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Describe what is the Gibbs-Marangoni effect and how it relates to the stabilization of a foam. A pure liquid has a surface tension of 73 mJ/m². A stable foam, produced by adding a surfactant, consists of spherical bubbles with 0.2 mm radii and film thicknesses of 30 nm. The Hamaker constant is 4.5 x 10-20 J. By how much was the liquid surface tension changed by adding the surfactant?
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Transcribed Image Text:Describe what is the Gibbs-Marangoni effect and how it relates to the stabilization of a foam. A pure liquid has a surface tension of 73 mJ/m². A stable foam, produced by adding a surfactant, consists of spherical bubbles with 0.2 mm radii and film thicknesses of 30 nm. The Hamaker constant is 4.5 x 10-20 J. By how much was the liquid surface tension changed by adding the surfactant?
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