TY - JOUR

T1 - Disjoining pressure in vapor layers near planar and spherical lyophobic surfaces

AU - Shchekin, Alexander K.

AU - Gosteva, Liubov A.

AU - Tatyanenko, Dmitry V.

N1 - Funding Information: This work was financially supported by Russian Foundation for Basic Research (grant No. 19-03-00997a ). Publisher Copyright: © 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/4/1

Y1 - 2021/4/1

N2 - A classical square-gradient density functional theory is used for describing disjoining pressure in vapor layers between a lyophobic planar smooth solid substrate and stable bulk liquid, and between a lyophobic nanosized solid sphere and stretched bulk liquid. Profiles of local density, of normal and tangential components of the local pressure tensor in the interlayers are calculated and analyzed for planar substrate and spherical particle at several values of the chemical potential of the fluid and parameters controlling wettability of solid. The pressure tensor is found to be significantly anisotropic in the vapor layers near the smooth solid surfaces. Mechanical and thermodynamic definitions of the disjoining pressure in the spherical vapor layer were compared and shown to be consistent. In contrast to case of liquid films, the disjoining pressure in vapor layers near the nanosized lyophobic solid particle is found to be greater than near the planar wall. It has been directly shown that, depending on lyophobicity, the disjoining pressure isotherms change from nonmonotonic to monotonic functions of the vapor layer thickness.

AB - A classical square-gradient density functional theory is used for describing disjoining pressure in vapor layers between a lyophobic planar smooth solid substrate and stable bulk liquid, and between a lyophobic nanosized solid sphere and stretched bulk liquid. Profiles of local density, of normal and tangential components of the local pressure tensor in the interlayers are calculated and analyzed for planar substrate and spherical particle at several values of the chemical potential of the fluid and parameters controlling wettability of solid. The pressure tensor is found to be significantly anisotropic in the vapor layers near the smooth solid surfaces. Mechanical and thermodynamic definitions of the disjoining pressure in the spherical vapor layer were compared and shown to be consistent. In contrast to case of liquid films, the disjoining pressure in vapor layers near the nanosized lyophobic solid particle is found to be greater than near the planar wall. It has been directly shown that, depending on lyophobicity, the disjoining pressure isotherms change from nonmonotonic to monotonic functions of the vapor layer thickness.

KW - пузырек

KW - паровая прослойка

KW - несмачивание

KW - лиофобность

KW - расклинивающее давление

KW - метод функционала плотности

KW - Bubble

KW - Vapor layer

KW - Non-wetting

KW - Lyophobicity

KW - Disjoining pressure

KW - Density functional theory

UR - http://www.scopus.com/inward/record.url?scp=85100827140&partnerID=8YFLogxK

U2 - 10.1016/j.colsurfa.2021.126277

DO - 10.1016/j.colsurfa.2021.126277

M3 - Article

AN - SCOPUS:85100827140

VL - 615

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

M1 - 126277

ER -