Authors Slavchov, R. ; Radoev, B. ; Stöckelhuber, K.W.
Title Equilibrium Profile and Rupture of Wetting Film on Heterogeneous Substrates
Date 25.11.2005
Number 12630
Abstract There is abundant experimental evidence, indicating that the non-homogeneity of solid substrates plays substantial role in the behavior of wetting films. Drainage and rupture of wetting films are among the most comprehensively studied phenomena that are influenced by the characteristics of the solid substrate state. Experimental data on silica/water/air wetting films reported in previous studies show that film lifetime is strongly dependent on the substrate degree of hydrophobicity, while the rate of drainage was observed to remain practically unaffected. It has been found also, that both van der Waals and electrostatic forces in these wetting films are repulsive and according to the classical DLVO theory, such films should remain stable.<br />The proposed explanation of the paradox (finite lifetimes in the presence of repulsive surface forces)—that the rupture of these films is caused by nanosized bubbles adhering to the hydrophobic silica surface, is a typical demonstration of the crucial effect of the surface non-homogeneities. The aim of this paper is to analyze the previously proposed model of wetting film with adhered to the solid substrate nanobubble and use the solution to discuss the consistency of the nanobubble rupture mechanism.
Publisher Colloids and Surfaces A: Physicochemical and Engineering Aspects
Citation Colloids and Surfaces A: Physicochemical and Engineering Aspects 261 (2005) 135-140

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