Results 61 to 70 of about 3,056 (193)
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
doaj +1 more source
Hydrodynamic theory for nematic shells: the interplay among curvature, flow and alignment [PDF]
, 2016 We derive the hydrodynamic equations for nematic liquid crystals lying on curved substrates. We invoke the Lagrange-Rayleigh variational principle to adapt the Ericksen-Leslie theory to two-dimensional nematics in which a degenerate anchoring of the ...
Napoli, Gaetano, Vergori, Luigi
core +2 more sources
Dynamical subclasses of dry active nematics [PDF]
Physical Review E, 2019 5 pages, 4 figures.
Cai, Li-Bing +3 more
openaire +4 more sources
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
doaj +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
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
doaj +1 more source
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
openaire +3 more sources
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 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
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