Forces measured between latex spheres in aqueous electrolyte: Non-DLVO behavior and sensitivity to dissolved gas
Forces measured between latex spheres in aqueous electrolyte: Non-DLVO behavior and sensitivity to dissolved gas
复制标题
DOI：
10.1021/la980900h
复制
发表时间：
1999-03-02
期刊：
影响因子：
3.9
通讯作者：
Horn, RG
中科院分区：
文献类型：
--
作者：
Considine, RF;Hayes, RA;Horn, RG
用原子力显微镜测量了水介质中两聚苯乙烯乳胶球之间的作用力。结果表明，在大的分离，这是超越了吸引力的“钩”，拉两个球体接触从一个相当大的范围（20-400 nm），远远大于可以预期的货车范德华吸引力的静电斥力。这种吸引力的作用范围因实验而异，与电解质浓度无关。然而，当水中溶解气体的水平降低时，发现范围显著降低。
An atomic force microscope was used to measure the forces acting between two polystyrene latex spheres in aqueous media. The results show an electrostatic repulsion at large separations which is overtaken by an attractive "hook" that pulls the two spheres into contact from a considerable range (20-400 nm), much larger than could be expected for a van der Waals attraction. The range of operation of this attraction varies from one experiment to another and is not correlated with electrolyte concentration. However, the range is found to decrease significantly when the level of dissolved gas in the water is reduced.