Nonlinear elasticity of composite networks of stiff biopolymers with flexible linkers

Details Nonlinear elasticity of composite networks of stiff biopolymers with flexible linkers Nonlinear elasticity of composite networks of stiff biopolymers with flexible linkers

2007-10-21

arxiv.org/abs/0710.3951v3

Phys. Rev. Lett. 101, 118103 (2008)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.118103

Motivated by recent experiments showing nonlinear elasticity of in vitro networks of the biopolymer actin cross-linked with filamin, we present an effective medium theory of flexibly cross-linked stiff polymer networks. We model such networks by randomly oriented elastic rods connected by flexible connectors to a surrounding elastic continuum, which self-consistently represents the behavior of the rest of the network. This model yields a crossover from a linear elastic regime to a highly nonlinear elastic regime that stiffens in a way quantitatively consistent with experiment.

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