its limitations. | Session 2: Active Colloids |
| 32 | Transport phenomena and Green-Kubo relations in active media: Theory | Epstein, Jeffrey; Mandadapu, Kranthi | We derive Green-Kubo relations for the several viscosity terms that appear in a constitutive theory of viscous active fluids with and without an internal spin degree of freedom, starting from an Onsager regression hypothesis on the non-equilibrium steady state. | Session 2: Active Colloids |
| 33 | Transport phenomena and Green-Kubo relations in active media: Simulation | Hargus, Cory; Klymko, Katherine; Epstein, Jeffrey; Mandadapu, Kranthi | We demonstrate agreement between viscosity coefficients obtained from Green-Kubo relations and non-equilibrium molecular dynamics simulations with imposed shear. | Session 2: Active Colloids |
| 34 | Nonlinear dynamics of chemically active microdrops grants an insight into interfacial chemistry | Morozov, Matvey; Rongy, Laurence; Brau, Fabian | Active emulsions are complex physicochemical systems that may provide a model for biological phenomena such as RNA polymerase clusters. | Session 2: Active Colloids |
| 35 | Revisiting the equation of state of active Brownian particles | Mallory, Stewart; Omar, Ahmad; Brady, John | Using a combination of large-scale simulation and analytical theory, we reveal previously unknown features of this equation of state. | Session 2: Active Colloids |
| 36 | Three-body problem for Brownian particles at different temperatures | Wang, Michael; Grosberg, Alexander | This model was previously studied analytically up to the second virial coefficients using pair distributions in the dilute limit. | Session 2: Active Colloids |
| 37 | Microscopic Origins of the Swim Pressure and the Anomalous Surface Tension of Active Matter | Omar, Ahmad; Wang, Zhen-Gang; Brady, John | We clarify the utility of the swim pressure as an “equivalent pressure" (analogous to those defined from electrostatic and gravitational body forces) and the conditions in which this concept can be appropriately applied. | Session 2: Active Colloids |
| 38 | Clogging and Depinning of Active Matter Systems in Disordered Media | Reichhardt, Cynthia | We numerically examine the transport of active run-and-tumble particles with steric particle-particle interactions driven with a drift force over random disordered landscapes comprised of fixed obstacles. | Session 3: Active Matter in Complex Environments |
| 39 | Flocking through disorder | Chardac, Amélie; Shankar, Suraj; Marchetti, M Cristina; Bartolo, Denis | I will present a series of quantitative experiments that elucidate the existence of a novel state of active matter that supports orientational order (through a sparse rivers network) but no net transport. | Session 3: Active Matter in Complex Environments |
| 40 | Enhanced bacterial motility in colloidal media | Kamdar, Shashank; Francis, Lorraine; Cheng, Xiang | Using confocal microscopy, we image the motion of fluorescent-labeled bacteria and implement an in-house tracking algorithm to obtain the speeds of bacteria. | Session 3: Active Matter in Complex Environments |
| 41 | Theoretical Framework to Describe Traveling Waves of Bacteria in Porous Media | Amchin, Daniel; Bhattacharjee, Tapomoy; Kratz, Felix; Ott, Jenna; Datta, Sujit | To address this gap in knowledge, we use confocal microscopy to directly track bacteria deep inside transparent porous media. | Session 3: Active Matter in Complex Environments |
| 42 | The role of diversity for collective bacterial migration through diverse environments | Mattingly, Henry; Emonet, Thierry | We recently showed that diverse cells can travel together in the expanding front by sorting themselves by chemotactic ability, which compensates for their differences by matching ability to the local chemotactic signal (Fu, Kato et al. | Session 3: Active Matter in Complex Environments |
| 43 | Light-Sensing Microbes in Complex Geometries: Surface Adhesion, Gliding Motility and Self-Organization | Fragkopoulos, Alexandros; Till, Sebastian; Raum, Sebastian; Catalan, Rodrigo; Baeumchen, Oliver | Based on cell tracking and statistical analysis, we study the surface adsorption and gliding motility of light-sensing microbes and demonstrate how surface gliding, in conjunction with cell-cell interactions, may control the emergence of microbial self-organization in confinement. | Session 3: Active Matter in Complex Environments |
| 44 | Active Brownian filaments: deviations from blob scaling theory and dynamics inside cavities | Das, Shibananda; Cacciuto, Angelo | Via a numerical study we establish how the standard blob scaling theory representations of a polymer breaks down when dealing with active polymers under confinement. | Session 3: Active Matter in Complex Environments |
| 45 | Fitness of cell colonies to navigate obstacles | Li, Bo; Yu, Sun-Min; Cho, Yoon-Kyoung; Granick, Steve | Stretched leader cells trigger acceleration of the whole group; the resulting velocity difference, in turn, reinforces stretching of the leaders and establishes positive feedback between cell morphology and mechanical strength, as we confirm by direct visualization of F-actin expression, cadherin localization, and the shapes of cells and their nuclei. | Session 3: Active Matter in Complex Environments |
| 46 | Anomalous size-dependence of bacterial diffusion in a micropillar array | Chopra, Pooja; Quint, David; Gopinathan, Ajay; Liu, Bin | We develop an agent-based model that purely relies on the geometry of the micropillars, bacteria and residency time. | Session 3: Active Matter in Complex Environments |
| 47 | Colloidal random-walkers for probing anomalous diffusion in heterogeneous micro-environments | Karani, Hamid Reza; Kokot, Gašper; Vlahovska, Petia | Building on our recently developed tunable colloidal random walker, we combine microfluidics experiments with theory to characterize and quantify the degree of anomalous diffusion. | Session 3: Active Matter in Complex Environments |
| 48 | Transport properties of circle microswimmers in heterogeneous media | Chepizhko, Oleksandr; Franosch, Thomas | Here, we investigate a model for a single circle swimmer exploring a two-dimensional disordered array of impenetrable obstacles. | Session 3: Active Matter in Complex Environments |
| 49 | Escape of a Nanoparticle from Cavities in a Porous Matrix | Wu, Haichao; Greydanus, Benjamin; Schwartz, Daniel | Here, we used a three-dimensional (3D) tracking method to explicitly visualize the process of passive Brownian nanoparticle and self-propelled Janus particle diffusion within periodic porous nanostructures. | Session 3: Active Matter in Complex Environments |
| 50 | The Physics of Cold Active Matter: on how time-independent disorder affects the motion of self-propelled particles | Peruani, Fernando | Despite this, most experimental and theoretical efforts have focused on homogeneous media and the impact of environmental heterogeneities on individual and collective properties of active systems has remained, up to recently, unexplored. | Session 3: Active Matter in Complex Environments |
| 51 | The motion of active colloids and their induced flow field at fluid interfaces | Molaei, Mehdi; Chisholm, Nicholas; Deng, Jiayi; Yao, Tianyi; Crocker, John; Stebe, Kathleen | We consider an ideal flat "clean" interface characterized solely by a uniform interfacial tension. | Session 3: Active Matter in Complex Environments |
| 52 | Hydrodynamic attraction of bacteria to gas and liquid interfaces | Ahmadzadegan, Adib; WANG, Shiyan; Vlachos, Pavlos; Ardekani, Arezoo | We develop a new theory based on Brownian dynamics including hydrodynamics and short-range physio-chemical interactions between bacteria and surfactant-laden interfaces and explain our experimental findings. | Session 3: Active Matter in Complex Environments |
| 53 | Non-Markovian active droplets | IZZET, Adrien; Zakine, Ruben; Vanden-Eijnden, Eric; Brujic, Jasna | Here we show that the trajectories of larger droplets display complex non-Markovian behaviors, such as self-interacting dynamics, that require a more complicated model than rotational diffusion. | Session 3: Active Matter in Complex Environments |
| 54 | Stigmergy in active furrowers | Imaran, MD; Prabhakar, Ranganathan; Chelakkot, Raghunath; Inamdar, Mandar | We attempt to explain our observations through a coarse-grained, but general, model of stigmergy. | Session 3: Active Matter in Complex Environments |
| 55 | Slip and distance effects on the self-propulsion of catalytic microswimmers close to a wall | Ketzetzi, Stefania; de Graaf, Joost; Doherty, Rachel; Kraft, Daniela | In this talk, we will present quantitative measurements of the effect of the substrate on the velocity of Pt-coated model microswimmers. | Session 3: Active Matter in Complex Environments |
| 56 | Measuring chaotic advection in a biological active nematic in viscous environments | Tan, Amanda; Mitchell, Kevin; Hirst, Linda | We investigate how the external changes from viscosity affect various quantitative parameters from chaotic advection theory, such as local fluid stretching rates within the network and topological entropy calculated from defect braiding. | Session 3: Active Matter in Complex Environments |
| 57 | Hydrodynamic interactions between passive colloids in an active bacterial bath | Gokhale, Shreyas; Li, Junang; Solon, Alexandre; Gore, Jeffrey; Fakhri, Nikta | By quantifying spatial velocity correlations and the short time pair diffusivity tensor for colloids, we show that bacterial motion leads to partial screening of long-ranged hydrodynamic interactions. | Session 3: Active Matter in Complex Environments |
| 58 | Self-organization of swimmers drives long-range fluid transport in bacterial colonies | Haoran, Xu; Dauparas, Justas; Das, Debasish; Lauga, Eric; Wu, Yilin | Here, we show that motile cells in sessile colonies of peritrichously flagellated bacteria can self-organize into two adjacent, centimeter-scale motile rings surrounding the entire colony. | Session 3: Active Matter in Complex Environments |
| 59 | Linear instability and nonlinear dynamics of droplets and layers of active fluid | Stein, David; Young, Yuan-nan; Shelley, Michael | In this work we focus on the effects of surface tension on the stability and nonlinear dynamics in droplets and layers of active fluid. | Session 3: Active Matter in Complex Environments |
| 60 | Swimming of active drops in confinements with external flows | Dey, Ranabir; Buness, Carola M.; Jin, Chenyu; Maass, Corinna | We feel that understanding such swimming behaviour of active matter will make significant contribution towards better comprehension of certain important biological phenomena. | Session 3: Active Matter in Complex Environments |
| 61 | Examining collective mechanical properties of fish schools using projected light fields | Puckett, James; Pokhrel, Aawaz | Models have shown that simple local interactions between individuals gives rise to the emergent self-organized macroscopic states such as flocks, swarms, or schools. | Session 3: Active Matter in Complex Environments |
| 62 | Spatial-temporal organization of bacterial suspensions under confinement | Aronson, Igor | We present experimental and theoretical studies on the expansion of highly concentrated bacterial droplets into an ambient bacteria-free fluid. | Session 3: Active Matter in Complex Environments |
| 63 | Trapping of microswimmers in vortex flows | Berman, Simon; Mitchell, Kevin | We propose heteroclinic bifurcations between swimming fixed points as a general mechanism for the creation of stable swimmer trajectories. | Session 3: Active Matter in Complex Environments |
| 64 | Sensorimotor processing and navigation in confined microswimmers | Bentley, Samuel; Anagnostidis, Vasileios; Gielen, Fabrice; Wan, Kirsty | We present a novel microfluidic platform which allowed us for the first time to monitor and analyse algal cell motility over hours, and even developmental timescales. | Session 3: Active Matter in Complex Environments |
| 65 | Topographical guidance of highly-motile cells using cell-sized features | Wondergem, Joeri; Schakenraad, Koen; Witzel, Patrick; Mytiliniou, Maria; Holcman, David; Heinrich, Doris | Here, we focused on a larger scale, and studied the influence of cell-sized obstacles on highly-motile, persistent cell migration. | Session 3: Active Matter in Complex Environments |
| 66 | Quenching active matter using light: Light mediated motility in swarming Serratia marcescens | Gopinath, Arvind; Yang, Junyi; Patteson, Alison; Arratia, Paulo | Complementing our experimental results, we propose and analyze a minimal Brownian dynamics model to study the escape of bacteria from the exposed region before they are completely immobilized and trapped. | Session 3: Active Matter in Complex Environments |
| 67 | Submerged micro-strucutures generate a soft boundary effect on active nematic flows | Khaladj, Dimitrius; Tan, Amanda; Hirst, Linda | We study the behavior of an active nematic microtubule system confined by submerged complex geometries. | Session 3: Active Matter in Complex Environments |
| 68 | Lattices by design: exploring long-ranged interactions with gradient sensing droplets | Molina, Anton; Prakash, Manu; Kumar, Shailabh | Here, we develop exotic lattice systems that exploit the tools of photolithography to fabricate arbitrary patterns of hydrophobic boundaries, enabling us to experimentally manipulate the geometry in which long-ranged degrees of freedom interact. | Session 3: Active Matter in Complex Environments |
| 69 | Arresting Active Spinning Particle Coarsening in Passive Media via Actuation Protocols | Steimel, Joshua; Tollefsen, Ryan; Alexander-Katz, Alfredo | We present a novel approach which allows the control of coarsening behavior and resultant characteristic domain size via modulation of the activity actuation protocol. | Session 3: Active Matter in Complex Environments |
| 70 | Flocking Transition in a Self-propelled Particle Model Using Experimental Motility Conditions | Lyles, Jelani; Yanka, Paul; Tung, Chih Kuan; Sussman, Daniel; Manning, M. Lisa | Flocking transition has been studied using self-propelled particle models for decades. | Session 3: Active Matter in Complex Environments |
| 71 | Re-entrant self pumping in confined active fluids | Varghese, Minu; Baskaran, Arvind; Hagan, Michael; Baskaran, Aparna | In this talk, I will discuss the origin of this phenomenon using an active hydrodynamic theory. | Session 3: Active Matter in Complex Environments |
| 72 | Tunable self-organization of swimming magnetic bacterial suspensions | Wijesinghe, Hiran; Pierce, Christopher; Mumper, Eric; Lower, Brian; Lower, Steven; Sooryakumar, Ratnasingham | We present population-level self-organization in a flagellated magnetic bacterial suspension of Magnetospirillum magneticum (AMB-1) that is amenable to experimental control using programmable fields. | Session 3: Active Matter in Complex Environments |
| 73 | Dynamics of 2D Active Nematics Confined in an Annulus | Joshi, Chaitanya; Zarei, Zahra; Norton, Michael; Fraden, Seth; Baskaran, Aparna; Hagan, Michael | In this talk, we will discuss a theoretical and computational study of 2D active nematics confined to an annulus. | Session 3: Active Matter in Complex Environments |
| 74 | Self-organization of bacterial active matter in space and time | Liu, Song; Wu, Yilin | Here we found that tuning the rheological properties of bacterial active fluids enables large-scale spatial and temporal self-organization. | Session 3: Active Matter in Complex Environments |
| 75 | Nonequilibrium phases in mixtures of active and passive particles | Li, Junang; Gokhale, Shreyas; Solon, Alexandre; Gore, Jeffrey; Fakhri, Nikta | Here, we map the computational phase diagram of a binary mixture of active and passive particles as a function of orientational interactions and Peclet number and observe new emergent behavior of dynamical clustering and a polar band of active particles. | Session 3: Active Matter in Complex Environments |
| 76 | Tuning the self-organization of confined active particles by the steepness of the trap | Rana, Shubhashis; Samsuzzaman, Md.; Saha, Arnab | We consider the collective dynamics of self-propelling particles in two dimensions. | Session 3: Active Matter in Complex Environments |
| 77 | Active matters: broken symmetries and response | Dal Cengio, Sara; Levis, Demian; Pagonabarraga, Ignacio | We address the question of how interacting active systems in a non-equilibrium steady-state respond to an external perturbation. | Session 3: Active Matter in Complex Environments |
| 78 | Spontaneous symmetry breaking induced unidirectional rotation of a chain-grafted colloidal particle in the active bath | TIAN, WENDE | Here we show, by simulations, that a chain-grafted disk-like colloidal particle can rotate unidirectionally and hence output work when immersed in a thin film of active particle suspension. | Session 3: Active Matter in Complex Environments |
| 79 | Temperature dependence of microtubule-based active fluid | Bate, Teagan; Jarvis, Edward; Varney, Megan; Wu, Kun-Ta | This temperature-dependent speed was reported to follow the Arrhenius Law. | Session 3: Active Matter in Complex Environments |
| 80 | Elasticity mediated attraction between active polar particles | Gupta, Rahul; Kant, Raushan; Soni, Harsh; Sood, Ajay; Ramaswamy, Sriram | We present a theory for this active attraction based on the forcing imposed by the motile rods on the crystalline medium of beads, and the action of the medium on the rod orientation. | Session 3: Active Matter in Complex Environments |
| 81 | Light-regulated swimming motility induces cell aggregation in confinement | Fragkopoulos, Alexandros; Vachier, Jérémy; Frey, Johannes; Le Menn, Flora-Maud; Wilczek, Michael; Mazza, Marco; Baeumchen, Oliver | We observe that a suspension of freely swimming C hlamydomonas reinhardtii cells, a unicellular soil-dwelling microalgae and a model organism of puller-type microswimmers, forms such large-scale aggregations under confinement in specific light conditions. | Session 3: Active Matter in Complex Environments |
| 82 | Undulatory intruder dynamics in water-saturated granular beds | Kudrolli, Arshad; Huynh, Trinh | We will report an investigation of active intruder dynamics through complex media with {\texit Lumbriculus variegatus} moving through water saturated granular beds which are refractive index matched to enable observation of their motion inside the bed. | Session 3: Active Matter in Complex Environments |
| 83 | Pressure of bacterial suspensions on confining walls and freely moving chains | Ma, Xiaolei; Guo, Shuo; Xu, Xinliang; Cheng, Xiang | In particular, mechanical pressure, a state variable in equilibrium systems, shows a nontrivial dependence on system boundary as well as specific measurement methods. | Session 3: Active Matter in Complex Environments |
| 84 | Active surfers on a vibrating bath: self-propulsion and interactions | Oza, Anand; Ho, Ian; Pucci, Giuseppe; Harris, Daniel | We present a combined experimental and theoretical investigation of a newly discovered active matter system consisting of objects floating on a vertically vibrating fluid bath. | Session 3: Active Matter in Complex Environments |
| 85 | Nutrient depletion thresholds in 3D printed cell assemblies | Morley, Cameron; Angelini, Thomas | In this talk, we will describe experiments that test the 200 micron rule in which we 3D print controlled distributions of hepatocytes into 3D culture medium made from jammed granular microgels. | Session 3: Active Matter in Complex Environments |
| 86 | Control of Active Nematics through Friction | Thijssen, Kristian; Metselaar, Luuk; Shendruk, Tyler; Doostmohammadi, Amin; Yeomans, Julia | Our work demonstrates novel methods to control active matter without the introduction of invasive solid bounding walls. | Session 3: Active Matter in Complex Environments |
| 87 | Inertial effects on trapped active matter | Sandoval-Espinoza, Mario; Gutierrez, Lorenzo | Here, we analytically find the effect of inertia on the mean-square displacement and mean-square speed of a system of inertial active Brownian particles subject to a weak and a strong harmonic trap. | Session 3: Active Matter in Complex Environments |
| 88 | Wiggling arthropods induce flow in granular materials | Kendall, Melia; Chen, Shih-Yuan; Daniels, Karen | Just as heating a viscous fluid causes its viscosity to drop, we observe that the introduction of active particles into a passive granular material can increase its flowability. | Session 3: Active Matter in Complex Environments |
| 89 | Multicanonical Studies of Fluid Behavior | Yevick, David; Tong, Ming | We applied the multicanonical procedure to the nonlinear Schrodinger equation in order to generate the probability distribution function (pdf) of rogue wave heights in the region of extremely small probabilities. | Session 4: Computational Fluid Dynamics |
| 90 | Rotating Cylinder as a Flow Split Controller in a Rectangular T-channel: Power-Law Fluids | Maurya, Anamika; Tiwari, Naveen; Chhabra, R.P. | Rotating Cylinder as a Flow Split Controller in a Rectangular T-channel: Power-Law Fluids | Session 4: Computational Fluid Dynamics |
| 91 | Scale resolving simulations of flow past a heated sphere using non-linear eddy viscosity closure | SAROHA, SAGAR; Chakraborty, Krishnendu; Sinha, Sawan; Lakshmipathy, Sunil | In this talk these results along with some pertinent explanations and insights will be presented. | Session 4: Computational Fluid Dynamics |
| 92 | Lattice Boltzmann Simulations of Magnetohydrodynamic Flows on a Rectangular Grid using a Central Moments Formulation | Yahia, Eman; Premnath, Kannan | Here, we extend a prior LBM formulation for MHD, which was constructed for square grids, to handle rectangular lattice grids. | Session 4: Computational Fluid Dynamics |
| 93 | Data-driven A priori analysis of sub-grid scale stress closures | Prakash, Aviral; Jansen, Kenneth; Evans, John | We present an A priori study conducted on the homogeneous isotropic turbulence to determine a model for modeling sub-grid scale stress tensor and compare it with common gradient-viscosity hypothesis based models. | Session 4: Computational Fluid Dynamics |
| 94 | Adaptive time-step selection in volume of fluid (VOF) simulations | Davanlou, Ashkan | Therefore, we implemented a CFL based time-step control that can target a given area such as the cells intersecting the free surface, such that the CFL limit can be imposed where it is needed. | Session 4: Computational Fluid Dynamics |
| 95 | Control of Unstart Phenomenon in a Hydrogen Fuelled Scramjet model | VARSHNEY, ANCHAL; Varshney, Mehul; Baig, MF | Control of Unstart Phenomenon in a Hydrogen Fuelled Scramjet model | Session 4: Computational Fluid Dynamics |
| 96 | Experimental & CFD Analysis, Design & Optimisation of the Cooling System of a Formula Student Racecar | Mittal, Ayush; VARSHNEY, ANCHAL; Varshney, Mehul | Experimental & CFD Analysis, Design & Optimisation of the Cooling System of a Formula Student Racecar | Session 4: Computational Fluid Dynamics |
| 97 | Flow dynamics in an aneurysm: Effect of prolonged exercise | Varshney, Mehul; Usmani, Abdullah | Flow dynamics in an aneurysm: Effect of prolonged exercise | Session 4: Computational Fluid Dynamics |
| 98 | Nucleation in Granular Media Undergoing Cyclic Shear | Jin, Weiwei; O’Hern, Corey; Radin, Charles; Shattuck, Mark; Swinney, Harry | In this work, we carry out discrete element method simulations to determine the contributions of friction and gravity to crystallization of granular materials during cyclic shear. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 99 | Structural and Mechanical Characteristics of the Disorded-Ordered Transition in Mechanically Stable Sphere Packings | Mizuno, Hideyuki; Saitoh, Kuniyasu; Silbert, Leo | Using the discrete element method, we generate mechanically stable sphere packings in three dimensions that span a wide range in structural order, ranging from fully amorphous through to (quasi) ordered structures, as characterized by the globally averaged bond orientational order parameter. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 100 | Isostatic, ordered disk packings | Tuckman, Philip; VanderWerf, Kyle; Shattuck, Mark; O’Hern, Corey | In this work, we show that isostatic, ordered jammed packings of nearly monodisperse disks also occur over a range of packing fractions, φ O, min < φ J < φ xtal, where φ xtal ≈ 0.907 is the packing fraction for a triangular lattice. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 101 | Athermal fluctuations in disordered crystals | Acharya, Pappu; Sengupta, Surajit; Chakraborty, Bulbul; Ramola, Kabir | We analyze the fluctuations in particle positions and inter-particle forces in disordered jammed crystals in the limit of the weak disorder. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 102 | Mechanically stable sphere packings at arbitrarily low densities | Dennis, Robert; Corwin, Eric | The previously known lowest density packings are constructed by diluting simple crystals, but we present a new construction based on rigid bridges. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 103 | Real-space renormalization of randomly vacated lattices: a renormalization group for jamming? | Clark, Abe | Here, I present a candidate for such a scheme, using a block-spin-like transformation of a randomly vacated lattice of grains. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 104 | Critical scaling for yield is independent of distance to isostaticity | Thompson, Jacob; Clark, Abe | Here, using simulations of quasi-statically sheared soft sphere packings, we observe critical behavior near μ=μc, with a diverging length scale ξ ~ | μ – μ c | -ν, that is independent of distance to isostaticity over a wide range of p. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 105 | The Influence of the Wall on Confined Random Packing of Rods | Jiang, Jason; Freeman, Julian; Weeks, Eric | In this current work, we coat the inner vertical surface of the containers with sandpaper to change the enhance friction between the wall and the rods. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 106 | Two-stage jamming in semiflexible polymers and fibers | Dietz, Joseph Fox; Hoy, Robert | We find that jamming in model freely rotating polymers with bond angle θ 0 occurs in two stages. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 107 | Low frequency vibrations of deformable particles | Wang, Dong; Boromand, Arman; Murrell, Michael; Shattuck, Mark; O’Hern, Corey | In this work, we calculate the spectrum of vibrational modes from the eigenvalues of the dynamical matrix for truly deformable particles at jamming onset as a function of the shape parameter A = p2/(4πa), where p is the perimeter and a is the area of the particle. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 108 | Structure and dynamics during training of memory in jammed packings | Graham, Ian; Liu, Andrea | We use persistent homology to characterize the structure. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 109 | Measuring the Granular Density of Modes in 3D via Impact | Owens, Eli; Blue, Sydney; Wright, Salem | In this work, we present an experimental method for acoustically measuring the granular density of modes using a single impact event to excite vibrational modes in the granular material. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 110 | Quenching to field-stabilized magnetization plateaus in the unfrustrated Ising antiferromagnet | Iaizzi, Adam; Kao, Ying-Jer | We study the square-lattice Ising antiferromagnet in a uniform field using single spin flip Metropolis algorithm dynamics. | Session 5: Crystallization, Jamming, and Glassy Behavior |
| 111 | Microfluidics platform for generation of microparticles and capsules through Electrohydrodynamics | Eqbal, Danish; Gundabala, Venkat | In this work we present a microfluidics based implementation of electrohydrodynamics for generation microparticles and capsules. | Session 6: Drop |
| 112 | Numerical Modeling of In-Situ Curing of a Photopolymerizing and Spreading Drop with Applications in 3D-Printing | Das, Siddhartha; Sivasankar, Vishal; Sachar, Harnoor; Sinha, Shayandev; Hines, Daniel | In this study, we investigate the spreading behavior of a polymer drop in conditions similar to that of the Aerosol Jet Printing (AJP) process. | Session 6: Drop |
| 113 | A Comparative Study of the Pattern Formation in the Drying Protein Droplets suspended in the De-ionized water | Pal, Anusuya; Iannacchione, Germano | A Comparative Study of the Pattern Formation in the Drying Protein Droplets suspended in the De-ionized water | Session 6: Drop |
| 114 | Flow of Emulsions with Insoluble Surfactant through Porous Media | Gissinger, Jacob; Zinchenko, Alexander; Davis, Robert | A pressure-driven, concentrated emulsion flowing through a packed bed of spheres is modeled using a three-dimensional boundary-integral algorithm. | Session 6: Drop |
| 115 | Surface roughness control of water-air dynamic contact angle hysteresis on metal substrates | Machado de Oliveira, Marina; Murphy, Joseph; Ackerman, John; Rice, WIlliam; Alvarado, Vladimir | In this work, we focus on water-air contact angle hysteresis on metal substrates of interest, e.g. aluminum, using a pendant-drop system over a frequency range 0.1-10 Hz. | Session 6: Drop |
| 116 | Modeling of hydrophobic particle capture by expanding droplets | Roure, Gesse; Davis, Robert | The method of froth flotation by small air bubbles has been traditionally used in industry to capture fine minerals and other hydrophobic particles. | Session 6: Drop |
| 117 | Experiments in liquid-spray physics | Lapham, Gary; McHugh, John | Experiments in liquid-spray physics | Session 6: Drop |
| 118 | The Cheerios Effect under a thin elastic film | Lee, Carmen; Buller, Abigail; Dalnoki-Veress, Kari | We examine the effect of the thin film on the equilibrium position of the bubble as well as the attractive force between the two bubbles and present a theoretical model. | Session 6: Drop |
| 119 | Stability limit of electrified droplets and bubbles | Beroz, Justin; Hart, John; Bush, John | In this talk, we demonstrate, experimentally and theoretically, that the stability limit of a conducting droplet exposed to an external electric field is described by a power law with broad generality that applies to the cases in which the droplet is pinned or sliding on a conducting surface or free floating. | Session 6: Drop |
| 120 | Superpropulsion of liquid droplets in sharpshooter insects | Challita, Elio; Acharya, Raghav; Krugner, Rodrigo; Bhamla, Saad | Unlike the take-off speed of a rigid projectile that is set by maximum speed of the launching spring, we find that the elastic liquid droplets in sharpshooters can achieve take-off velocities that are up 3X faster than the underlying spring. | Session 6: Drop |
| 121 | Intricate instabilities in drying drops | Arora, Srishti; Driscoll, Michelle | Here, we present a study of the drying of a high-volume fraction suspension drop. | Session 7: Drops |
| 122 | Droplet traffic in microfluidic networks: Role of droplet collisions and occlusion | Norouzi Darabad, Masoud; Vanapalli, Siva; Vaughn, Mark | We study droplet decision rules by use of droplet trajectories and distribution of the droplets in the junction and throughout the network. | Session 7: Drops |
| 123 | Joint effect of advection, diffusion, and capillary attraction on the spatial structure of particle depositions from evaporating droplets | Kolegov, Konstantin; Barash, Lev | A simplified model is developed, which allows us to perform computer simulations of the particles transport in an evaporating droplet with a contact line pinned to a hydrophilic substrate. | Session 7: Drops |
| 124 | Dynamics and stability of confined levitating droplets | Thomson, Stuart; Durey, Matthew; Bush, John; Rosales, Ruben | When confined to an annular ring, we show that single droplets are observed to exhibit a random walk like behaviour, while the collective dynamics of one-dimensional droplet lattices exhibit canonical features of driven dissipative oscillator systems, namely out-of-phase oscillations and solitary wave propagation. | Session 7: Drops |
| 125 | Watching Droplets Dry in Wet and Dry Climates | Lilin, Paul; Bourrianne, Philippe; Bischofberger, Irmgard | We discuss the relation between these changes in structure and kinetics and the deposit thickness. | Session 7: Drops |
| 126 | How air deforms the free surface just before disk impact on a liquid bath | Van Der Meer, Devaraj; Jain, Utkarsh; Gauthier, Anaïs; Lohse, Detlef | We show that, whereas the manner in which the surface below the center of the disk is pushed down is consistent with potential theory, this is not the case for the elevation of the free surface below the disk’s edge. | Session 7: Drops |
| 127 | Dispersion of magnetic beads in flowing droplets. | Brouzes, Eric; Lammertse, Evan | We have demonstrated a proof-of-principle of magnetic purification from flowing droplets using an external magnetic field to partition beads within droplets before asymmetric splitting. | Session 7: Drops |
| 128 | Computational modeling of droplet spreading and coalescence on fiber rails | Wang, Fang; Schiller, Ulf | In this talk, we will present lattice Boltzmann simulations of droplet spreading on fiber rails. | Session 7: Drops |
| 129 | Spreading and evaporation of sessile droplets | Lindeman, Chloe; Schade, Nicholas; Nagel, Sidney | Spreading and evaporation of sessile droplets | Session 7: Drops |
| 130 | Electric Discharge Mediated Transient Interfacial Dynamics of a Sessile Liquid Droplet: Plethora of Hydrodynamic Features | Sarma, Bhaskarjyoti; Kumar, Sunny; Dalal, Amaresh; Basu, Dipankar; Bandyopadhyay, Dipankar | We experimentally demonstrate a plethora of hydrodynamic features namely jetting, crowning, and bursting, engendered from capturing electrical discharge inside a sessile liquid droplet. | Session 7: Drops |
| 131 | High density ratio Lattice Boltzmann simulations of immiscible drop collision | Bala, Neeru; Kusumaatmaja, Halim; Semprebon, Ciro | In this contribution, I will present a numerical investigation of the collision between two immiscible droplets by employing a high density ratio (~10 3) Free energy Lattice Boltzmann model, which account for the Inertial effects [1]. | Session 7: Drops |
| 132 | Control and characterization of thin film formation by electrospray deposition techniques | Toth, Kristof; Doerk, Gregory; Yager, Kevin; Osuji, Chinedum | We describe a simple feedback control for visual analysis of various electrospray modes and their corresponding film formation. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 133 | Morphological Control of Multifunctional Melting Gel Coatings via Electrospray Deposition | Gamboa, Arielle Marie; Lei, Lin; Mercado, James; Guzman, Jennifer; Klein, Lisa; Jitianu, Andrei; Singer, Jonathan | Morphological Control of Multifunctional Melting Gel Coatings via Electrospray Deposition | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 134 | Using Multiplexed Electrosprays to Manipulate Fluids and (Soft) Materials | Gomez, Alessandro | Using fluid mechanics and electrostatics, we a) developed criteria for compact multiplexing to increase flow rate drastically, b) microfabricated systems with high packing densities (1.1 104 sources/cm2), reducing the cost per electrospray source, and c) demonstrated successful operation of these devices in the synthesis of (soft) materials (e.g., polymer nanoparticles of controlled shape for drug delivery and battery materials) and in microchip cooling. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 135 | Self-Limiting Electrospray Deposition for the Surface Modification of Additively Manufactured Parts | Kovacevich, Dylan; Lei, Lin; Han, Daehoon; Kuznetsova, Christianna; Kooi, Steven; Lee, Howon; Singer, Jonathan | Having demonstrated three-dimensional coating with film thickness in the range of 1-50 µm on a variety of conductive objects, in this study we employed model substrates and finite element method simulations to quantitatively study the technique’s limits with regard to geometry and scale. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 136 | The Role of Surface Charging in Electrospray Printing of Thin Films | Zhu, Yaqun; Chiarot, Paul | We report on the use of electrospray printing to create thin continuous multiscale films from nanoparticle aggregates. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 137 | Effect of Processing Conditions on the Formation and Microstructure of Electrospray Printed Polymer Films | Kingsley, Bryce; Chiarot, Paul | We report on the use of electrospray to print thin films of polytetrafluoroethylene (PTFE) on silicon substrates. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 138 | Electrospray deposition of nanowire forests through spinodal gellation | Lei, Lin; Nachtigal, Catherine; Chen, Shensheng; Moy, Tyler; Yong, Xin; Singer, Jonathan | Such a morphology has yet to be observed experimentally, which we propose is the result of spatially-varying viscosity in sprayed droplets. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 139 | Modelling Nanowire Formation in Electrospray Deposition of Polymeric Droplets | Chen, Shensheng; Yong, Xin | We conducted computer simulations to uncover the physics underpinning the morphological evolution of a highly charged polymeric droplets in ESD. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 140 | Influence of ionic conductivity on unconfined melt electrospinning of thermoplastics | Sheoran, Neelam; Boland, Brenton; Shabani, Elnaz; Gorga, Russell; Bochinski, Jason; Clarke, Laura | I will report ionic conductivity measurements obtained using broad-band impedance spectroscopy for two different grades of commercial linear low-density polyethylene with varying viscosities as a function of melt temperature and additive concentration. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 141 | Unconfined melt electrospinning from molten polymer experiencing an electric discharge to manipulate ion density and ionic conductivity | Boland, Brenton; Sheoran, Neelam; Clarke, Laura; Bochinski, Jason | We utilize an unconfined geometry where jets spontaneously form and organize on the edge of a melt-covered plate under the influence of the applied electrospinning electric field. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 142 | Liquid Selection for Electrohydrodynamic Capillary Thermal Switches | Ma, Tianxing; Dsouza, Darrel; Ryerson, Kyrsten McKenzie; Signorelli, Matthew; Zhao, Yang; Osuji, Chinedum; Singer, Jonathan | The deformation of sessile droplets and capillary bridging in a parallel-plate capacitor under DC field has been the subject of several scientific studies. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 143 | Dielectric modulation of two-dimensional dipolar materials | Wang, Ziwei; Luijten, Erik | We demonstrate that in dipolar films, a prototypical system for pattern formation, patterns can be induced by dielectric effects alone [1]. | Session 8: Electrostatic Manipulation of Fluids and Soft Matter: Electrohydrodynamics |
| 144 | Precision measurement of tribocharging in acoustically levitated sub-millimeter grains | Kline, Adam; Lim, Melody; Jaeger, Heinrich | In this talk, we present a new experimental method [1], extending a prior approach [2] based on acoustic levitation, which allows us to controllably and repeatedly collide two sub-millimeter grains head-on and measure the evolution of their electric charges. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 145 | Tuning friction and slip at solid-nanoparticle suspension interfaces by electric fields. | Seed, Caitlin; Acharya, Biplav; Brenner, Donald; Smirnov, Alex; Krim, Jacqueline | We report an experimental Quartz Crystal Microbalance (QCM) study of tuning interfacial friction and slip lengths for aqueous suspensions of ceramic (Al 2O 3, TiO 2 and SiO 2) nanoparticles on planar platinum surfaces by external electric fields. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 146 | Particle assembly using confined electro-hydrodynamics: Driven versus active assembly | Fossum, Jon Otto; Dommersnes, Paul | We give examples of driven colloidal shell assembly on drop interfaces by application of DC-electrohydrodynamics and dielectrophoresis, using standard leaky dielectric carrier fluids for non-polarisable and/or polarizable colloids. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 147 | Electrostatic patterns from peeling tape | Reiter, Mary; VanDusen-Gross, Matthew; Shinbrot, Troy | In this talk, we discuss new and surprising aspects of triboelectric charging associated with tape peeling including entirely different charge patterns on formerly adjoining surfaces. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 148 | Sublattice Melting in Binary Superionic Colloidal Crystals | Lin, Yange; Olvera De La Cruz, Monica | Sublattice Melting in Binary Superionic Colloidal Crystals | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 149 | Band-collision gel electrophoresis (BCGE) for visualizing molecular and colloidal interactions | Bikos, Dimitri; Mason, Thomas | Band-collision gel electrophoresis (BCGE) for visualizing molecular and colloidal interactions | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 150 | Controlling surfactant self-assembly in dodecane via applied potential | Vuorte, Maisa; Lokka, Aapo; Sammalkorpi, Maria | Here, we present a molecular modelling study of the aggregation of dioctyl sodium sulfosuccinate (AOT) surfactant in apolar dodecane solvent under applied potential. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 151 | Dumbbell model for the simulation of polyelectrolytes in combination of flow and electric fields | Setaro, Angelo; Underhill, Patrick | To gain insight to the underlying phenomena, we used a combination of theoretical calculations and Brownian Dynamics simulations in order to understand the mechanism of migration and why it results in a non-monotonic trend. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 152 | Electrostatically Stabilized Microphase Separation in Polyelectrolyte Blends: Analogy to Nuclear "Pasta" Phases | Rumyantsev, Artem; De Pablo, Juan | We develop the weak segregation theory of microphase separation in stoichiometric blends of oppositely and weakly charged polyelectrolytes, which would be immiscible in the absence of charged units. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 153 | Determination of diffusion constant of antimicrobial peptide nisin interacting with Langmuir monolayers of DPPC and DPPG molecules | Pasha, Imran; Kumar, Bharat | We present a method of determining the diffusion constant of peptides interacting with lipid films. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 154 | Capture and Translocation of a Rod-like dsDNA by a Nanopore:~A Lattice Boltzmann Simulation Study | Qiao, Le; Holm, Christian; Szuttor, Kai; Slater, Gary | In this talk, we investigate this problem further using a coarse-grained (CG) model of a charged double-stranded DNA where the hydrodynamic interactions are added by coupling the CG DNA with a lattice-Boltzmann fluid via a raspberry approach. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 155 | Nontrivial effects of dielectric mismatch on the conformational behavior of confined polyelectrolytes | Nguyen, Trung; Olvera De La Cruz, Monica | We investigate the conformational behavior of a highly charged polyelectrolyte confined in a spherical cavity where the media inside and outside the cavity have different dielectric constants. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 156 | Interaction of highly charged rigid polymer in monovalent salt | Li, Yaohua; Jimenez-Angeles, Felipe; Olvera De La Cruz, Monica | Using an empirical ion potential that reproduces pair correlations from all atom molecular dynamics (MD) simulations, we study ion distributions and DNA-DNA interactions by coarse-grained MD simulations with explicit salt ions. | Session 9: Electrostatic Manipulation of Fluids and Soft Matter: Self-Assembly |
| 157 | Bistability in the Flow of Polymer Solutions in Porous Media | Browne, Christopher; Shih, Audrey; Datta, Sujit | We shed light on this question by systematically varying the spacing between pores. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 158 | Shear melting and recovery of cellulose nanocrystal-polymer gels | Rao, Abhinav; Divoux, Thibaut; McKinley, Gareth; Hart, John | Here, we study the rheological behavior of composite polymer-CNC gels in dimethylformamide, which include additives for both UV and thermal crosslinking. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 159 | Observing phase separation in colloid-polymer mixtures with a custom light-sheet rheoscope | Wang, Jing; McGorty, Ryan | We study liquid-liquid phase separation (LLPS) with a colloid-polymer system subjected to shear. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 160 | Understanding and predicting flow instabilities in self-assembled polymers | McCauley, Patrick; Kumar, Satish; Calabrese, Michelle | Despite reported shear banding in polymer WLMs (pWLMs), current research has focused on surfactant WLMs (sWLMs) or linear polymers. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 161 | Depletion Layer Dynamics of Polyelectrolyte Solutions under Poiseuille Flow | King, John; Park, Seong Jun; Shakya, Anisha | Here, we develop a novel adaptation of super-resolution microscopy based on stimulated emission depletion (STED) to directly measure depletion layer composition in real- space with 10s of nanometer resolution. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 162 | Honey bees transport pollen particles of varying shape and size by forming them into a permanent granule | Matherne, Marguerite; Puvvada, Suraj; Guy, Ben; Poon, Wilson; Hu, David | We show that most pellets do not fluidize when subjected to vibrations or when brought into contact with a similar suspension of lower volume fraction, suggesting that it is a permanent granule. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 163 | Shear thickening of dense suspensions in the limit of jamming | Madraki, Yasaman; Ovarlez, Guillaume; Hormozi, Sarah | In this work, we focus on the shear thickening phenomenon that occurs in the limit of jamming. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 164 | A new dimensionless number governing dethickening in orthogonally perturbed shear thickened suspensions | Ramaswamy, Meera; Griniasty, Itay; Shetty, Abhishek; Sethna, James; Cohen, Itai | In this talk, I show that dethickening in the regime where the primary shear flow has fully thickened the suspension, is governed by a single dimensionless parameter – the ratio of the orthogonal shear rate amplitude to that of the primary shear rate. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 165 | Connecting microscale stresses to macromolecular motion in entangled ring-linear DNA blends | Peddireddy, Karthik Reddy; Lee, Megan; Garamella, Jonathan; McGorty, Ryan; Robertson-Anderson, Rae | To elucidate the dynamics of these blends, we demonstrate a novel technique that combines optical tweezers microrheology with fluorescence imaging and differential dynamic microscopy. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 166 | Cell nucleus as a mcirorheological probe to study the rheology of the cytoskeleton | Nazockdast, Ehssan; Moradi, Moslem | We propose a novel method to decouple the mechanics of membrane and cytoskeleton, by analyzing the correlation between the membrane deformations that are induced by external microfluidic flows and nucleus displacements induced by those membrane deformations i.e. we use the nucleus as a microrheological probe to study the rheology of the interior cytoskeleton, independent of membrane rheology. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 167 | The divergence-conforming immersed boundary method: Application to vesicles, capsules, and red blood cells under flow | Casquero, Hugo; Zhang, Yongjie | In order to discretize the higher-oder derivatives that appear in vesicle and capsule formulations, we use C 2-continuous cubic B-splines with periodic knot vectors and C 1-continuous bi-cubic analysis-suitable T-splines in 2D and 3D settings, respectively. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 168 | Flow-induced microstructural rearrangement and rheological consequences for model red blood cell suspensions in microvessels | Chen, Yeng-Long; Liao, Chih-Tang | We investigated how inter-particle attraction affect cluster and particle migration in microvessels, where the near wall particle depletion layers due to hydrodynamics significantly alters fluid viscosity. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 169 | Cross-stream migration of non-spherical particles in a second-order fluid | WANG, Shiyan; Tai, Cheng-Wei; Narsimhan, Vivek | In shear driven flows, we observe that spheroidal particles adjust their orientation to align their longer axis along the vorticity direction, although significant deviations from slender body theories occur for finite aspect ratios. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 170 | Vortices in 2D Colloids | Park, Myeonggon; Li, Bo; Granick, Steve | To understand their roles in material phase states, we observed colloidal crystals comprised of Janus colloids whose anisotropic properties can be controlled. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 171 | On the mechanisms of superspreading | Theodorakis, Panagiotis; Smith, Edward; Müller, Erich; Craster, Richard; Matar, Omar | Here, we report on extensive molecular dynamics simulations of a coarse-grained model based on the SAFT force-field. | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 172 | Microfluidic flow-processing of soft matter systems | Donina, Liva; Cabral, Joao | Microfluidic flow-processing of soft matter systems | Session 10: Flow of Complex Fluids: Rheology, Structure, and Instabilities |
| 173 | Observation of broad-band water wave guiding in shallow water | Falcon, Claudio; Sepulveda, Fabián; Guzmán, Diego; Vicencio, Rodrigo | We present experimental and numerical results of this shallow water wave guiding, which can be straightforwardly matched to the one-dimensional wave equation of shallow water waves. | Session 11: Fluid Structure Interactions |
| 174 | Designing an All-Carbon Membrane for Water Desalination | Tomanek, David; Kyrylchuk, Andrii | We design an all-carbon membrane for the filtration and desalination of water. | Session 11: Fluid Structure Interactions |
| 175 | Separation and collision dynamics in biomimetic wind-driven fog harvesting | Shahrokhian, Aida; Chan, Fan Kiat; Feng, Jiansheng; Gazzola, Mattia; King, Hunter | Physical and behavioral techniques developed over eons by plants and animals in these regions can provide useful insight to do it better. | Session 11: Fluid Structure Interactions |
| 176 | Pair interaction between sedimenting polar objects in the Stokes regime | Conway, Alyssa; Menon, Narayanan; Chajwa, Rahul; Ramaswamy, Sriram | We study triangles placed in a quasi-two-dimensional container and sedimented at low Reynolds number as a model of the stokesian sedimentation of polar objects. | Session 11: Fluid Structure Interactions |
| 177 | Sedimenting disk arrays: waves and transient growth | Chajwa, Rahul; Govindarajan, Rama; Menon, Narayanan; Ramaswamy, Sriram | We study experimentally the Stokesian sedimentation (Re ∼ 10 -4) of one-dimensional lattice of disks in a quasi two-dimensional geometry with trajectories of disk centres lying in a plane. | Session 11: Fluid Structure Interactions |
| 178 | Mechanics of Deformation in 3D Granular Materials Using X-ray Measurements | Hurley, Ryan; Zhai, Chongpu; Herbold, Eric; Hall, Stephen | In this talk, I will discuss our experiments combining in-situ X-ray computed tomography (XRCT) and 3D X-ray diffraction (3DXRD) during the deformation of granular materials. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 179 | Dimensionality and viscosity exponent in shear-driven jamming | Olsson, Peter | Contrary to the prevailing picture, and in contrast to results from isotropic jamming from compression or quench, we find that the critical exponents in three dimensions are different from those in two dimensions and conclude that shear-driven jamming in two and three dimensions belong to different universality classes. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 180 | Identification of a universal data collapse in the rheology of granular media | Kim, Seongmin; Kamrin, Kenneth | We propose a reduced description of nonlocal phenomena in dense granular flows where the shear stress ratio μ is not locally determined by the inertial number (dimensionless shear rate) I. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 181 | Nonlocal rheology of dense granular flows: the effect of particle and boundary properties | Fazelpour, Farnaz; Tang, Zhu; Daniels, Karen | This model extends a local Bagnold-type granular flow law to include a Laplacian term governing the diffusion of fluidity. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 182 | Local plastic deformation in sheared highly polydisperse foams | Jiang, Yonglun; Weeks, Eric | We simulate the shear of dense two-dimensional foams using the Durian bubble model with a Lees-Edwards boundary condition. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 183 | Generalized Granular Resistive Force Theory for Rate-Dependent Intrusions | Karsai, Andras; Agarwal, Shashank; Kamrin, Kenneth; Goldman, Daniel | Based on the observed physics of the flow model simulation, we propose a modified RFT for arbitrary intruders that reconciles both cases using a geometry-dependent modification and an additional macro-inertial resistance, extending RFT beyond describing quasistatic intruding bodies. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 184 | Stick-slip and intermittent flow dynamics of a single-grain intruder driven through a granular medium with and without basal friction | Kozlowski, Ryan; Carlevaro, C; Daniels, Karen; Kondic, Lou; Pugnaloni, Luis; Socolar, Joshua; Zheng, Hu; Behringer, Robert | We report on experiments in which a grain-sized intruder is pushed by a spring through a quasi-2D granular material in an annular geometry. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 185 | Intruder dynamics in a 2D granular system: Effects of dynamic and static basal friction | Socolar, Joshua; Carlevaro, C; Pugnaloni, Luis; Kozlowski, Ryan; Zheng, Hu; Kondic, Lou | We discuss the results of simulations of an intruder pulled through a 2D granular system by a spring, using a model designed to lend insight into the experimental findings described by Kozlowski et al. [Phys. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 186 | Drafting of intruders in dry and fluid-saturated granular beds | Allen, Benjamin; Kudrolli, Arshad | We discuss an experimental study of the drag experienced by two vertical rods as they follow each other around a circular track while being dragged across a granular bed. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 187 | Reduction in Resistive Forces by Directional Air Fluidization in Dry Granular Media | Murray-Cooper, Mason; Karsai, Andras; Ozkan-Aydin, Yasemin; Naclerio, Nicholas; Hawkes, Elliot; Goldman, Daniel | Reduction in Resistive Forces by Directional Air Fluidization in Dry Granular Media | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 188 | Properties of air-fluidized granular media | Lopez-Castano, Miguel Angel; González-Saavedra, Juan Francisco; Rodríguez-Rivas, Álvaro; Vega Reyes, Francisco | We study a 2D granular system of particles intercacting via a short-ranged potential, and thermalized homogeneously. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 189 | Granular chiral separation | Dong, Ruo-Yu; Lach, Slawomir; Sobolev, Yaroslav; Grzybowski, Bartosz; Granick, Steve | We corroborate the experimental finding with theoretical predictions and extend the single particle phenomena to multi-particles. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 190 | Super-Flory scaling in compressed micro-gel packings | Elgailani, Ahmed; Maloney, Craig | We perform multi-body finite element simulations of packings of hydrogel particles immersed in a large solvent bath in 2D at various particle volume fraction, φ using the Flory-Rehner constitutive law to model the mechanics of the hydrogel network. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 191 | Flow-Arrest Transition in Granular Materials | Srivastava, Ishan; Grest, Gary; Lechman, Jeremy; Silbert, Leo | In this talk, I will describe our stress-controlled granular simulations that indicate a highly stochastic nature of this transition with long-tailed distributions of flowing times before arrest, which diverge as a power law at a critical stress ratio. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 192 | Shear thickening and jamming of dense suspensions: the importance of rolling friction | Singh, Abhinendra; Ness, Christopher; De Pablo, Juan; Jaeger, Heinrich | We show via simulations that using rolling friction together with sliding friction can significantly decrease the volume fraction required for the onset of DST and SJ leading to enhanced shear thickening. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 193 | Tuning Solvent Chemistry to Suppress Shear-Jamming in Dense Suspensions | Van der Naald, Michael; Zhao, Liang; Jackson, Grayson; Jaeger, Heinrich | We here report both steady state rheology and the transient impact response tracked by high-speed ultrasound imaging [2] for silica nanoparticles dispersed in polyethylene glycols (PEGs) of varied chain lengths. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 194 | Yielding and Rigidity of Sheared Columns of Hexapod Granules | Zhao, Yuchen; Barés, Jonathan; Socolar, Joshua | For small α, we observe a finite yield stress. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 195 | Chaotic particle dynamics above and below yield in a 2D jammed material | Galloway, Larry; Jerolmack, Doug; Arratia, Paulo | Here we present detailed quantification of Lagrangian properties (displacement lengths, arc-lengths, and enclosed area) of experimentally obtained particle trajectories for the purpose of illuminating where plasticity occurs in space and time both above and below yield. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 196 | The precursors to stick-slip events in sheared granular systems | Cheng, Chao; Basak, Rituparna; Kramar, Miroslav; Kondic, Lou | The purpose of our study is to explore the existence of precursors to slip events. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 197 | Jamming and tiling in fragmentation of rectangles | Ben-Naim, Eli; Krapivsky, Paul | We investigate a stochastic process where a rectangle breaks into smaller rectangles through a series of horizontal and vertical fragmentation events. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 198 | Contact breaking in packings of frictional disks | Chen, Yan; Wang, Philip; Wu, Qikai; Shattuck, Mark; O’Hern, Corey | We employ discrete element modeling simulations of the geometrical asperity or "bumpy particle" model to study the nonlinear vibrational response of jammed packings of frictional disks. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 199 | Modelling granular fragmentation in compacted systems | Clemmer, Joel; Bolintineanu, Dan; Lechman, Jeremy | We explore the compaction of brittle granular systems using large-scale discrete element simulations. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 200 | Electrostatic Attraction between Like-Charged Particles | Reggio, Benjamin; Tewari, Shubha | To more accurately model the origin of these attractive forces, we study the effective interaction between two dielectric spherical shells with like charge as a function of their size and charge ratios, and the dielectric constant of each. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 201 | Unforgettable random walks: forces and displacements distributions in granular systems. | Peshkov, Anton; Benson, Zackery; Richardson, Derek; Losert, Wolfgang | We show the latter to be a natural product of contacts that reign between particles. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 202 | Weakening, compaction and creep from vibration in sheared granular materials | Taylor, Stephanie; Clark, Abe; Brodsky, Emily | With laboratory experiments and discrete element method simulations, we show that low amplitude high frequency vibrations are capable of significantly reducing frictional resistance over a range of velocities in actively shearing systems. | Session 12: Granular Flows Beyond Simple Mechanical Models |
| 203 | Flow of emulsions in heterogeneous media | LE BLAY, Marine; Bartolo, Denis | Increasing the driving flow, we identify a sharp transition between a creeping regime and a mobilization regime where a finite fraction of the droplets proceed through a sparse network of branched and reconnected rivers. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 204 | Controlling capillary fingering using pore size gradients in disordered media | Lu, Nancy; Browne, Christopher; Amchin, Daniel; Nunes, Janine; Datta, Sujit | Here, we investigate how this process is influenced by a pore size gradient. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 205 | Fluid Flow Mechanisms in Shale Organic Nanopores | Perez Valencia, Felipe; Devegowda, Deepak | In this work we use molecular dynamics simulations to create molecular models of organic matter (kerogen) that host a hydrocarbon mixture that is liquid at normal conditions of pressure and temperature. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 206 | Colloidal transport in porous media: Pore-scale interplay of advection, deposition, and erosion | Bizmark, Navid; Schneider, Joanna; Priestley, Rodney; Datta, Sujit | Here, we use a transparent model porous medium to directly image in 3D the interplay between adsorption and erosion events at the pore scale. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 207 | CFD-DEM Study of Anomalous Collapse of Interacting Bubbles into an Incipiently Fluidized Bed | Padash, Azin; Boyce, Christopher | CFD-DEM Study of Anomalous Collapse of Interacting Bubbles into an Incipiently Fluidized Bed | Session 13: Granular, Porous Media, & Multiphase Flows |
| 208 | Colloid-Enhanced Mobilization of Immiscible Fluids in Porous Media | Schneider, Joanna; Bizmark, Navid; Priestley, Rodney; Datta, Sujit | Here, we show that injection of colloidal particles improves contaminant removal from a porous medium compared to ambient flow alone. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 209 | Complex Conductivity in Saturated Porous Media: Role of Membrane Polarization | Li, Qiuzi; Feng, Lang; Cameron, Steve; Deckman, Harry; Ertas, Deniz | We establish a theoretical framework relating spectral complex conductivity in these systems to the geometry and intrinsic properties of the materials, and validate the results with experiments on model systems. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 210 | Nonlinear acoustic resonance and wave-induced softening in dense granular matter through flow heterogeneities | Lieou, Charles; Laurent, Jerome; Johnson, Paul; Jia, Xiaoping | We report a series of experiments on the softening and compaction of a dense granular pack through traveling acoustic pressure and shear waves. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 211 | Scaling and dynamics of impacts into cornstarch and water suspensions | Brassard, Marc; Causley, Neil; Dijksman, Joshua; Clark, Abe | Recent work has shown that the forces during the initial moments of impact are too large to be described by discontinuous shear thickening (DST), which is a steady-state description. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 212 | Peak Force Scaling During Impacts into Wet and Dry Granular Materials | Causley, Neil; Krizou, Nasser; Brassard, Marc; Dijksman, Joshua; Clark, Abe | We show that the magnitude and time scales of the peak forces obey power law scaling that is similar across the different types of materials we study, and we use dimensional analysis to isolate the relevant physical mechanisms. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 213 | Proper Spatial Average Operators in a Heterogeneous Porous Medium | Taghizadeh, Ehsan; Wood, Brian | In this work, we explore a wide range of kernel functions commonly used in Bayesian statistics to evaluate their functionality in attenuating geometrical fluctuations arising from sudden change in the porosity in a heterogeneous porous medium. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 214 | Fluid Flow with Suspended Soft Particles in Porous Media | Li, Shuaijun; Fan, Jing | In this work, we study transport of mono-dispersed suspended soft particles in porous media. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 215 | Granular packings with sliding, rolling and twisting friction | Santos, Andrew; Srivastava, Ishan; Bolintineanu, Dan; Lechman, Jeremy; Grest, Gary; Silbert, Leo | We perform discrete element modeling simulations to construct sphere packings implementing a range of frictional constraints under a stress-controlled protocol. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 216 | Elastogranular Buckling of a Slender Ring | Schunter, Jr., David; Holmes, Douglas | Previous work has focused on thin structures deforming within media that, in general, have both compositional and mechanical homogeneity. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 217 | Using time-dependent random resistor networks to capture the dynamics of flow in disordered porous media | Zareei, Ahmad; Parsa, Shima; Weitz, David; Amir, Ariel | In order to better understand the effect of microstructure on flow behavior, we study a model based on a disordered network of tubes, mathematically equivalent to a random resistor network. | Session 13: Granular, Porous Media, & Multiphase Flows |
| 218 | Optimal Signal Transduction with Silicon Transistors Enable Therapeutic Enzyme Regulation | Balijepalli, Arvind; Le, Son; Morris, Michelle; Pant, Harish; Richter, Curt | We used commercially sourced n-channel silicon field-effect transistors (nFETs) operating under PID control to demonstrate pH measurements with a resolution of (7.2±0.3)x10 -3 at 10 Hz. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 219 | Protein-Corona-by-Design in 2D: A Molecular Dynamics study to Decode Bio-Nano Interactions for Quality-by-Design Nanomedicines | Al-Badri, Mohamed Ali; al-Jamal, Khuloud; Lorenz, Christian | Here we investigate the interaction of graphitic materials with an array of proteins with all-atom molecular dynamics simulations and perform analytical modelling ito identify safe and toxic protein corona profiles in 2D that could pave the way for future quality by design 2D/3D nanomedicines & better clinical translation. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 220 | Single-Molecule Characterization of Nanoparticle Bioconjugates using Microwell Array Analysis | Abdul-Moqueet, Mohammad; Tovias, Leeana; Mayer, Kathryn | A need for characterizing these nanoparticle bioconjugates at the single-particle level using optical methods is needed. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 221 | Single-Molecule Kinetics of Taq Polymerase up to 94 °C | Turvey, Mackenzie; Lee, Wonbae; Taulbee, Jeffrey; Lau, Calvin; Gabriel, Kristin; Vargas, Rebecca; Weiss, Gregory; Collins, Philip | Our electronic biosensor approach provides direct access to single-nucleotide incorporation activity [2] from room temperature up to 94 °C. For example, the incorporation rate of a single Taq molecule was monitored from 1 bp/s at 22 °C to greater than 100 bp/s at 72 °C, the typical PCR operating temperature. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 222 | Monitoring Antipsychotic Drug Effects on Stimulated Dopamine Release Using Carbon Nanotube Transistors with Nafion-Radical Hybrid Films | Park, Inkyoung; Pham Ba, Viet Anh; Cho, Dong-guk; Hong, Seunghun | In this work, carbon nanotube field-effect transistors with floating electrodes were functionalized with nafion films containing 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS●) radicals to build selective biosensors for the dopamine detection. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 223 | Synthesis and toxicity of bio-templated fluorescent metal nanoclusters in human Neuro-2a cells | Karna, Shashi; Perry, Karima; Kumar, Raj; Gupta, Raj | Here we present the synthesis of Au and Fe nanoclusters synthesized in vitro using human neuro-2a cells. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 224 | Protein Aggregation Characterization by Nanopore technology | Li, Jiali | In this talk, we report our study on characterizing protein aggregation with a solid-state nanopore device, together with AFM and DLS techniques. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 225 | Active and stable palladium nano-thin-film structure development for rapid and direct biomolecules conjugation and sensing | Chang, Chia-Ching; Chang, Chia-Yu; Huang, Yun-Tzu; Chen, Wei | In this study, a PET substrate has been selected for metal atoms absorption and a stable and active Pd nano-thin-film (NTF) surface has been developed. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 226 | Spontaneous ssDNA Stretching on Graphene and Hexagonal Boron Nitride In-plane Heterostructures | Luan, Binquan | Given the significance of ssDNA stretching in genome analysis, here a novel ssDNA stretching platform is proposed: two dimensional in-plane heterostructure comprising graphene and hexagonal boron nitride (h-BN), and I show that ssDNA can be stretched on a h-BN nanostripe sandwiched between two adjacent graphene domains ("nanochannel”). | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 227 | Block Optical DNA Sequencing with Plasmonic Substrates for Rapid Biomarker Diagnostics | Korshoj, Lee; Prabhune, Ameya Gajanan; Nagpal, Prashant | In a push for improved precision diagnostics, we describe an optical sequencing platform that uses surface-enhanced Raman spectroscopy (SERS) measurements from plasmonic nanostructured surfaces and nanoparticles for label-free determination of nucleobase content in DNA k-mer blocks. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 228 | Dynamics of DNA in periodic temperature gradient field created by plasmonic heating | Shimada, Ryoko; Watanabe, Hiroshi | In this work, we utilized the plasmonic heating from periodic silver (Ag) domains under emission of blue light (400 – 440 nm) to create the periodic temperature gradient (with a large amplitude of ~ 0.5 K/um), thereby attempting to observe the Soret effect on DNA molecules mixed in polyethylene glycol (PEG) solutions. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 229 | Tunneling Spectroscopy on Engineered Surfaces for RNA Nucleotide and Structural Label Identification | Korshoj, Lee; Abel Jr., Gary; Chatterjee, Anushree; Nagpal, Prashant | We present a method for identification of RNA nucleotides and structural labels for mapping of single RNA molecules. | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 230 | Conformational heterogeneity in human interphase chromosome organization reconciles the FISH and Hi-C paradox | Shi, Guang; Thirumalai, Dave | Here, we show that the FISH-Hi-C paradox can be resolved using a theory based on a Generalized Rouse Model for Chromosomes (GRMC). | Session 14: Interrogating Biomolecules with Synthetic Nanostructures |
| 231 | Force generation and self-organization in mitosis | Betterton, Meredith | This talk will discuss how force is generated by motors, crosslinkers, and chromosomes over time during mitosis to correctly assemble the spindle. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 232 | Intrinsic time-scales of active forces control the dynamics of soft living matter | Gradziuk, Grzegorz; Torregrosa Cortés, Gabriel; Broedersz, Chase | Living cells are crowded with active agents which consume energy and perform work on their surrounding environment, constantly keeping the system out of thermodynamic equilibrium. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 233 | Mechanical properties of intermediate filament networks under compression | Carroll, Bobby; Gandikota, Mahesh Chandrasekhar; Elbalasy, Iman; Schnauss, Joerg; Kas, Josef; Schwarz, Jennifer; Patteson, Alison | Here, we study the mechanical response of reconstituted polymer networks comprised of the intermediate filament proteins vimentin and keratin using a parallel-plate rheometer. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 234 | Cytoskeletal Regulation of Three-Dimensional Epithelial Cell Shape | Chmiel, Theresa; Gardel, Margaret | By examining the relationship between cell height, density and biological components of the actin cytoskeleton, we explore the mechanisms by which epithelial cells regulate shape and volume. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 235 | Physical limits to sensing material properties | Beroz, Farzan; Zhou, Di; Mao, Xiaoming; Lubensky, David | In this talk, I will present the limits to the precision of such constitutional sensing for sensors embedded in disordered media. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 236 | Cell shape as a window into cell state | Prasad, Ashok | Using these we show that quantifiers of cell shape and cytoskeletal texture can be used to discriminate between different cell states. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 237 | The Morphodynamics of 3D Migrating Cancer Cells | Eddy, Christopher; Wong, Ryan; Sun, Bo | Here, we physically characterize morphodynamics (the temporal fluctuations of cell shape) rather than real-space migration alone. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 238 | Switching between optimum substrate rigidity and focal adhesion reinforcement at the cell leading edge | De, Partho Sakha; De, Rumi | We have developed a theoretical model for the dynamics at the leading edge of a cell placed on a viscoelastic substrate, involving a pair of coupled reaction-diffusion equations. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 239 | Mechanics of endocytosis under large osmotic pressure | Ma, Rui; Berro, Julien | In this talk, I will discuss membrane deformations powered by a point force under the condition of high pressure and low tension, which is rarely studied but directly relevant for endocytosis in yeast cells with a cell wall. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 240 | Plasticity in vertex model of epithelial tissues | Popovic, Marko; Druelle, Valentin; Wyart, Matthieu | Motivated by this question in this work we study plastic properties of vertex model of epithelial tissues, in which mechanical properties of cells are prescribed and emerging tissue mechanics is obtained from their collective behaviour. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 241 | Loops versus lines and the compression stiffening of cells | Gandikota, Mahesh Chandrasekhar; Pogoda, Katarzyna; van Oosten, Anne; Engstrom, Tyler; Patteson, Alison; Janmey, Paul; Schwarz, Jennifer | We find for the fiber network with area-conserving loops model that the stress-strain curves are sensitive to the packing fraction and size distribution of the area-conserving loops, thereby creating a mechanical fingerprint across different cell types. | Session 15: Mechanics of Cells and Tissues Across Scales |
| 242 | Wetting and dewetting of nanoscale films of nematic liquid crystal | Cummings, Linda; Kondic, Lou; Lam, Michael; Mema, Ensela | We present a simplified thin-film model for the free surface evolution that includes strong spatially-varying planar anchoring at the substrate, and weak antagonistic anchoring at the free surface. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 243 | A phase-field model for a modulated-disordered interface with varying density | Vitral, Eduardo; Leo, Perry; Vinals, Jorge | We derive a phase-field model that accounts for a varying density field and represents the smectic layering by an order parameter. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 244 | Non-reciprocal motion in superparamagnetic magnetoelastic membrane patches | Brisbois, Chase; Tasinkevych, Mykola; Olvera De La Cruz, Monica | We develop a theoretical approach for autonomous locomotion of superparamagnetic membranes through viscous media. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 245 | Particle motion nearby rough surfaces | Kurzthaler, Christina; Pahlavan, Amir; Zhu, Lailai; Stone, Howard | Here, we study the hydrodynamic couplings between particles and solid, rough boundaries that are characterized by periodic and random surface shapes. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 246 | Growth of clogs in parallel microchannels | Dressaire, Emilie; Villermaux, Emmanuel; Sauret, Alban | We present an analytical description that captures the time evolution of the volume of the aggregates. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 247 | Flow and Fouling in Elastic Membrane Filters with Complex Pore Morphology | Sanaei, Pejman; Liu, Shi Yue; Chen, Zhengyi | In this work, we consider standard blocking as a fouling mechanism, which decreases membrane porosity. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 248 | Hydrodynamic shock and instability in sedimenting colloidal suspensions along a surface | Karapetyan, Shake; Wilken, Sam; Tanaka, Michio; Sprinkle, Brennan; Donev, Aleksandar; Chaikin, Paul | We combine experiments, large-scale simulations, and a continuum model to study the emergence of a coherent density profile in a suspension of passive particles sedimenting near an inclined plane. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 249 | Unsteady Sedimentation of a Colloidal Sphere in a Horizontal Channel | Altman, Lauren; Grier, David | We investigate the limits of the Oseen superposition approximation in this canonical system by measuring the trajectories of colloidal spheres sedimenting through water in slit pores. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 250 | Stresslet of colloidal suspensions in a spherical cavity | Gonzalez Gonzalez, Emma del Carmen; Zia, Roseanna | Here we present the exact solution for stresslet hydrodynamic functions of a colloid in a spherical cavity, and its application to more concentrated suspensions via the Confined Stokesian dynamics algorithm. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 251 | Shape induced segregation and anomalous diffusion of particles under confinement | Li, Jiyuan; Singh, Abhinendra; Jiang, Xikai; Hernandez-Ortiz, Juan; De Pablo, Juan; Jaeger, Heinrich | We find that increasing the fraction of cylinders induces particle segregation, where the spherical particles are pushed towards the wall, while the cylinders prefer to be near the center of the cavity. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 252 | Equilibrium diffusion, thermodynamics, and rheology of confined Brownian suspensions | Sunol, Alp; Zia, Roseanna | Here, we present the results of our dynamic simulation studies using both Confined Stokesian Dynamics and Confined Brownian Dynamics algorithms. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 253 | Auto-phoretic nanorods driven up the wall by gravity | Brosseau, Quentin; Balboa Usabiaga, Florencio; Lushi, Enkeleida; Wu, Yang; Ristroph, Leif; Ward, Michael; Shelley, Michael; Zhang, Jun | Here we study the gravitaxis of heavy self-electrophoretic Janus nanorods that move upwards on a steeply inclined substrate. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 254 | When microrollers meet anisotropy | van der Wee, Ernest; Kotni, Ramakrishna; van Blaaderen, Alfons; Driscoll, Michelle | Here we study a system in which these collective interactions are largely driven by hydrodynamics: microrollers. | Session 16: Microflows Meet Soft Matter: Crystals, Colloids, & Particles |
| 255 | Viscous flows with thin, compliant boundaries | Vella, Dominic | I will give examples of some of these unusual behaviours, focussing on situations in which the compliant boundary is in some sense thin, as well as discussing the validity of the different models of boundary compliance. | Session 17: Microflows Meet Soft Matter: Deformation |
| 256 | Slicing Soft Materials | Rhodes, Steven; Weeks, Eric | We experimentally study the slicing of soft materials. | Session 17: Microflows Meet Soft Matter: Deformation |
| 257 | Valve Elasticity for Optimal Lymphatic Pumping | Wolf, Ki; Dixon, J. Brandon; Alexeev, Alexander | We use fully coupled, three-dimensional fluid-structure interaction model to study the performance of compliant lymphatic valves in the lymphatic vessel that undergoes peristaltic motion. | Session 17: Microflows Meet Soft Matter: Deformation |
| 258 | Soft hydraulics: Theory of flow in deformable microchannels | Anand, Vishal; Christov, Ivan; Shidhore, Tanmay; Wang, Xiaojia | We propose a perturbative approach to solving soft hydraulics problems. | Session 17: Microflows Meet Soft Matter: Deformation |
| 259 | Devising and characterizing a non-perturbative manipulator in 3D microfluidic channels | Gonzalez, Jeremias; Liu, Bin | Here, we investigate the capability of such non-perturbative manipulations in a microscope-compatible 3D microfluidic device having vertically offset channels converging on a middle chamber. | Session 17: Microflows Meet Soft Matter: Deformation |
| 260 | The interaction of elastomeric coatings with viscous flows: how incompressible is PDMS? | Chandler, Thomas; Vella, Dominic | We will present a model for thin, near-incompressible elastic foundations, and discuss how its application to examples of fluid-structure interaction problems at low Reynolds number can depend sensitively on how incompressible the coating is. | Session 17: Microflows Meet Soft Matter: Deformation |
| 261 | Active Foam: Connecting Structure, Dynamics and Control | Kroo, Laurel; Bull, Matthew; Prakash, Manu | The goal of this work is to understand fundamental principles of confluent tissues and develop functional synthetic analogs. | Session 17: Microflows Meet Soft Matter: Deformation |
| 262 | Active sieving : from flapping nano-doors to vibrating nanotubes | Marbach, Sophie; Dean, David; Bocquet, Lyderic | Here we investigate alternative approaches to separation and filtration. | Session 17: Microflows Meet Soft Matter: Deformation |
| 263 | Fibre-reinforced microfluidic droplets | Elettro, Herve; Gallaire, Francois | Fibre-reinforced microfluidic droplets | Session 17: Microflows Meet Soft Matter: Deformation |
| 264 | Pulp friction: lubricating properties of soft particle suspensions | Dijksman, Joshua; Rudge, Raisa; Scholten, Elke | The suspension lubrication deviates from typical Stribeck behavior as we find four frictional flow regimes. | Session 17: Microflows Meet Soft Matter: Deformation |
| 265 | Propagation and interactions of hydraulic fractures in model heterogeneous solids | Aime, Stefano; Weitz, David | In this work we study the propagation of hydraulic fractures in model, well-controlled colloidal materials, using microfluidics coupled to an innovative dynamic light scattering technique providing time- and space-resolved information on the local strain and the microstructural damage caused in the material by the propagating crack. | Session 17: Microflows Meet Soft Matter: Deformation |
| 266 | Effect of the 3D swelling of microgels on their 2D phase behavior at the liquid-liquid interface | Bochenek, Steffen; Scotti, Andrea; Isa, Lucio; Richtering, Walter | We investigate soft, temperature-sensitive microgels at fluid interfaces and how changing temperature across the microgels’ volume phase transition temperature, which leads to swelling/deswelling of the microgels in the aqueous phase, affects the phase behavior within the monolayer. | Session 17: Microflows Meet Soft Matter: Deformation |
| 267 | Underactuated fluidic control of continuous multistable structures | Peretz, Ofek; Mishra, Anand; Shepherd, Robert; Gat, Amir | This work addresses the challenge of underactuated pattern generation in continuous multistable structures. | Session 17: Microflows Meet Soft Matter: Deformation |
| 268 | Formation of Pickering Emulsions Using Nanodiamonds | Farias, Barbara; Brown, Derek; Hearn, Allison; Khan, Saad | We examine here the use of nanodiamonds (ND), a relatively novel carbonaceous filler with high adsorption activity, small size, and large surface area to create solid stabilized emulsions. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 269 | Utilizing Inorganic Nanoadditives to Influence the Surface Properties of Polymer Films | Anastasiadis, Spiros; Krasanakis, Fanourios; Theodorakis, Antigonos; Chrissopoulou, Kiriaki | In this work, we report on the development of superhydrophobic and water repellent polymer coatings by utilizing nanoadditives of different geometries and size. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 270 | Interfacial Dynamics of Confined Microgel Liquids on Soft Surfaces | Lin, Kehua; Zhu, Yingxi Elaine | In this work, we employed poly(N-isopropylacrylamide) (PNIPAM) microgels of varied crosslinking density as the confined liquids as well as confining surface coatings. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 271 | How osmotic pressure governs sliding and surface structures of swollen crosslinked hydrogels | Bonyadi, Shabnam; Johnson, Christopher; Kim, Jiho; Reale, Erik; Atten, Michael; Dunn, Alison | Here I present two vignettes of the role of osmotic pressure in understanding hydrogel lubrication. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 272 | Bio-inspired surface modification of PDMS to reduce dry friction | Wang, Mengyuan; Ghosh, Sujan; Blevins, Adrienne; Stafford, Christopher; Kilgore, Jason; Huang, Sijia; Zou, Min; Ding, Yifu | This study aims to mimic such functional skins by modifying both the stiffness and topography of the elastomeric surfaces. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 273 | Friction and wear of polyzwitterionic brush-grafted surfaces | Serfass, Christopher; Roe, Emily; Hsiao, Lilian | Inspired by the hydrophilic biomacromolecules adsorbed to the surface of articular cartilage, we investigate the tribology of betainized poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brushes grafted on soft poly(dimethyl siloxane) (PDMS) and hard silicon substrates. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 274 | Surface Forces Apparatus Measurements Between Oppositely Charged Polyelectrolyte Brushes as a Function of Ionic Strength | Mastropietro, Dean; Tirrell, Matthew | Surface Forces Apparatus Measurements Between Oppositely Charged Polyelectrolyte Brushes as a Function of Ionic Strength | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 275 | Tribology of soft colloidal microgels: An oral perspective | Sarkar, Anwesha | A case study 4 will be presented on how these microgels can act as viscosity modifiers of the continuum, where the lubrication performance can be quantitatively described using the Newtonian plateau value ( η ∞). | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 276 | Pore-size dependence and glassy behavior of hydrogel friction on smooth surfaces | Cuccia, Nicholas; Pothineni, Suraj; Wu, Brady; Burton, Justin | Using a custom-built, continuous pin-on-disc tribometer, here we identify three distinct regimes of frictional behavior for both polyacrylamide (PAAm) and agarose hydrogel spheres on smooth surfaces. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 277 | Study of the tribological behavior of hydrogel-like materials with an extended Surface Forces Apparatus | Espinosa-Marzal, Rosa; Shoaib, Tooba | In this talk, we will present steady and dynamic shear measurements with an extended surface forces apparatus (eSFA) on hydrogel thin films under modulated compression. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 278 | Indentation of a microparticle into an oil-coated, soft silicone surface | Glover, Justin; Pham, Jonathan | A simple model that balances the capillary force of the oil layer with the elastic force from the substrate is proposed to predict the position of the particle. | Session 18: Polymers and Soft Solids at Interfaces: Tribology, Wear, Rheology and Interactions |
| 279 | Scattering of a fast-swimming bacterium off of a surface | Petroff, Alexander; Mcdonough, Schuyler; Roque, Benjamin | Here we present the first experimental observations of the scattering of a fast-swimming bacterium off of a flat surface. | Session 19: Swimming, Motility, & Locomotion |
| 280 | Optically-Powered Microscopic Bubble Rockets | Norris, Samantha; Reynolds, Michael; Cortese, Alejandro; McEuen, Paul | In this talk, we demonstrate a new optically-powered approach to catalyst-free bubble self-propulsion that works in a broad range of fluids, including deionized water. | Session 19: Swimming, Motility, & Locomotion |
| 281 | Antagonism in multiple-cue chemotaxis in breast cancer cells | Saha, Soutick; Moon, Hye-ran; Han, Bumsoo; Mugler, Andrew | We used triple-negative breast cancer cells to study chemotaxis towards cues formed by multiple growth factors and found, surprisingly, that the bias in the movement was less pronounced when we combine two attractant gradients compared to when we have individual gradients. | Session 19: Swimming, Motility, & Locomotion |
| 282 | A universal mechanism for chiral swimming at low Reynolds number | Cortese, Dario; Wan, Kirsty | We combine theory and experiment to reveal how Chlamydomonas actively modulates asymmetries in flagellar beating to produce axial rotation and steering. | Session 19: Swimming, Motility, & Locomotion |
| 283 | Bacterial swarming: Motion under extreme forces? | Gudavadze, Irakli; Korf, Janelle; Florin, Ernst-Ludwig | Here we present a novel method for measuring film thickness with tens of nanometer precision. | Session 19: Swimming, Motility, & Locomotion |
| 284 | Analysis of run-reverse-reorient motility of Helicobacter pylori and its ΔChePep mutant1 | Liao, Wentian; Constantino, Maira; Amieva, Manuel; Bansil, Rama | We analyze translational and cell body rotational motility data obtained by phase contrast microscopy to compare the speed and turn angle distribution of the wild type (WT) with the ΔChePep mutant and compare with run-reversal-reorient model and Resistive Force Theory calculations of torque. | Session 19: Swimming, Motility, & Locomotion |
| 285 | Force and torque on a rotating helical flagellum near a boundary | Rodenborn, Bruce; Romero, Cesar; Lee, Jin; Nguyen, Hoa; Shindell, Orrin | We show that all of the data can be collapsed onto a single curve by non-dimensionalizing the force, torque and boundary distance appropriately. | Session 19: Swimming, Motility, & Locomotion |
| 286 | A minimal neural reaction-diffusion model which generates C. elegans undulation | Hastings, Harold; Magnes, Jenny; Susman, Kathleen; Congo, Cheris; Hulsey-Vincent, Miranda; Singhvi, Anshul; Tasnim, Rifah; Negassa, Naol | We describe a minimal reaction-diffusion model for the C. elegans central pattern generator (CPG) (c.f. Xu et al. 2018, Wen et al. 2012). | Session 19: Swimming, Motility, & Locomotion |
| 287 | Swimmers at low Reynolds number driven by Quincke rotation | Han, Endao; Zhu, Lailai; Shaevitz, Joshua; Stone, Howard | Here we present an artificial swimmer at low Reynolds number driven by an elasto-electro-hydrodynamic instability [1] based on Quincke rotation: a sphere in oil rotates in the presence of a high DC electric field. | Session 19: Swimming, Motility, & Locomotion |
| 288 | Aerotaxis in Sinorhizobium meliloti, a soil bacterium | Bouvard, Julien; Moisy, Frederic; Auradou, Harold | To study and compare this not yet referenced aerotaxis to the already found chemotaxis, we made a few experimental set-ups. | Session 19: Swimming, Motility, & Locomotion |
| 289 | Pairwise and Collective Interactions of a Model Swimmer at Intermediate Reynolds Numbers | Dombrowski, Thomas; Bhalla, Amneet Pal Singh; Griffith, Boyce; Klotsa, Daphne | In this presentation, we investigate pairwise interactions between reciprocal, asymmetric dumb-bell swimmers at intermediate Reynolds numbers (Re). | Session 19: Swimming, Motility, & Locomotion |
| 290 | Hydrodynamics of biomimetic propulsion using externally and internally actuated fins | Demirer, Ersan; Alexeev, Alexander | We combine experiments and computer simulations to examine the hydrodynamics of two different actuation types that can be used to actuate an elastic plate to serve as a biomimetic propulsor in robotic fish. | Session 19: Swimming, Motility, & Locomotion |
| 291 | Physical Limits of Marangoni-driven Patterning | Stanley, Steven; Bonnecaze, Roger | Here, we present a model for Marangoni-driven patterning and perform a nonlinear analysis to determine the physical limits of pattern aspect ratio and feature pitch for an equal line-space system. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 292 | Hydrodynamic and Surface-Wetting Effects on Phase Separation Dynamics in Thin-Film Melts | Goyal, Abheeti; Van der Schoot, Paul; Toschi, Federico | Typically, the dynamics of fluid-fluid demixing is modeled using relaxational phase field-type theories that ignore the role of hydrodynamics. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 293 | Molecular Dynamics Simulations of Creep in Silica-Water Systems | Johansson, Anders; Sveinsson, Henrik; Thøgersen, Kjetil; Hafreager, Anders; Aharonov, Einat; Malthe-Sørenssen, Anders | In this work, we demonstrate that molecular dynamics simulations provide new insights on creep in water-wetted silicates. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 294 | Nonlinear Interface Equation For Capillary Driven Flow in 3D Open Curved Trajectories | White, Nicholas; Troian, Sandra | Here we present an extension of this classic work to flow in 3D open and curved channels in which the trajectory radius of curvature is larger than the film thickness. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 295 | Theory of the two-dimensional paraelectric structural transformation of ferroelectric group-IV monochalcogenide monolayers | Barraza-Lopez, Salvador; Villanova, John; Kumar, Pradeep | In this presentation, we disclose a quadratic dispersion of softening modes and analyze molecular dynamics data to understand the atomistic motions underlying the ferroelectric to paraelectric transformation in these atomically thin membranes. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 296 | Evolution of elastic moduli through a two-dimensional structural transformation | Pacheco-Sanjuan, Alejandro; Bishop, Tyler; Farmer, Erin; Kumar, Pradeep; Barraza-Lopez, Salvador | As additional support for the existence of a quantum paraelastic phase, we use a qualitative WKB analysis [2] to estimate escape times from an energy well on the landscape. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 297 | Laser-induced strong Marangoni effect in deformation and manipulation of ferrofluid | Lin, Feng; Vishal, Talari; Zhao, Junyi; Schaibley, John; Liu, Dong; Wang, Zhiming; Bao, Jiming | We demonstrate the laser-induced deformation of ferrofluid surfaces with ultra-violet to infra-red lasers. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 298 | Long-time evolution of interfacial structure in dewetting | He, Mengfei; Nagel, Sidney | To quantify the absolute thickness of these steady-state structures precisely, I have developed an interferometric technique taking advantage of a varying angle of incidence. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 299 | Flows at Molecular Scales: Probing and Manipulating Ultra-Thin Supported Liquid Films | Clavaud, Cecile; Talini, Laurence; Frétigny, Christian | We have developed a fully non invasive optical technique [Phys. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 300 | Towards nanoscale confinement in TEM liquid cells | Sendgikoski, Kyle; Kanwal, Alokik; Liddle, James; Cumings, John | We report on improvements made to a monolithic, in-situ TEM liquid cell 1 with sub 40nm liquid thickness that overcomes the common challenges encountered with two-piece TEM liquid cells. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 301 | Chemical Vapor Deposition Growth of Nickel Sulfide for optoelectronic device applications | ., Nidhi; Nautiyal, Tashi; Das, Samaresh | Several spectroscopic studies reveal the high-quality crystalline nature of CVD grown NiS 2 film. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 302 | Colloidal migration in microchannels under combined potential and pressure gradients | Prakash, Shaurya; Lochab, Varun | Here, we discuss the effect of manipulating particle properties and fluid inertia over broad parametric ranges to elucidate robustness of particle migration to and away from walls, and the formation of particle bands. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 303 | Lattice Boltzmann Method for Designing cellular solids for effective acoustic noise cancellation | Zope, Rajat; Dayal, Pratyush | Here, we design sound-absorbing materials and establish that by tailoring their morphological features, we can achieve acoustic noise cancellation, effectively. | Session 20: Thin Films, Surface Flows, and Interfaces |
| 304 | What do we learn from the finite lifetime of turbulence? | Goldenfeld, Nigel | I discuss these findings and their later extensions in terms of extreme value statistics and finite-size scaling, and show that the finite lifetime in pipe flow does not necessarily contradict the notion that there is a sharp laminar-turbulence transition in the universality class of directed percolation. | Session 21: Transitional Flows & Chaotic Dynamics: In Honor of Bruno Eckhardt |
| 305 | Is space time? A spatiotemporal tiling of turbulence | Cvitanovic, Predrag; Gudorf, Matthew; Liang, Han | We address the long standing problem of how to describe, by means of discrete symbolic dynamics, the spatiotemporal chaos (or turbulence) in spatially extended, strongly nonlinear field theories. | Session 21: Transitional Flows & Chaotic Dynamics: In Honor of Bruno Eckhardt |
| 306 | Deep learning to discover the dimension of an inertial manifold and predict dynamics on it | Graham, Michael | We describe a method to map the dynamics onto a translationally invariant low-dimensional manifold and time-evolve them using neural networks (NN). | Session 21: Transitional Flows & Chaotic Dynamics: In Honor of Bruno Eckhardt |
| 307 | The onset of turbulence: from invariant solutions to a directed percolation phase transition | Hof, Bjoern | The onset of turbulence: from invariant solutions to a directed percolation phase transition | Session 21: Transitional Flows & Chaotic Dynamics: In Honor of Bruno Eckhardt |
| 308 | Nonlinear invariant solutions underlying spatio-temporal patterns in thermally driven shear flows | Schneider, Tobias | We present exact invariant solutions capturing both the dynamics and the spatial localization of these so-called transverse bursts. | Session 21: Transitional Flows & Chaotic Dynamics: In Honor of Bruno Eckhardt |
| 309 | Propagating oscillons in a 1Dim. Faraday experiment | Wesfreid, Jose; Kucher, Samantha; Cobelli, Pablo | We present the first experimental evidence of the existence of trains of propagating oscillons or localized structures in a 1D Faraday experiment in water. | Session 22: Turbulence & Nonlinear Dynamics |
| 310 | Linearly driven flow on a rotating sphere | Supekar, Rohit; Heinonen, Vili; Burns, Keaton; Dunkel, Jörn | Here, we extend the analysis to actively driven flows on rotating spheres, motivated in part by the complex flow patterns observed in planetary atmospheres. | Session 22: Turbulence & Nonlinear Dynamics |
| 311 | Numerical Simulations of Gravitational Waves from Early-Universe Turbulence | Roper Pol, Alberto | We perform direct numerical simulations of magnetohydrodynamic turbulence in the early universe and numerically compute the resulting stochastic background of gravitational waves and relic magnetic fields. | Session 22: Turbulence & Nonlinear Dynamics |
| 312 | Imaging Fluorescence of He*2 Excimers Created by Neutron Capture in Liquid He II—a New Approach for Turbulent Flow Research | Wen, Xin; Bao, Shiran; McDonald, Landen; Pierce, Josh; Greene, Geoffrey; Crow, Morris; Tong, Xin (Tony); Mezzacappa, Anthony; Glasby, Ryan; Guo, Wei; Fitzsimmons, Michael | We show unequivocal evidence for formation of He * 2 excimers in liquid He II created by ionizing radiation produced through neutron capture. | Session 22: Turbulence & Nonlinear Dynamics |
| 313 | Small-scale Energy Transfer in Turbulence | Chen, James; Cheikh, Mohamad | The analysis reveals that at the small-scale both forward and inverse energy cascade exist in homogeneous isotropic turbulence while an overall negative energy flux (forward cascade) is present globally. | Session 22: Turbulence & Nonlinear Dynamics |
| 314 | Optimal perturbations for transient growth in a 3D stratified channel using nonlinear direct-adjoint looping | Thakur, Ritabrata; Sharma, Arjun; Govindarajan, Rama | We obtain the maximum perturbation energy growth in a three-dimensional heated plane channel. | Session 22: Turbulence & Nonlinear Dynamics |
| 315 | Role of elasticity and solvent viscosity on the center mode instability in pipe Poiseuille flow of Oldroyd-B fluids. | Chaudhary, Indresh; Subramanian, Ganesh; Shankar, Viswanathan | The stability has been analyzed for axisymmetric perturbations using pseudospectral and shooting methods. | Session 22: Turbulence & Nonlinear Dynamics |
| 316 | Turbulence generation through an iterative cascade of the elliptical instability | McKeown, Ryan; Ostilla Monico, Rodolfo; Pumir, Alain; Brenner, Michael; Rubinstein, Shmuel | We demonstrate the existence of a novel mechanism in which two counter-rotating vortices violently collide and break down, leading to the rapid development of a turbulent energy cascade mediated by iterations of the elliptical instability. | Session 22: Turbulence & Nonlinear Dynamics |
| 317 | 3D Visualization of Reconnections in Vortex Ring Collision | Newbolt, Joel; McKeown, Ryan; Rubinstein, Shmuel | 3D Visualization of Reconnections in Vortex Ring Collision | Session 22: Turbulence & Nonlinear Dynamics |
| 318 | Dynamics and deformation of a vortex during pairing under the influence of external shear | Folz, Patrick | The main flow regimes, pairing and separation, are identified and briefly discussed; this work focuses on vortex-dominated pairings, in which the shear is observed to primarily aid or hinder the onset of detrainment, which precipitates the main convective interaction that results in a single final vortex. | Session 22: Turbulence & Nonlinear Dynamics |
| 319 | Transition to Condensate Formation in a Thin Rotating Fluid Layer | Linkmann, Moritz; Buzzicotti, Michele | With a view towards atmospheric physics, we study the formation of the condensate in a rotating thin layer with free-slip boundary conditions as function of the amplitude of the forcing, and we quantify the effect of large-scale friction. | Session 22: Turbulence & Nonlinear Dynamics |