Transfer-matrix results in 2D show that wetting of a rough, self-affine wall induced by bulk bond disorder turns discontinuous as soon as the wall roughness exponent zeta w exceeds zeta(0) = 2/3, the spatial anisotropy index of interface fluctuations in the bulk. For zeta(W) < 2/3 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 3D, whenever zeta(W) exceeds the appropriate zeta(0). The same thresholds should apply also with van der Waals forces, in cases when Co implies a strong-fluctuation regime.
Effect of surface roughness on bulk disorder induced wetting
STELLA, ATTILIO;
1997
Abstract
Transfer-matrix results in 2D show that wetting of a rough, self-affine wall induced by bulk bond disorder turns discontinuous as soon as the wall roughness exponent zeta w exceeds zeta(0) = 2/3, the spatial anisotropy index of interface fluctuations in the bulk. For zeta(W) < 2/3 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 3D, whenever zeta(W) exceeds the appropriate zeta(0). The same thresholds should apply also with van der Waals forces, in cases when Co implies a strong-fluctuation regime.
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