Results 21 to 30 of about 4,695,040 (225)
Active boundary layers in confined active nematics
Nature Communications, 2022 The boundary of conventional liquid crystals is known to anchor the orientational field of the passive materials under equilibrium conditions. Here, the authors show an active nematic to develop active boundary layers that topologically polarize the ...
Jerôme Hardoüin +5 more
doaj +4 more sources
Morphodynamics of active nematic fluid surfaces [PDF]
Journal of Fluid Mechanics, 2022 Morphodynamic equations governing the behaviour of active nematic fluids on deformable curved surfaces are constructed in the large deformation limit. Emphasis is placed on the formulation of objective rates that account for normal deformations whilst ...
S. Al-Izzi, R. G. Morris
semanticscholar +4 more sources
Photosynthetically-powered phototactic active nematic liquid crystal fluids and gels
Communications MaterialsOne of the most ancient forms of life dating to ~3.5 billion years ago, cyanobacteria are highly abundant organisms that convert light into energy and motion, often within conjoined filaments and larger colonies that attract a great deal of interest but ...
Andrii Repula +3 more
doaj +2 more sources
Dynamical arrest in active nematic turbulence
Physical Review ResearchActive fluids display spontaneous turbulentlike flows known as active turbulence. Recent work revealed that these flows have universal features, independent of the material properties and of the presence of topological defects.
Ido Lavi +3 more
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Variational formulation of active nematic fluids: theory and simulation
New Journal of Physics, 2023 The structure and dynamics of important biological quasi-two-dimensional systems, ranging from cytoskeletal gels to tissues, are controlled by nematic order, flow, defects and activity.
W Mirza +3 more
doaj +2 more sources
Machine learning active-nematic hydrodynamics. [PDF]
Proc Natl Acad Sci U S A, 2021 Hydrodynamic theories effectively describe many-body systems out of equilibrium in terms of a few macroscopic parameters. However, such parameters are difficult to determine from microscopic information. Seldom is this challenge more apparent than in active matter, where the hydrodynamic parameters are in fact fields that encode the distribution of ...
Colen J +13 more
europepmc +8 more sources
Closed-Loop Control of Active Nematic Flows
Physical Review XStabilizing and shaping autonomous flows of active fluids is a fundamental challenge and a prerequisite for applications. We embed a light-responsive microtubule-based nematic in a proportional-integral control loop that adjusts the applied light ...
Katsu Nishiyama +8 more
doaj +2 more sources
Active nematic emulsions. [PDF]
Sci Adv, 2018 Droplets of active fluid form a dynamically self-assembled material based on the cross-talk between active and passive defects.
Guillamat P +5 more
europepmc +6 more sources
Spontaneous self-constraint in active nematic flows [PDF]
Nature Physics, 2023 Active flows in biological systems swirl. A coupling between active flows, elongated deformations and defect dynamics helps preserve self-organised structures against disordered swirling.
L. Head +9 more
semanticscholar +1 more source
Periodic orbits, pair nucleation, and unbinding of active nematic defects on cones. [PDF]
Physical Review E, 2023 Geometric confinement and topological constraints present promising means of controlling active materials. By combining analytical arguments derived from the Born-Oppenheimer approximation with numerical simulations, we investigate the simultaneous ...
Farzan Vafa +2 more
semanticscholar +1 more source