Results 11 to 20 of about 12,892 (173)
Dynamic structure of active nematic shells [PDF]
Nature Communications, 2016 In active matter, chemical energy is transformed into mechanical motion; theoretical descriptions of nematic liquids are useful in understanding such phenomena. Here, Zhang et al.
Rui Zhang +3 more
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Defect unbinding in active nematics
Physical Review Letters, 2018 We formulate the statistical dynamics of topological defects in the active nematic phase, formed in two dimensions by a collection of self-driven particles on a substrate.
Bowick, Mark J. +3 more
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Excitable Patterns in Active Nematics [PDF]
Physical Review Letters, 2010 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
B. Chakraborty +5 more
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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
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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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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
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Topology and Dynamics of Active Nematic Vesicles
Science, 2014 Engineering synthetic materials that mimic the remarkable complexity of living organisms is a fundamental challenge in science and technology. We study the spatiotemporal patterns that emerge when an active nematicfilm of microtubules and molecular ...
Bausch, Andreas R. +8 more
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Active Fréedericksz Transition in Active Nematic Droplets
Physical Review XActive nematic liquid crystals have the remarkable ability to spontaneously deform and flow in the absence of any external driving force. While living materials with orientational order, such as the mitotic spindle, can self-assemble in quiescent active ...
Salman Alam +8 more
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Topology of Three-Dimensional Active Nematic Turbulence Confined to Droplets
Physical Review X, 2019 Active nematics contain topological defects that (under sufficient activity) move, create, and annihilate in a chaotic quasi-steady state, called active turbulence.
Simon Čopar +4 more
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Machine learning active-nematic hydrodynamics [PDF]
Proceedings of the National Academy of Sciences, 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 ...
Jonathan Colen +12 more
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