Volume 39, Number 6, September 1997
|Page(s)||633 - 638|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Effect of surface roughness on bulk-disorder–induced wetting
Dipartimento di Fisica and Sezione INFN, Università di Bologna,
I-40126 Bologna Italy
2 INFM-Dipartimento di Fisica and Sezione INFN, Università di Padova, I-35131 Padova, Italy
3 Dipartimento di Fisica and INFN (Gruppo Collegato di Udine) Università di Udine, I-33100 Udine, Italy
Accepted: 11 August 1997
Transfer-matrix results in show that wetting of a rough, self-affine wall induced by bulk bond disorder turns discontinuous as soon as the wall roughness exponent exceeds , the spatial anisotropy index of interface fluctuations in the bulk. For critical wetting is recovered, in the same universality class as for the flat-wall case. These and related findings suggest a free-energy structure such to imply first-order wetting also without disorder, or in , whenever exceeds the appropriate . The same thresholds should apply also with van der Waals forces, in cases when implies a strong-fluctuation regime.
PACS: 68.45.Gd – Wetting / 05.70.Fh – Phase transitions: general aspects / 82.65.Dp – Thermodynamics of surfaces and interfaces
© EDP Sciences, 1997
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