Results 51 to 60 of about 3,056 (193)
Colloids in two-dimensional active nematics: conformal cogs and controllable spontaneous rotation
New Journal of Physics, 2023 A major challenge in the study of active systems is to harness their non-equilibrium dynamics into useful work. We address this by showing how to design colloids with controllable spontaneous propulsion or rotation when immersed in active nematics.
Alexander J H Houston +1 more
doaj +1 more source
Active Nematic Flows over Curved Surfaces
Physical Review Letters, 2022 5 pages, 3 figures, 20 supplemental pages, 11 supplemental figures, 2 supplemental ...
Samuel Bell +3 more
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Complex Spontaneous Flows and Concentration Banding in Active Polar Films [PDF]
, 2008 We study the dynamical properties of active polar liquid crystalline films. Like active nematic films, active polar films undergo a dynamical transitions to spontaneously flowing steady-states.
Giomi, Luca +2 more
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Active Nematic Defects and Epithelial Morphogenesis
Physical Review Letters, 2022 Inspired by recent experiments that highlight the role of nematic defects in the morphogenesis of epithelial tissues, we develop a minimal framework to study the dynamics of an active curved surface driven by its nematic texture. Allowing the surface to evolve via relaxational dynamics leads to a theory linking nematic defect dynamics, cellular ...
Farzan Vafa, L. Mahadevan
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Defect order in active nematics on a curved surface
New Journal of Physics, 2020 We investigate the effects of extrinsic curvature on the turbulent behavior of a 2D active nematic confined to the surface of a cylinder. The surface of a cylinder has no intrinsic curvature and only extrinsic curvature.
D J G Pearce
doaj +1 more source
Passive Janus particles are self-propelled in active nematics
New Journal of Physics, 2022 While active systems possess notable potential to form the foundation of new classes of autonomous materials (Zhang et al 2021 Nat. Rev. Mater. 6 437), designing systems that can extract functional work from active surroundings has proven challenging. In
Benjamin Loewe, Tyler N Shendruk
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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
Velocity Correlations in an Active Nematic [PDF]
Physical Review Letters, 2013 The flow properties of a continuum model for an active nematic is studied and compared with recent experiments on suspensions of microtubule bundles and molecular motors. The velocity correlation length is found to be independent of the strength of the activity while the characteristic velocity scale increases monotonically as the activity is increased,
Sumesh P. Thampi +2 more
openaire +4 more sources
Proceedings of the National Academy of SciencesMicrofluidics involves the manipulation of flows at the microscale, typically requiring external power sources to generate pressure gradients. Alternatively, harnessing flows from active fluids, which are usually chaotic, has been proposed as a paradigm for the development of micromachines.
Ignasi Vélez-Cerón +6 more
openaire +3 more sources
Antipolar ordering of topological defects in active liquid crystals [PDF]
, 2016 ATP-driven microtubule-kinesin bundles can self-assemble into two-dimensional active liquid crystals (ALCs) that exhibit a rich creation and annihilation dynamics of topological defects, reminiscent of particle-pair production processes in quantum ...
Dunkel, Jörn, Oza, Anand U.
core +2 more sources