Visualizing the strain field in semiflexible polymer networks: strain fluctuations and nonlinear rheology of F-actin gels

Details Visualizing the strain field in semiflexible polymer networks: strain fluctuations and nonlinear rheology of F-actin gels Visualizing the strain field in semiflexible polymer networks: strain fluctuations and nonlinear rheology of F-actin gels

2007-02-14

arxiv.org/abs/cond-mat/0702323v1

Physics

Condensed Matter

Soft Condensed Matter

9 pages (double-spaced) of text, 4 figures + 1 supplementary figure

Scientific paper

10.1103/PhysRevLett.98.198304

We image semi-flexible polymer networks under shear at the micrometer scale. By tracking embedded probe particles, we determine the local strain field, and directly measure its uniformity, or degree of affineness, on scales of 2-100 micron. The degree of nonaffine strain depends on polymer length and crosslink density, consistent with theoretical predictions. We also find a direct correspondence between the uniformity of the microscale strain and the nonlinear elasticity of the networks in the bulk.

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