Results 61 to 70 of about 2,992 (173)
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
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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
Active forces modulate collective behaviour and cellular organization
Comptes Rendus Biologies, 2021 Biological tissues are composed of various cell types working cooperatively to perform their respective function within organs and the whole body.
Balasubramaniam, Lakshmi +2 more
doaj +1 more source
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
core +3 more sources
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
Taming active turbulence with patterned soft interfaces
Nature Communications, 2017 Active nematics consist of self-driven components that develop orientational order and turbulent flow. Here Guillamat et al. investigate an active nematic constrained in a quasi-2D geometrical setup and show that there exists an intrinsic length scale ...
P. Guillamat +2 more
doaj +1 more source
Physical Review Research, 2021 Understanding the emergent nonequilibrium dynamics of collective units is crucial for steering and engineering active many-body systems. Here, we explore flow transitions and topological defect dynamics of channel-confined active nematics under chiral ...
Zhong-Yi Li, De-Qing Zhang, Bo Li
doaj +1 more source
Orientational properties of nematic disclinations
, 2016 Topological defects play a pivotal role in the physics of liquid crystals and represent one of the most prominent and well studied aspects of mesophases.
Alexander +35 more
core +2 more sources
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
Large-scale collective properties of self-propelled rods [PDF]
, 2009 We study, in two space dimensions, the large-scale properties of collections of constant-speed polar point particles interacting locally by nematic alignment in the presence of noise.
Baer, M. +3 more
core +4 more sources