Permeation Instabilities in Active, Polar Gels
arXiv:2104.08325 · doi:10.1103/PhysRevLett.127.188001
Abstract
We present a theory of active, permeating, polar gels, based on a two-fluid model. An active relative force between the gel components creates a steady-state current. We analyze its stability, while considering two polar coupling terms to the relative current: a permeation-deformation term, which describes network deformation by the solvent flow, and a permeation-alignment term, which describes the alignment of the polarization field by the network deformation and flow. Novel instability mechanisms emerge at finite wave vectors, suggesting the formation of periodic domains and mesophases. Our results can be used to determine the physical conditions required for various types of multicellular migration across tissues.
arXiv comment16 pages, 2 figures (Supplemental Material included)
References in corpus (10)
- Generic theory of active polar gels: a paradigm for cytoskeletal dynamics
- Spontaneous flow transition in active polar gels
- Generic phase diagram of active polar films
- Active nematics are intrinsically phase-separated
- Active Gel Model of Amoeboid Cell Motility
- Oriented Active Solids
- Active Viscoelastic Matter: from Bacterial Drag Reduction to Turbulent Solids
- Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics
- Shear-induced first-order transition in polar liquid crystals
- Hydrodynamics of Active Polar Systems in a (Visco)Elastic Background