Dynamics of semiflexible polymer solutions in the highly entangled regime

Tassieri, M. , Evans, R., Barbu-Tudoran, L., Khaname, G., Trinick, J. and Waigh, T. (2008) Dynamics of semiflexible polymer solutions in the highly entangled regime. Physical Review Letters, 101(19), (doi:10.1103/PhysRevLett.101.198301)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.101.198301

Abstract

We present experimental evidence that the effective medium approximation (EMA), [D. C. Morse, Phys. Rev. E 63, 031502 (2001)], provides the correct scaling law of the plateau modulus G0∝ρ4/3Lp-1/3 (with ρ the contour length per unit volume and Lp the persistence length) of semiflexible polymer solutions, in the highly entangled regime. Competing theories, including a binary collision approximation (BCA), instead predict G0∝ρ7/5Lp-1/5. We have tested both predictions using F-actin solutions which permit experimental control of Lp independently of other parameters. A combination of video particle tracking microrheology and dynamic light scattering yields independent measurements of G0 and Lp, respectively. Thus we can distinguish between the two proposed laws, in contrast to previous experimental studies focused on the (less discriminating) concentration dependence.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Tassieri, Dr Manlio
Authors: Tassieri, M., Evans, R., Barbu-Tudoran, L., Khaname, G., Trinick, J., and Waigh, T.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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