Structure and thermodynamics of colloid-polymer mixtures: A macromolecular approach

被引:129
作者
Fuchs, M [1 ]
Schweizer, KS
机构
[1] Tech Univ Munich, Dept Phys, D-85747 Garching, Germany
[2] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA
[3] Univ Illinois, Dept Chem, Urbana, IL 61801 USA
来源
EUROPHYSICS LETTERS | 2000年 / 51卷 / 06期
关键词
D O I
10.1209/epl/i2000-00383-8
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The change of the structure of concentrated colloidal suspensions upon addition of non-adsorbing polymer is studied within a two-component, Ornstein-Zernicke-based liquid state approach. The polymers' conformational degrees of freedom are considered and excluded volume is enforced at the segment level. The polymer correlation hole, depletion layer, and excess chemical potentials are described in agreement with polymer physics theory in contrast to models treating the macromolecules as effective spheres. Known depletion attraction effects are recovered for low particle density, while at higher densities novel many-body effects emerge which become dominant for large polymers.
引用
收藏
页码:621 / 627
页数:7
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