7-11 July 2014
Africa/Johannesburg timezone
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Field theory formulation for active network

Presented by Ms. Stanard MEBWE PACHONG on 8 Jul 2014 from 11:30 to 11:50
Type: Oral Presentation
Session: DPCMM1
Track: Track A - Division for Physics of Condensed Matter and Materials

Abstract

We develop a model of a polymer network made of both permanent and reversible cross-links (such as myosin II clusters). The formalism of Edwards for a permanent network is used and, was adapted by Fantoni et al to describe clustering. The combination of these two ideas comprises the model of network resembling a natural network. The interesting point here is that the cross-linkages are random and this constraint is ensured by the field theory. As is well known, the randomness causes severe mathematical challenges. Fortunately, many tools have been developed in order to circumvent this. The network is made by mixing many chains of identical lengths, and two different types of cross-linkers with fixed functionality each. The field theory used for polymer network developed by Edwards provides various approaches to dealing with this kind of cross-linkage problem. Edwards used the well known properties of Gaussian integration over the fields defined for each specific type of cross-linker and solved the field-theory using the saddle point approximation method. We expand the field theoretic model and compute the average density of reversible cross-links along the polymeric chain. The behaviour of the network formed has also been investigated including the activity of the linkers (i.e. when the reversible linker can move and when the permanent linker exerts a force). The result of the calculations lead to derivation of the bulk elastic properties for such systems.

Award

YES

Level

PhD

Supervisor

Kristian Müller-Nedebock kkmn@physics.sun.ac.za, Stellenbosch University

Paper

NO

Place

Room: D Les 201


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