Defect dynamics in active nematics

Abstract

Topological defects are distinctive signatures of liquid crystals. They profoundly affect the viscoelastic behavior of the fluid by constraining the orientational structure in a way that inevitably requires global changes not achievable with any set of local deformations. In active nematic liquid crystals topological defects not only dictate the global structure of the director, but also act as local sources of motion, behaving as self-propelled particles. In this article we present a detailed analytical and numerical study of the mechanics of topological defects in active nematic liquid crystals.

16 pages, 10 figures

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Cited by in corpus (118)

• Active Turbulence
• Topological structure and dynamics of three dimensional active nematics
• Topological defects promote layer formation in Myxococcus xanthus colonies
• Turbulent dynamics of epithelial cell cultures
• Emergence of active nematic behaviour in monolayers of isotropic cells
• Taming active turbulence with patterned soft interfaces
• Data-driven quantitative modeling of bacterial active nematics
• Structuring Stress for Active Materials Control
• Vorticity, Defects and Correlations in Active Turbulence
• Defect unbinding in active nematics
• Universal scaling of active nematic turbulence
• Bacteria solve the problem of crowding by moving slowly
• Theory of defect-mediated morphogenesis
• Correlation lengths in hydrodynamic models of active nematics
• Dynamically Generated Patterns in Dense Suspensions of Active Filaments
• Machine learning active-nematic hydrodynamics
• Active turbulence in active nematics
• Orientational properties of nematic disclinations
• Lattice Boltzmann Methods and Active Fluids
• Insensitivity of active nematic dynamics to topological constraints
• Polar jets of swimming bacteria condensed by a patterned liquid crystal
• Cross-talk between topological defects in different fields revealed by nematic microfluidics
• Probing the shear viscosity of an active nematic
• Three-Dimensional Active Defect Loops
• Geometrical control of active turbulence in curved topographies
• Design of nematic liquid crystals to control microscale dynamics
• Vortex formation and dynamics of defects in shells of active nematics
• Geometry and mechanics of disclination lines in 3D nematic liquid crystals
• Multiscale modeling and simulation of microtubule/motor protein assemblies
• Understanding dense active nematics from microscopic models
• Active Viscoelastic Matter: from Bacterial Drag Reduction to Turbulent Solids
• Twist-induced crossover from 2D to 3D turbulence in active nematics
• Theory of defect motion in 2D passive and active nematic liquid crystals
• Wrinkling instability in 3D active nematics
• Emergent Structures in an Active Polar Fluid : dynamics of shape, scattering and merger
• Data-driven discovery of active nematic hydrodynamics
• Integer topological defects of cell monolayers -- mechanics and flows
• Spontaneous rotation can stabilise ordered chiral active fluids
• Vortex dynamics and Lagrangian statistics in a model for active turbulence
• Role of friction in multidefect ordering
• Motility of active fluid drops on surfaces
• Pair creation, motion, and annihilation of topological defects in 2D nematics
• Chiral stresses in nematic cell monolayers
• Multiphase field models for collective cell migration
• The role of fluid flow in the dynamics of active nematic defects
• Spontaneous Self-Constraint in Active Nematic Flows
• Mesoscopic Simulations of Active-Nematics
• Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics
• Cascade or not cascade? Energy transfer and elastic effects in active nematics
• Molecular-scale substrate anisotropy and crowding drive long-range nematic order of cell monolayers
• Dynamics of active nematic defects on the surface of a sphere
• Spectral energy analysis of bulk three-dimensional active nematic turbulence
• Polar Fluctuations Lead to Extensile Nematic Behavior in Confluent Tissues
• Microbial Active Matter: A Topological Framework
• Designing, Synthesizing and Modeling Active Fluids
• Inertia drives a flocking phase transition in viscous active fluids
• Orientational correlations in active and passive nematic defects
• Rheology of active polar emulsions: from linear to unidirectional and unviscid flow, and intermittent viscosity
• Probing active nematics with in-situ microfabricated elastic inclusions
• Geometry and mechanics of microdomains in growing bacterial colonies
• Active Matter Invasion
• Driven active and passive nematics
• Properties of twisted topological defects in 2D nematic liquid crystals
• Morphodynamics of Active Nematic Fluid Surfaces
• Defects Superdiffusion and Unbinding in a 2D XY Model of Self-Driven Rotors
• Motile topological defects hinder dynamical arrest in dense liquids of active ellipsoids
• Defect Line Coarsening and Refinement in Active Nematics
• Binding self-propelled topological defects in active turbulence
• Defect order in active nematics on a curved surface
• Coexistence of active and hydrodynamic turbulence in two dimensional active nematics
• Asymmetric fluctuations and self-folding of active interfaces
• Soft channel formation and symmetry breaking in exotic active emulsions
• Flow around topological defects in active nematic films
• The role of advective inertia in active nematic turbulence
• Dynamical Sub-classes of Dry Active Nematics
• Vortex Flows and Streamline Topology in Curved Biological Membranes
• Fluctuation-induced dynamics of nematic topological defects
• Defect Loops in Three-Dimensional Active Nematics as Active Multipoles
• Vortex Lattices in Active Nematics with Periodic Obstacle Arrays
• Catapulting of topological defects through elasticity bands in active nematics
• Hydrodynamic Enhancement of $p$-atic Defect Dynamics
• Chirality, anisotropic viscosity and elastic anisotropy in three-dimensional active nematic turbulence
• Thin film models for active gels
• Polar swimmers induce several phases in active nematics
• Active nematic defects in compressible and incompressible flows
• Friction mediated phase transition in confined active nematics
• Many-defect solutions in planar nematics: interactions, spiral textures and boundary conditions
• Frank-Read Mechanism in Nematic Liquid Crystals
• Nonlinear spontaneous flow instability in active nematics
• Optimal Control in Soft and Active Matter
• Active Nematic Multipoles: Flow Responses and the Dynamics of Defects and Colloids
• Closed-loop control of active nematic flows
• Self-propulsion of an active polar drop
• Cells around the corner
• Density-polarity coupling in confined active polar films: asters, spirals, and biphasic orientational phases
• Active topological defect absorption by a curvature singularity
• Machine learning topological defects in confluent tissues
• Analytical model for the motion and interaction of two-dimensional active nematic defects
• Topological signatures of collective dynamics and turbulent-like energy cascades in apolar active granular
• Elasticity tunes mechanical stress localization around active topological defects
• Spontaneous rotation and propulsion of suspended capsules in active nematics
• Turbulence to order transitions in activity patterned active nematics
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• Phase Separation in Mixtures of Nematic and Isotropic Fluids
• Stress and Alignment Response to Curved Obstacles in Growing Bacterial Monolayers
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• Irreversibility in scalar active turbulence: The role of topological defects
• Spontaneous flow created by active topological defects
• Orientational order and topological defects in a dilute solutions of rodlike polymers at low Reynolds number
• Aspect-ratio-dependent void formation in active rhomboidal and elliptical particle systems
• Active nematics in corrugated channels
• The importance of being discrete -- An agent-based model for active nematics and more
• Memory effects, arches and polar defect ordering at the cross-over from wet to dry active nematics
• Collective epithelial migration mediated by the unbinding of hexatic defects
• On the temperature of an active nematic
• Myofibroblasts slow down defect recombination dynamics in mixed cell monolayers
• Filamentous Active Matter: Band Formation, Bending, Buckling, and Defects
• Dynamical arrest in active nematic turbulence