Abstract
The rate of thinning of the Phase 2 film separating a drop (Phase 1) from a Phase 1/ Phase 2 interface was found to increase with diffusion from, and decrease with diffusion into, the drop. The film thickness at rupture appeared to be unaffected. The results provide direct confirmation of the mechanism proposed by Groothius and Zuiderweg, based on the Marangoni effect whereby changes in the rate of film thinning arise from interfacial flow as a result of gradients in interfacial tension produced by unequal distribution of the diffusing component over the drop surface.
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