Active nematic materials with substrate friction.

  title={Active nematic materials with substrate friction.},
  author={Sumesh P. Thampi and Ramin Golestanian and Julia M. Yeomans},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={90 6},
Active turbulence in dense active systems is characterized by high vorticity on a length scale that is large compared to that of individual entities. We describe the properties of active turbulence as momentum propagation is screened by frictional damping. As friction is increased, the spacing between the walls in the nematic director field decreases as a consequence of the more rapid velocity decays. This leads to, first, a regime with more walls and an increased number of topological defects… 

Pattern Formation in Active Nematics

This thesis presents analytical and numerical studies of the nonequilibrium dynamics of active nematic liquid crystals. Active nematics are a new class of liquid crystals consisting of elongated

Channel Confined Active Nematics

Mesoscopic simulations of active nematics

Coarse-grained, mesoscale simulations are invaluable for studying soft condensed matter because of their ability to model systems in which a background solvent plays a substantial role but is not the

Bacterial active matter

  • I. Aranson
  • Engineering
    Reports on progress in physics. Physical Society
  • 2022
Bacteria are among the oldest and most abundant species on Earth. Bacteria successfully colonize diverse habitats and play a significant role in the oxygen, carbon, and nitrogen cycles. They also

Boundaries control active channel flows

Boundary conditions dictate how fluids, including liquid crystals, flow when pumped through a channel. Can boundary conditions also be used to control internally driven active fluids that generate

Physically-informed data-driven modeling of active nematics

A continuum description is essential for understanding a variety of collective phenomena in active matter. However, building quantitative continuum models of active matter from first principles can be

Active Turbulence

Active fluids exhibit spontaneous flows with complex spatiotemporal structure, which have been observed in bacterial suspensions, sperm cells, cytoskeletal suspensions, self-propelled colloids, and

Machine learning forecasting of active nematics.

A deep learning approach is developed that uses a Convolutional Long-Short-Term-Memory (ConvLSTM) algorithm to automatically learn and forecast the dynamics of active nematics.

Pattern Formation and Defect Ordering in Active Chiral Nematics.

It is shown that coordinated individual spin and motility can engender a vortex-array pattern with chirality and drive ordering of topological defects, which sheds light on the chiral morphodynamics in life processes and also suggests a potential route towards tuning self-organization in active materials.

Confinement Controls the Bend Instability of Three-Dimensional Active Liquid Crystals.

This work investigates the effect of confinement on the instability of 3D active liquid crystals in the isotropic phase composed of extensile microtubule bundles and kinesin molecular motors and demonstrates that confinement determines the structure and dynamics of active fluids on all experimentally accessible length scales.