Analysis of the gas states at a liquid/solid interface based on interactions at the microscopic level

Zhaoxia Li, Xuehua Zhang, Lijuan Zhang, Xiaocheng Zeng, Jun Hu, Haiping Fang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The states of gas accumulated at the liquid/solid interface are analyzed on the basis of the continuum theory, in which the Hamaker constant is used to describe the long-range interaction at the microscopic scale. The Hamaker constant is always negative, whereas the "gas" spreading coefficient can be either negative or positive. Despite the complexity of gas, including that the density profile may not be uniform due to absorption on both solid and liquid surfaces, we predict three possible gas states at the liquid/solid interface, that is, complete "wetting", partial "wetting", and pseudopartial "wetting". These possible gas states correspond, respectively, to a gas pancake (or film) surrounded by a wet solid, a gas bubble with a finite contact angle, and a gas bubble(s) coexisting with a gas pancake. The typical thickness of the gas pancakes is at the nano scale within the force range of the long-range interaction, whereas the radius of the gas bubbles can be large. The state of a gas bubble(s) coexisting with a gas film is predicted theoretically for the first time. Our theoretical results can contribute to the development of a unified picture of gas nucleation at the liquid/solid interface.

Original languageEnglish (US)
Pages (from-to)9325-9329
Number of pages5
JournalJournal of Physical Chemistry B
Volume111
Issue number31
DOIs
StatePublished - Aug 9 2007

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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