A Unified Approach to Disjoining Pressure in Interlayers around Lyophilic and Lyophobic Particles

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Abstract

Using the unified approach within the classical density functional theory, we have calculated the equilibrium local density profiles, the components of the pressure tensor, and the thicknesses of thin flat and spherical interlayers between a lyophilic or lyophobic solid surface and a gas or liquid phase, respectively.

These interlayers are not isotropic, and there is a disjoining pressure in them. Dependences of this pressure on the interlayer thickness have been found. In the presence of a capillary pressure inside the interlayers, the disjoining pressure counteracts it and leads to the appearance of stable long-living droplets around lyophilic solid particles and stable long-living bubbles around lyophobic particles. It has been shown that the mechanical and thermodynamic definitions of the disjoining pressure in a spherical interlayer agree with each other. In contrast to case of liquid films on lyophilic particles, the disjoining pressure in stable spherical vapor layers around a nanosized lyophobic solid particle is found to be greater than in flat vapor layers near a planar lyophobic substrate. Increasing lyophobicity provides that the disjoining pressure isotherms change from non-monotonic to monotonic functions of the vapor layer thickness.
Original languageEnglish
Title of host publication35th Conference of European Colloid & Interface Society
Subtitle of host publicationBook of abstracts Poster presentations
Pages342
Number of pages1
StatePublished - 5 Sep 2021
Event35th Conference of the European Colloid & Interface Society (ECIS 2021)
- Crowne Plaza Hotel, Афины, Greece
Duration: 5 Sep 202110 Sep 2021
Conference number: 35
https://www.ecis2021.org/
https://www.ecis2021.org/program

Conference

Conference35th Conference of the European Colloid & Interface Society (ECIS 2021)
Abbreviated titleECIS 2021
Country/TerritoryGreece
CityАфины
Period5/09/2110/09/21
Internet address

Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry
  • Surfaces and Interfaces
  • Statistical and Nonlinear Physics

Keywords

  • interlayer
  • lyophobic
  • lyophilic
  • disjoining pressure
  • density functional approach
  • wetting

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