Results 81 to 90 of about 4,761,499 (204)
Topology and dynamics of active nematic vesicles [PDF]
Science, 2014 Liquid crystals on a deformable substrate The orientation of the molecules in a liquid crystalline material will change in response to either changes in the substrate or an external field. This is the basis for liquid crystalline devices. Vesicles, which are fluid pockets surrounded by lipid bilayers, will change size or shape in
Keber, F. +8 more
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Excitable Patterns in Active Nematics
Physical Review Letters, 2011 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 and time.
Giomi, Luca +3 more
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Mesoscopic theory for fluctuating active nematics
New Journal of Physics, 2013 The term active nematics designates systems in which apolar elongated particles spend energy to move randomly along their axis and interact by inelastic collisions in the presence of noise.
Eric Bertin +5 more
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Defect self-propulsion in active nematic films with spatially varying activity
Royal Society Open Science, 2023 We study the dynamics of topological defects in active nematic films with spatially varying activity and consider two set-ups: (i) a constant activity gradient and (ii) a sharp jump in activity.
Jonas Rønning +2 more
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Understanding Dense Active Nematics from Microscopic Models [PDF]
, 2019 We study dry, dense active nematics at both particle and continuous levels. Specifically, extending the Boltzmann-Ginzburg-Landau approach, we derive well-behaved hydrodynamic equations from a Vicsek-style model with nematic alignment and pairwise ...
Patelli, Aurelio +6 more
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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. {\bf 62} (2003) 196] to have giant number fluctuations, with standard deviation proportional to the mean.
Mishra, Shradha, Ramaswamy, Sriram
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A unified field theory of topological defects and non-linear local excitations
npj Computational Materials, 2023 Topological defects and smooth excitations determine the properties of systems showing collective order. We introduce a generic non-singular field theory that comprehensively describes defects and excitations in systems with O(n) broken rotational ...
Vidar Skogvoll +3 more
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Hydrodynamics of Active Defects: From Order to Chaos to Defect Ordering
Physical Review X, 2019 Topological defects play a prominent role in the physics of two-dimensional materials. When driven out of equilibrium in active nematics, disclinations can acquire spontaneous self-propulsion and drive self-sustained flows upon proliferation.
Suraj Shankar, M. Cristina Marchetti
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Quadrupolar active stress induces exotic phases of defect motion in active nematics
, 2021 A wide range of living and artificial active matter exists in close contact with substrates and under strong confinement, where in addition to dipolar active stresses, quadrupolar active stresses can become important. Here, we numerically investigate the
Nejad, Mehrana R. +2 more
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Development of smoothed particle hydrodynamics method for modeling active nematics
, 2023 This article proposes a novel graphics processing unit-based active nematic flow solver based on the smoothed particle hydrodynamics (SPH) method. Nematohydrodynamics equations are discretized using the SPH algorithm.
Saghatchi, Roozbeh +5 more
core +1 more source