Results 11 to 20 of about 3,056 (193)
Defect unbinding in active nematics
Physical Review Letters, 2018 We formulate the statistical dynamics of topological defects in the active nematic phase, formed in two dimensions by a collection of self-driven particles on a substrate.
Bowick, Mark J. +3 more
core +7 more sources
Wrinkling Instability in 3D Active Nematics. [PDF]
Nano Lett, 2020 In nature interactions between biopolymers and motor proteins give rise to biologically essential emergent behaviours. Besides cytoskeleton mechanics, active nematics arise from such interactions. Here we present a study on 3D active nematics made of microtubules, kinesin motors and depleting agent. It shows a rich behaviour evolving from a nematically
Strübing T +5 more
europepmc +11 more sources
Optimal Control of Active Nematics [PDF]
Physical Review Letters, 2020 In this work we present the first systematic framework to sculpt active nematics systems, using optimal control theory and a hydrodynamic model of active nematics. We demonstrate the use of two different control fields, (1) applied vorticity and (2) activity strength, to shape the dynamics of an extensile active nematic that is confined to a disk.
Michael M. Norton +3 more
openaire +5 more sources
Excitable Patterns in Active Nematics [PDF]
Physical Review Letters, 2010 We analyze a model of mutually-propelled filaments suspended in a two-dimensional solvent. The system undergoes a mean-field isotropic-nematic transition for large enough filament concentrations and the nematic order parameter is allowed to vary in space
B. Chakraborty +5 more
core +6 more sources
Multiscale Microtubule Dynamics in Active Nematics [PDF]
Physical Review Letters, 2021 In microtubule-based active nematics, motor-driven extensile motion of microtubule bundles powers chaotic large-scale dynamics. We quantify the interfilament sliding motion both in isolated bundles and in a dense active nematic. The extension speed of an isolated microtubule pair is comparable to the molecular motor stepping speed. In contrast, the net
Linnea M. Lemma +7 more
openaire +5 more sources
Geometry and Topology of Turbulence in Active Nematics
Physical Review X, 2015 The problem of low Reynolds number turbulence in active nematic fluids is theoretically addressed. Using numerical simulations, I demonstrate that an incompressible turbulent flow, in two-dimensional active nematics, consists of an ensemble of vortices ...
Luca Giomi
doaj +2 more sources
Driven active and passive nematics
Molecular Physics, 2015 We investigate similarities in the micro-structural dynamics between externally driven and actively driven nematics. Walls, lines of strong deformations in the director field, and topological defects are characteristic features of an active nematic ...
Golestanian, Ramin +2 more
core +3 more sources
Active Fréedericksz Transition in Active Nematic Droplets
Physical Review XActive nematic liquid crystals have the remarkable ability to spontaneously deform and flow in the absence of any external driving force. While living materials with orientational order, such as the mitotic spindle, can self-assemble in quiescent active ...
Salman Alam +8 more
doaj +3 more sources
Active nematics are intrinsically phase-separated [PDF]
Physical Review Letters, 2006 Two-dimensional nonequilibrium nematic steady states, as found in agitated granular-rod monolayers or films of orientable amoeboid cells, were predicted [Europhys. Lett.
Mishra, Shradha, Ramaswamy, Sriram
core +5 more sources
Mesoscopic simulations of active nematics. [PDF]
Sci Adv, 2022 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 primary interest. Such methods generally model passive solvents; however, far-from-equilibrium systems may also be composed of complex solutes suspended ...
Kozhukhov T, Shendruk TN.
europepmc +4 more sources