Hamaker functions for kaolinite and montmorillonite

被引：11
|
作者：
Weber, Ch [1 ]
Kaufhold, S. [1 ]
机构：
[1] Fed Inst Geosci & Nat Resources, Stilleweg 2, D-30655 Hannover, Germany
来源：
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS | 2021年 / 43卷
关键词：
Hamaker constant; Van der Waals force; Lifshitz theory; Clay minerals; Montmorillonite; Kaolinite; CONSTANTS; FORCES; PREDICTIONS; STABILITY; MINERALS; CLAYS;
D O I：
10.1016/j.colcom.2021.100442
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An oscillator representation for the calculation of van der Waals forces/energies is presented for kaolinite and montmorillonite. The non-retarded Hamaker constants across water (air) are 5.1 (59.2) zJ and 7.3 (75.4) zJ for montmorillonite and kaolinite, respectively. The combined effect of retardation and geometrical peculiarities of the monmorillonite system are discussed briefly. It is shown that the van der Waals free energy between two montmorillonite layers of finite thickness, immersed in water, changes from attractive to repulsive at a separation distance primarily determined by their thickness.
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页数：4
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