On the friction coefficient of straight-chain aggregates

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:356

Article

Isella, Lorenzo¹  Drossinos, Yannis^1,2 

[1] Commiss European Communities, Joint Res Ctr, I-21027 Ispra, VA, Italy

[2] Newcastle Univ, Sch Mech & Syst Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

关键词: Straight-chain aggregates;    Friction coefficient;    Diffusion coefficient;    Collision rate;    Langevin simulations;   

DOI  :  10.1016/j.jcis.2011.01.072

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free