Pair interaction of charged colloidal spheres near a charged wall
Pair interaction of charged colloidal spheres near a charged wall
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DOI：
10.1103/physreve.64.050401
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发表时间：
2001-11-01
影响因子：
2.4
通讯作者：
Grier, DG
中科院分区：
文献类型：
--
作者：
Behrens, SH;Grier, DG
尽管分散在干净水中的等电荷胶体粒子预计会相互排斥，但一直有报道称，由带电宏观表面限制的带电胶体球存在一种无法解释的长期吸引力。我们提出了一种在单个带电球壁附近的带电球体对相互作用能的另一种平衡测量。分析它们在不同浓度下的径向分布函数，揭示了一种纯粹的球-球相互作用，这种相互作用可以用屏蔽的库仑势很好地描述。
Although equally charged colloidal particles dispersed in clean water are expected to repel each other, an unexplained long-range attraction has consistently been reported for charged colloidal spheres confined by charged macroscopic surfaces. We present an alternative equilibrium measurement of the pair interaction energy for charged spheres near a single charged wall. Analyzing their radial distribution functions for different concentrations reveals a purely repulsive sphere-sphere interaction that is well described by a screened Coulomb potential.