Surface Potential Dependence of the Hamaker Constant
Surface Potential Dependence of the Hamaker Constant
复制标题
Hamaker 常数的表面电势依赖性
DOI：
10.1021/jp808372r
复制
发表时间：
2009-03-19
影响因子：
3.7
通讯作者：
Zhu, Hualin
中科院分区：
文献类型：
--
作者：
Li, Hang;Peng, Xuhong;Zhu, Hualin
哈梅克常数是材料颗粒相互作用研究中的一个关键参数。尽管有不少测量哈梅克常数的方法，但目前的实验结果表明，对于同一种材料，不同方法所得到的哈梅克常数通常有相当大的差异。本文提出了一种测定哈梅克常数的新方法：通过测定材料在水溶液中的溶胀压力可以很容易地测量哈梅克常数。本文用该方法得到了36种具有不同表面电位的蒙脱石的哈梅克常数。结果表明，蒙脱石的哈梅克常数与表面电位有关。当表面电位大于 -267 mV时，哈梅克常数的值随表面电位的增加而增大；然而，当表面电位低于 -267 mV时，哈梅克常数似乎随表面电位的增加而减小。
Hamaker constant is a key parameter in the study of particle interactions of materials. Even though there are quite a few methods for measuring the Hamaker constant, the current experimental results showed that the obtained Hamaker constants from different methods for the same material usually had considerable variations. In this paper, a new method for determination of the Hamaker constant was suggested: the Hamaker constant can be easily measured through determination of the swelling pressure of the material in aqueous solution. In this paper, the Hamaker constants of 36 different montmorillonites with different surface potentials were obtained by the method. The results showed that the Hamaker constant of montmorillonite was surface potential dependent. At values of the surface potential larger than −267 mV, the values of the Hamaker constant increased with an increase of the surface potential; nevertheless, at surface potentials lower than −267 mV, the Hamaker constant appeared to decrease with an inc...