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  • Title: Simulations of dynamics and viscoelasticity in highly entangled solutions of semiflexible rods.
    Author: Ramanathan S, Morse DC.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2007 Jul; 76(1 Pt 1):010501. PubMed ID: 17677401.
    Abstract:
    Brownian dynamics simulations are used to study highly entangled solutions of semiflexible polymers. Bending fluctuations of semiflexible rods are significantly affected by entanglement only above a concentration c(**), where c(**) approximately 10(3)L(-3) for chains of length L similar to their persistence length. For c>c(**), the tube radius R(e) approaches a dependence R(e) proportional to c(-35) and the linear viscoelastic response develops an elastic plateau that is absent for c<c(**). Experiments on isotropic solutions of F-actin are shown to span concentrations near c(**) for which the predicted asymptotic scaling of the plateau modulus, G proportional to c(75), is not yet valid.
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