Raft Instability of Biopolymer Gels

Details Raft Instability of Biopolymer Gels Raft Instability of Biopolymer Gels

2002-09-13

arxiv.org/abs/cond-mat/0209332v1

Phys. Rev. Lett. 87, 158101 (2001)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.158101

Following recent X-ray diffraction experiments by Wong, Li, and Safinya on biopolymer gels, we apply Onsager excluded volume theory to a nematic mixture of rigid rods and strong ``$\pi/2$'' cross-linkers obtaining a long-ranged, highly anisotropic depletion attraction between the linkers. This attraction leads to breakdown of the percolation theory for this class of gels, to breakdown of Onsager's second-order virial method, and to formation of heterogeneities in the form of raft-like ribbons.

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