Direct measurement of entropic forces induced by rigid rods

被引：79

作者：

Helden, L ^{[1
]}

Roth, R

Koenderink, GH

Leiderer, P

Bechinger, C

机构：

[1] Univ Konstanz, Dept Phys, D-78457 Constance, Germany

[2] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[3] Univ Stuttgart, ITAP, D-70569 Stuttgart, Germany

[4] Univ Utrecht, Vant Hoff Lab Phys & Colloid Chem, NL-3584 CH Utrecht, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.90.048301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first direct depletion potential measurements for a single colloidal sphere close to a wall in a suspension of rigid colloidal rods. Since all particle interactions are as good as hard-core-like, the depletion potentials are of entirely entropic origin. We developed a density functional theory approach that accurately accounts for this experimental situation. The depletion potentials calculated for different rod number densities are in very good quantitative agreement with the experimental results.

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页数：4

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