منابع مشابه
Raft instability of biopolymer gels.
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 ...
متن کاملRheology of biopolymer solutions and gels.
Rheological techniques and methods have been employed for many decades in the characterization of polymers. Originally developed and used on synthetic polymers, rheology has then found much interest in the field of natural (bio) polymers. This review concentrates on introducing the fundamentals of rheology and on discussing the rheological aspects and properties of the two major classes of biop...
متن کاملBiopolymer Gels: Nanostructure and Macroscopic Properties
Ferenc Horkay (!) Section on Tissue Biophysics and Biomimetics, Laboratory of Integrative and Medical Biophysics, NICHD, National Institutes of Health, 13 South Drive, Bethesda, MD 20892, USA e-mail: [email protected] Abstract Small-angle neutron scattering (SANS) has been used to investigate the effect of salts (NaCl and CaCl2) on the structure of DNA and polyacrylic acid (PAA) gels. In the...
متن کاملAlignment and nonlinear elasticity in biopolymer gels.
We present a Landau-type theory for the nonlinear elasticity of biopolymer gels with a part of the order parameter describing induced nematic order of fibers in the gel. We attribute the nonlinear elastic behavior of these materials to fiber alignment induced by strain. We suggest an application to contact guidance of cell motility in tissue. We compare our theory to simulation of a disordered ...
متن کاملSimilarities Between Polyelectrolyte Gels and Biopolymer Solutions
Correspondence to: F. Horkay (E-mail: [email protected]) ABSTRACT: Small angle neutron scattering (SANS) measurements and osmotic swelling pressure measurements are reported for polyelectrolyte gels and solutions under nearly physiological conditions. A synthetic polymer (sodium-polyacrylate) and three biopoly mers (DNA, hyaluronic acid, and polyaspartic acid) are studied. The neutron scatt...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2001
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.87.158101