A Unified Approach to Disjoining Pressure in Liquid and Vapor Interlayer within the Framework of the Density Functional Theory

Abstract The classical density functional theory makes it possible to explicitly calculate the local profiles, components of pressure tensor, and thicknesses thin interlayers between a lyophilic or lyophobic solid surface and, accordingly, gas liquid phases at different values chemical potentials phases. Within framework unified approach based on gradient approximation theory, has been shown that, certain parameters characterizing wettability nonwettability solid, equilibrium films vapor layers uniform thickness are formed around spherical particle, if its is lyophobic, respectively. Mechanical thermodynamic definitions have given for disjoining in interlayer agreement proven by calculations particle radii. It that nanosized decreases with an increase radius, this phenomenon being opposite situation films.