Wetting characteristics and kinetic behavior of amphoteric ionic surfactant on the microscopic “solid-liquid” interface of coal - A case study

Abstract

This study investigates the wetting characteristics and kinetic behavior of amphoteric ionic surfactant on the microscopic “solid-liquid” interface of coal based on low-field NMR experiment combined with molecular dynamics simulations, since the basic research on the wetting mechanism of coal seam water injection is not systematic and in-depth enough, which restricts the further development of dust control technology in mines. Firstly, the wetting characteristics of amphoteric surfactant (CAB-35) on coal with different degrees of metamorphism and the dynamic spreading of the wetting range were obtained by low-field NMR experiment, revealing the microscopic wetting law at the “solid-liquid” interface of coal; In order to establish the numerical simulation operation system of interfacial wetting of coal macromolecular structure characteristics based on coal surface chemical parameters and using molecular dynamics theory, the wetting dynamic behavior of amphoteric ionic surfactants on coal dust is studied from microscopic perspective, and the law of influence of surface chemical characteristics on coal wetting characteristics is obtained, so as to improve and enrich the theoretical system of coal wetting, in order to promote the development and enhancement of coal mine water injection and wetting and dust control technology and clean production, and realize the clean production of mines.