Lattice model of defect-plane wetting

C. Ebner, F. Hayot, J. Cai

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We present a study of defect-plane wetting using an Ising lattice-gas model with nearest-neighbor interactions and mean-field theory. In addition to solving the mean-field equations for the lattice model, we present an analysis of the model in the continuum limit that is valid at temperatures close to the bulk critical temperature. The continuum limit of the model is equivalent to the Landau theory for wetting of a defect plane studied by Sevrin and Indekeu, except that we include a surface field that acts only on the layers adjacent to the defect plane and that represents a potential produced by the defect. This field, which is likely to be present in a real system, significantly alters the wetting phenomena relative to the case of no surface field, giving rise to critical wetting transitions and multicritical points. The phase diagrams resemble in some respects those found in analyses of wetting on an inert substrate and also contain new phenomena as a consequence of the possibility of forming wetting phases on both sides of the defect plane.

Original languageEnglish
Pages (from-to)8187-8195
Number of pages9
JournalPhysical Review B
Volume42
Issue number13
DOIs
StatePublished - 1990
Externally publishedYes

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