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Langmuir 1992,8, 2547-2551 2547 Thermal Fluctuations of Thin Wetting Films on Disordered

Summary: Langmuir 1992,8, 2547-2551 2547
Thermal Fluctuations of Thin Wetting Films on Disordered
James L. Harden**+
Materials Department, School of Engineering, University of California,
Santa Barbara, California 93106
David Andelman
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences,
Tel-Aviv University,Ramat-Aviv 69978, Tel-Aviv, Israel
Received April 20, 1992. In Final Form: July 2, 1992
We consider thin liquid layers which completely wet nonideal (either rough or heterogeneous in
composition)solidsurfaces. Twodifferentsourcesof fluctuations of the liquidsurface are identified,and
the competition between them is investigated. For thick enough films (but still in the submicrometer
range),theliquidsurfacefluctuationsaredominatedbythermallyinducedcapillarywaves. Forthin films,
capillarywaves are strongly damped and the liquid surface fluctuations are correlated with the disorder
of theunderlyingsolidsurface. ThefluctuationspectrumisexplicitlycalculatedforavanderWaalsliquid
and for severaldifferent types of soliddisorder. Our findingsare in agreementwith recentX-rayspecular
reflection and diffuse scattering experiments.
1. Introduction
Wetting of solid surfaces has been an extremely active


Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University


Collections: Materials Science; Physics