497 citations · 3.6k across the 62 of their papers we have counts for
52 papers · 1 filter
Controlling Turbulent Flows in Compressible Active Liquid Crystals
Dimitrios Krommydas, Paarth Gulati, Aparna Baskaran +1
Motivated by experiments on light-patterned, quasi-2D active suspensions that exhibit large density variations, we develop a continuum theory of compressible active nematics--suspe…
Segregation dynamics in active-passive mixtures of semiflexible filaments
Chitrak Bhowmik, Aparna Baskaran, Sriram Ramaswamy
We study the segregation of motile semiflexible filaments from a background of similar but non-motile filaments. Our Langevin dynamics simulations reveal a wide range of emergent s…
Coarsening of biomimetic condensates in a self-stirring active fluid
Jeremy Laprade, Layne Frechette, Christopher Amey +4
Coarsening, the process where larger structures grow at the expense of smaller ones, is a fundamental aspect of multiphase systems. The cell cytoplasm exemplifies an out-of-equilib…
The mechanics of disclination emergence in 3D active nematics
Yingyou Ma, Christopher Amey, Aparna Baskaran +1
The spontaneous creation of disclinations is a defining characteristic of active nematics, which is rarely observed in equilibrium systems or other active matter systems. Thus, und…
Active noise-induced dynamic clustering of passive colloids
Layne B. Frechette, Aparna Baskaran, Michael F. Hagan
Active fluids generate spontaneous, often chaotic mesoscale flows. Harnessing these flows to drive embedded soft materials into structures with controlled length scales and lifetim…
Achieving designed texture and flows in bulk active nematics using optimal control theory
Saptorshi Ghosh, Aparna Baskaran, Michael F. Hagan
Being intrinsically nonequilibrium, active materials can potentially perform functions that would be thermodynamically forbidden in passive materials. However, active systems have…
Spatiotemporal control of structure and dynamics in a polar active fluid
Saptorshi Ghosh, Chaitanya Joshi, Aparna Baskaran +1
We apply optimal control theory to a model of a polar active fluid (the Toner-Tu model), with the objective of driving the system into particular emergent dynamical behaviors or pr…
Deep-learning Optical Flow Outperforms PIV in Obtaining Velocity Fields from Active Nematics
Phu N. Tran, Sattvic Ray, Linnea Lemma +6
Deep learning-based optical flow (DLOF) extracts features in adjacent video frames with deep convolutional neural networks. It uses those features to estimate the inter-frame motio…
A Machine Learning Approach to Robustly Determine Director Fields and Analyze Defects in Active Nematics
Yunrui Li, Zahra Zarei, Phu N. Tran +5
Active nematics are dense systems of rodlike particles that consume energy to drive motion at the level of the individual particles. They exist in natural systems like biological t…
Flow states of two dimensional active gels driven by external shear
Wan Luo, Aparna Baskaran, Robert A. Pelcovits +1
Using a minimal hydrodynamic model, we theoretically and computationally study active gels in straight and annular two-dimensional channels subject to an externally imposed shear.…
From Disks to Channels: Dynamics of Active Nematics Confined to an Annulus
Chaitanya Joshi, Zahra Zarei, Michael M. Norton +3
Confinement can be used to systematically tame turbulent dynamics occurring in active fluids. Although periodic channels are the simplest geometries to study confinement numericall…
Design principles for transporting vesicles with enclosed active particles
Sarvesh Uplap, Michael F. Hagan, Aparna Baskaran
We use coarse-grained molecular dynamics simulations to study the motility of a 2D vesicle containing self-propelled rods, as a function of the vesicle bending rigidity and the num…
Spatiotemporal patterning of extensile active stresses in microtubule-based active fluids
Linnea M. Lemma, Minu Varghese, Tyler D. Ross +3
Active stresses, which are collectively generated by the motion of energy-consuming rod-like constituents, generate chaotic autonomous flows. Controlling active stresses in space a…
Data-driven discovery of active nematic hydrodynamics
Chaitanya Joshi, Sattvic Ray, Linnea Lemma +5
Two-dimensional active nematics are often modeled using phenomenological continuum theories that describe the dynamics of the nematic director and fluid velocity through partial di…
Dual antagonistic role of motor proteins in fluidizing active networks
Bibi Najma, Minu Varghese, Lev Tsidilkovski +3
Cells accomplish diverse functions using the same molecular building blocks, from setting up cytoplasmic flows to generating mechanical forces. In particular, transitions between t…
Steady states of active Brownian particles interacting with boundaries
Caleb G. Wagner, Michael F. Hagan, Aparna Baskaran
An active Brownian particle is a minimal model for a self-propelled colloid in a dissipative environment. Experiments and simulations show that, in the presence of boundaries and o…
Vesicle shape transformations driven by confined active filaments
Matthew S. E. Peterson, Aparna Baskaran, Michael F. Hagan
In active matter systems, deformable boundaries provide a mechanism to organize internal active stresses and perform work on the external environment. To study a minimal model of s…
Confinement controlled bend instability of three-dimensional active fluids
Pooja Chandrakar, Minu Varghese, S. Ali Aghvami +3
Spontaneous growth of long-wavelength deformations is a defining feature of active fluids with orientational order. We investigate the effect of biaxial rectangular confinement on…
Confinement-induced Self-Pumping in 3D Active Fluids
Minu Varghese, Arvind Baskaran, Michael Hagan +1
Two dimensional active fluids display a transition from turbulent to coherent flow upon decreasing the size of the confining geometry. A recent experiment suggests that the behavio…
Nonreciprocity as a generic route to traveling states
Zhihong You, Aparna Baskaran, M. Cristina Marchetti
We examine a non-reciprocally coupled dynamical model of a mixture of two diffusing species. We demonstrate that nonreciprocity, which is encoded in the model via antagonistic cros…
Topological structure and dynamics of three dimensional active nematics
Guillaume Duclos, Raymond Adkins, Debarghya Banerjee +13
Point-like motile topological defects control the universal dynamics of diverse two-dimensional active nematics ranging from shaken granular rods to cellular monolayers. A comparab…
Statistical properties of a tangentially driven active filament
Matthew S. E. Peterson, Michael F. Hagan, Aparna Baskaran
Active polymers play a central role in many biological systems, from bacterial flagella to cellular cytoskeletons. Minimal models of semiflexible active filaments have been used to…
Response of active Brownian particles to boundary driving
Caleb G. Wagner, Michael F. Hagan, Aparna Baskaran
We computationally study the behavior of underdamped active Brownian particles in a sheared channel geometry. Due to their underdamped dynamics, the particles carry momentum a char…
Re-enterant efficiency of phototaxis in Chlamydomonas reinhardtii cells
Sujeet Kumar Choudhary, Aparna Baskaran, Prerna Sharma
Phototaxis is one of the most fundamental stimulus-response behaviors in biology wherein motile micro-organisms sense light gradients to swim towards the light source. Apart from s…