Determination of the surface energy of kaolinite and serpentine using PACHA formalism—Comparison with immersion experiments

Clays play an important role in a wide variety of industrial processes. Indeed, they present interesting surface properties. For these reasons, we study the surface energy of models of clays by solid state calculations using electronegativities equalization. In this article, we focus on kaolinite and serpentine, two clays characterized by a simple structure of the TO type. We describe the clays and their structures and we develop a simple model from solid state calculations used to determine the surface energy. The results are in agreement with a recent interpretation of the immersion of kaolinite in water. This article must be related to some others focusing on solid surface energy, especially some treating talc and chlorites, and montmorillonites saturated by alkaline cations, to be published.

In this paper, we focus our studies about the surface energy of clays on kaolinite and serpentine. Heats of immersion and calculations of solid surface tension are linked in view of comparison of results. Data and calculations are in correct agreement for kaolinite and allow the prediction of heat of immersion for serpentine to be made.Figure optionsDownload as PowerPoint slide