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On the friction coefficient of straight-chain aggregates

Lookup NU author(s): Dr Yannis Drossinos

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Abstract

A methodology to calculate the friction coefficient of an aggregate in the continuum regime is proposed. The friction coefficient and the monomer shielding factors, aggregate-average or individual, are related to the molecule-aggregate collision rate that is obtained from the molecular diffusion equation with an absorbing boundary condition on the aggregate surface. Calculated friction coefficients of straight chains are in very good agreement with previous results, suggesting that the friction coefficients may be accurately calculated from the product of the collision rate and an average momentum transfer, the latter being independent of aggregate morphology. Langevin-dynamics simulations show that the diffusive motion of straight-chain aggregates may be described either by a monomer-dependent or an aggregate-average random force, if the shielding factors are appropriately chosen. (C) 2011 Elsevier Inc. All rights reserved.

Publication metadata

Author(s): Isella L, Drossinos Y

Publication type: Article

Publication status: Published

Journal: Journal of Colloid and Interface Science

Year: 2011

Volume: 356

Issue: 2

Pages: 505-512

Print publication date: 27/01/2011

ISSN (print): 0021-9797

ISSN (electronic): 1095-7103

Publisher: Academic Press

URL: http://dx.doi.org/10.1016/j.jcis.2011.01.072

DOI: 10.1016/j.jcis.2011.01.072

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