Title: On the Friction Coefficient of Straight-chain Aggregates
Authors: ISELLA LorenzoDROSSINOS Ioannis
Citation: JOURNAL OF COLLOID AND INTERFACE SCIENCE vol. 356 no. 2 p. 505-512
Publication Year: 2011
JRC N°: JRC63384
ISSN: 0021-9797
URI: http://www.elsevier.com/locate/jcis
DOI: 10.1016/j.jcis.2011.01.072
Type: Articles in periodicals and books
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.
JRC Directorate:Energy, Transport and Climate

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