Results 101 to 110 of about 2,992 (173)

Negative stiffness and modulated states in active nematics

, 2016
We examine the dynamics of a compressible active nematic liquid crystal on a frictional substrate. When frictional damping dominates over viscous dissipation, we eliminate flow in favor of active stresses to obtain a minimal dynamical model for the ...
Marchetti, M. Cristina, Mishra, Prashant, Srivastava, Pragya   +2 more
core   +1 more source

Pattern Formation from Defect Chaos --- A Theory of Chevrons

, 1997
For over 25 years it is known that the roll structure of electroconvection (EC) in the dielectric regime in planarly aligned nematic liquid crystals has, after a transition to defect chaos, the tendency to form chevron structures.
Kramer, L., Rossberg, A. G.
core   +1 more source

The importance of being discrete: fluctuations, defects, and density-orientation coupling in agent-based active nematics

New Journal of Physics
We propose an agent-based model of active flexible rods. Inspired by cytoskeletal flows, we introduce activity by an internal flow that contributes to the dissipative forces.
M Dedenon, C Blanch-Mercader, K Kruse, J Elgeti   +3 more
doaj   +1 more source

Application of retardation-modulation polarimetry in studies of nanocomposite materials

, 2019
We demonstrate an application of retardation-modulation polarimetry in studies of nanocomposite materials. Molecular ordering is explored on both nonchiral and chiral liquid crystals (LCs) in the bulk state and embedded into parallel-arrays of ...
Andrushchak, Anatoliy, Huber, Patrick, Kityk, Andriy V., Kula, Przemysław, Piecek, Wiktor   +4 more
core   +1 more source

Physically informed data-driven modeling of active nematics. [PDF]

Sci Adv, 2023
Golden M, Grigoriev RO, Nambisan J, Fernandez-Nieves A.   +3 more
europepmc   +1 more source

Mitigating density fluctuations in particle-based active nematic simulations

Communications Physics
Understanding active matter has led to new perspectives on biophysics and non-equilibrium dynamics. However, the development of numerical tools for simulating active fluids capable of incorporating non-trivial boundaries or inclusions has lagged behind ...
Timofey Kozhukhov, Benjamin Loewe, Tyler N. Shendruk   +2 more
doaj   +1 more source

Topology of Three-Dimensional Active Nematic Turbulence Confined to Droplets

Physical Review X, 2019
Active nematics contain topological defects that (under sufficient activity) move, create, and annihilate in a chaotic quasi-steady state, called active turbulence.
Simon Čopar, Jure Aplinc, Žiga Kos, Slobodan Žumer, Miha Ravnik   +4 more
doaj   +1 more source

Photosynthetically-powered phototactic active nematic liquid crystal fluids and gels

Communications Materials
One of the most ancient forms of life dating to ~3.5 billion years ago, cyanobacteria are highly abundant organisms that convert light into energy and motion, often within conjoined filaments and larger colonies that attract a great deal of interest but ...
Andrii Repula, Colin Gates, Jeffrey C. Cameron, Ivan I. Smalyukh   +3 more
doaj   +1 more source

Learning active nematics one step at a time. [PDF]

Proc Natl Acad Sci U S A, 2021
Frishman A, Keren K.
europepmc   +1 more source

Orientational ordering in active nematic solids

ArXiv
In vivo and in vitro systems of cells and extra-cellular matrix (ECM) systems are well known to form ordered patterns of orientationally aligned fibers. Here, we interpret them as active analogs of the (disordered) isotropic to the (ordered) nematic phase transition seen in passive liquid crystalline elastomers.
Yang, Haiqian, Guo, Ming, Mahadevan, L.
openaire   +3 more sources