Results 51 to 60 of about 12,892 (173)
Spontaneous topological charging of tactoids in a living nematic
New Journal of Physics, 2018 Living nematic is a realization of an active matter combining a nematic liquid crystal with swimming bacteria. The material exhibits a remarkable tendency towards spatio-temporal self-organization manifested in formation of dynamic textures of self ...
Mikhail M Genkin +2 more
doaj +1 more source
Instabilities and Topological Defects in Active Nematics
, 2013 We study a continuum model of an extensile active nematic to show that mesoscale turbulence develops in two stages: (i) ordered regions undergo an intrinsic hydrodynamic instability generating walls, lines of stong bend deformations, (ii) the walls relax
Golestanian, Ramin +2 more
core +1 more source
Pair creation, motion, and annihilation of topological defects in 2D nematics [PDF]
, 2017 We present a novel framework for the study of disclinations in two-dimensional active nematic liquid crystals, and topological defects in general. The order tensor formalism is used to calculate exact multi-particle solutions of the linearized static ...
Cortese, Dario +2 more
core +3 more sources
Photonics, 2023 A chiral nematic is embedded between multilayer mirrors to obtain voltage-inducible polarized resonance spectra. Initially, the nematic director is uniformly oriented perpendicular to the mirrors’ surfaces because the chiral nematic helix is completely ...
Vladimir A. Gunyakov +4 more
doaj +1 more source
Maximally mixing active nematics
Physical Review EActive nematics are an important new paradigm in soft condensed matter systems. They consist of rod-like components with an internal driving force pushing them out of equilibrium. The resulting fluid motion exhibits chaotic advection, in which a small patch of fluid is stretched exponentially in length.
Kevin A. Mitchell +5 more
openaire +3 more sources
Collective chemotaxis of active nematic droplets [PDF]
Physical Review E, 2020 Collective chemotaxis plays a key role in the navigation of cell clusters in, e.g., embryogenesis and cancer metastasis. Using the active nematic continuum equations, coupled to a chemical field that regulates activity, we demonstrate and explain a physical mechanism that results in collective chemotaxis.
Hughes, Rian, Yeomans, Julia M.
openaire +2 more sources
Nematic order by elastic interactions and cellular rigidity sensing
, 2010 We predict spontaneous nematic order in an ensemble of active force generators with elastic interactions as a minimal model for early nematic alignment of short stress fibers in non-motile, adhered cells. Mean-field theory is formally equivalent to Maier-
Friedrich, Benjamin M. +1 more
core +1 more source
Active nematic gels as active relaxing solids [PDF]
Physical Review E, 2017 I put forward a continuum theory for active nematic gels, defined as fluids or suspensions of orientable rodlike objects endowed with active dynamics, that is based on symmetry arguments and compatibility with thermodynamics. The starting point is our recent theory that models (passive) nematic liquid crystals as relaxing nematic elastomers.
openaire +4 more sources
Active nematics on a substrate: giant number fluctuations and long-time tails [PDF]
, 2002 We construct the equations of motion for the coupled dynamics of order parameter and concentration for the nematic phase of driven particles on a solid surface, and show that they imply (i) giant number fluctuations, with a standard deviation ...
+18 more
core +2 more sources
Actuating and Sensing Composites of Liquid Crystal Elastomers and Poly(ionic liquid)s
Advanced Functional Materials, EarlyView.Ionic conductive, mechanically tough, flexible, and stretchable filaments of a composite material comprising a liquid crystal elastomer and a poly(ionic liquid) are produced through 3D printing, which exhibit large actuation strain under stimulation and electrical resistance variation in response to deformation or environmental condition changes. Their
Zeping Liu +6 more
wiley +1 more source