Results 81 to 90 of about 2,992 (173)
Long-lived Giant Number Fluctuations in a Swarming Granular Nematic [PDF]
, 2007 Coherently moving flocks of birds, beasts or bacteria are examples of living matter with spontaneous orientational order. How do these systems differ from thermal equilibrium systems with such liquid-crystalline order?
Buhl +12 more
core +1 more source
Emergence of Radial Tree of Bend Stripes in Active Nematics
Physical Review X, 2019 Living liquid crystals, a realization of active nematics where a lyotropic liquid crystal is combined with active bacteria, exhibit a plethora of out-of-equilibrium phenomena that range from active turbulence and dynamic spatiotemporal patterns to the ...
Andrey Sokolov +4 more
doaj +1 more source
Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles [PDF]
, 2002 We construct the hydrodynamic equations for {\em suspensions} of self-propelled particles (SPPs) with spontaneous orientational order, and make a number of striking, testable predictions:(i) SPP suspensions with the symmetry of a true {\em nematic} are {\
A. Huth +11 more
core +2 more sources
Active nematic materials with substrate friction [PDF]
Physical Review E, 2014 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.
Sumesh P. Thampi +2 more
openaire +4 more sources
Instabilities and chaos in a kinetic equation for active nematics
New Journal of Physics, 2014 We study dry active nematics at the kinetic equation level, stressing the differences with the well-known Doi theory for non-active rods near thermal equilibrium.
Xia-qing Shi, Hugues Chaté, Yu-qiang Ma
doaj +1 more source
Topology and Dynamics of Active Nematic Vesicles
, 2014 Engineering synthetic materials that mimic the remarkable complexity of living organisms is a fundamental challenge in science and technology. We study the spatiotemporal patterns that emerge when an active nematicfilm of microtubules and molecular ...
Bausch, Andreas R. +8 more
core +2 more sources
Active nematics in corrugated channels
Soft MatterIn corrugated channels, active nematics transition from counter-rotating swirls to coherent flows. Swirling structures in the corrugations facilitate slip, lowering the critical activity needed for the transition.
Jaideep P. Vaidya +2 more
openaire +3 more sources
Minimal model for active nematics: quasi-long-range order and giant fluctuations
, 2006 We propose a minimal microscopic model for active nematic particles similar in spirit to the Vicsek model for self-propelled polar particles. In two dimensions, we show that this model exhibits a Kosterlitz-Thouless-like transition to quasi-long-range ...
Francesco Ginelli +4 more
core +1 more source
Dynamic structure of active nematic shells [PDF]
Nature Communications, 2016 AbstractWhen a thin film of active, nematic microtubules and kinesin motor clusters is confined on the surface of a vesicle, four +1/2 topological defects oscillate in a periodic manner between tetrahedral and planar arrangements. Here a theoretical description of nematics, coupled to the relevant hydrodynamic equations, is presented here to explain ...
Rui Zhang +3 more
openaire +4 more sources
Vortex formation and dynamics of defects in active nematic shells
New Journal of Physics, 2017 We present a hydrodynamic model for a thin spherical shell of active nematic liquid crystal with an arbitrary configuration of defects. The active flows generated by defects in the director lead to the formation of stable vortices, analogous to those ...
Diana Khoromskaia, Gareth P Alexander
doaj +1 more source