Thermodiffusion of interacting colloids. I. A statistical thermodynamics approach

被引：76
作者：
Dhont, JKG [1 ]
机构：
[1] Forschungszentrum Julich, D-52425 Julich, Germany
来源：
JOURNAL OF CHEMICAL PHYSICS | 2004年 / 120卷 / 03期
关键词：
D O I：
10.1063/1.1633546
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The thermal diffusion coefficient of colloids consists of two additive contributions, one related to specific interactions between the surfaces of colloidal particles with solvent molecules, and a contribution due to interactions between the colloidal particles. In the present paper, the effect of intercolloidal particle interactions on their thermodiffusive behavior is discussed within a statistical thermodynamics framework. Transport coefficients are expressed in terms of the interaction potential between the colloidal spheres. A special feature of macromolecular systems is that this interaction potential is a potential of mean force, which is temperature dependent. It is shown that under certain conditions this implicit temperature dependence gives rise to negative Soret coefficients, that is, to diffusion of macromolecules to hot regions. (C) 2004 American Institute of Physics.
引用
收藏
页码：1632 / 1641
页数：10
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