Possible approach to estimating the dispersion interaction in powder systems

Abstract

In this paper, we present the results of testing the algorithm for calculating the Hamaker constant proposed by the authors as characteristics of the dispersion interaction according to experimental data obtained by studying the composition of fine powders of basalt and polymineral sand. For this purpose, based on a number of assumptions, the concept of an analogue Hamaker constant is introduced, which is an experimentally determined quantity.This parameter is recommended to be used when choosing the quantitative ratio of powder raw materials as a criterion for assessing the maximum possible van der Waals effect of dispersion interaction. An assumption was made about the presence of a constant characteristic of a thin film wetting the analyzed surface. Moreover, this thin film has a contact angle of the transition region “film-bulk phase”, the value of which is determined by the nature of the surface and the properties of the wetting liquid. The contact angle of the transition region can be an additional quantitative criterion for the selection of materials that are compatible in nature.

Methods for Assessing Mechanically Activated Mineral Raw Materials for Composite Binders

“…15 -активности поверхности, определяемой как отношение величины свободной поверхностной энергии к удельной массовой энергии атомизации, и позволяющей сделать вывод о возможности использования диспергированного минерального сырья в качестве компонентов строительных материалов [35,38,46]; -t-критерия -показателя возможности использования минерального сырья как пуццоланового компонента в составе КВ. На основании его расчета оценивается однородность и симметричность распределения результатов определения прочности образцов.…”