带电胶体棒诱导的耗散势

Depletion potentials induced by charged colloidal rods.

作者信息

Helden Laurent, Koenderink Gijsje H, Leiderer Paul, Bechinger Clemens

机构信息

2. Physikalisches Institut, Pfaffenwaldring 57, University of Stuttgart, D-70550 Stuttgart, Germany.

出版信息

Langmuir. 2004 Jul 6;20(14):5662-5. doi: 10.1021/la049571l.

DOI:10.1021/la049571l

PMID:16459575

Abstract

We present direct depletion potential measurements for a single colloidal sphere close to a wall in suspensions of charged colloidal rods. In contrast to earlier studies of purely entropic systems (Helden et al. Phys. Rev. Lett. 2003, 90, 048301), here electrostatic interactions are important. These enhance the depletion attraction and lead to repulsive parts in the interaction potentials, indicating correlation effects between the rods.

摘要

我们展示了在带电胶体棒悬浮液中单个胶体球靠近壁时的直接耗尽势测量结果。与早期对纯熵系统的研究（Helden等人，《物理评论快报》，2003年，90卷，048301）不同，这里静电相互作用很重要。这些相互作用增强了耗尽吸引力，并导致相互作用势中出现排斥部分，表明棒之间存在相关效应。