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What Controls the Thickness of Wetting Layers near Bulk Criticality?

Abstract : We study the thickness of wetting layers in the binary-liquid mixture cyclohexane methanol. Far from the bulk critical point, the wetting layer thickness is independent of temperature, resulting from the competition between van der Waals and gravitational forces. Upon approaching the bulk critical temperature [t=(Tc-T)/Tc-->0], we observe that the wetting layer thickness diverges as t-β ^ with effective critical exponent β ^=0.23+/-0.06. This is characteristic of a broad, intermediate scaling regime for the crossover from van der Waals wetting to critical scaling. We predict β ^=β/3~0.11, with β the usual bulk-order parameter critical exponent, showing a small but significant difference with experiment.
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Contributor : Salima Rafaï <>
Submitted on : Tuesday, March 19, 2013 - 1:27:34 PM
Last modification on : Tuesday, September 22, 2020 - 3:59:29 AM

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Denis Fenistein, Daniel Bonn, Salima Rafaï, Gerard H. Wegdam, Jacques Meunier, et al.. What Controls the Thickness of Wetting Layers near Bulk Criticality?. Physical Review Letters, American Physical Society, 2002, 89, pp.96101. ⟨10.1103/PHYSREVLETT.89.096101⟩. ⟨hal-00802230⟩



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