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Non-monotonous crossover between capillary condensation and interface localisation/delocalisation transition in binary polymer blends | | M. Mueller
; K. Binder
; E.V. Albano
; | | Date: |
2 May 2000 | | Subject: | Statistical Mechanics; Soft Condensed Matter | cond-mat.stat-mech cond-mat.soft | | Affiliation: | Joh. Gutenberg Universitaet, Mainz, Germany | | Abstract: | Within self-consistent field theory we study the phase behaviour of a symmetric binary AB polymer blend confined into a thin film. The film surfaces interact with the monomers via short range potentials. One surface attracts the A component and the corresponding semi-infinite system exhibits a first order wetting transition. The surface interaction of the opposite surface is varied as to study the crossover from capillary condensation for symmetric surface fields to the interface localisation/delocalisation transition for antisymmetric surface fields. In the former case the phase diagram has a single critical point close to the bulk critical point. In the latter case the phase diagram exhibits two critical points which correspond to the prewetting critical points of the semi-infinite system. The crossover between these qualitatively different limiting behaviours occurs gradually, however, the critical temperature and the critical composition exhibit a non-monotonic dependence on the surface field. | | Source: | arXiv, cond-mat/0005059 | | Services: | Forum | Review | PDF | Favorites | |
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