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Article Dans Une Revue Langmuir Année : 2021

Effect of a Surfactant Mixture on Coalescence Occurring in Concentrated Emulsions: The Hole Nucleation Theory Revisited

Résumé

By conducting both a bottle test and isolate drop−drop experiments, we determine the coalescence rates of water droplets within water-in-oil emulsions stabilized by a large amount of Span 80 in the presence of Tween 20, a surfactant that acts as a demulsifier. Using a microscopic model based on a theory of hole nucleation, we establish an analytical formula that quantitatively predicts the coalescence frequency per unit area of droplets whose interfaces are fully covered by surfactant molecules. Despite its simplicity and the strong assumptions made for its derivation, this formula captures our experimental findings on Span 80stabilized emulsions as well as other results, found in the literature, remarkably well on a wide range of water-in-crude oil systems.
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hal-03292845 , version 1 (20-07-2021)

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Huy-Hong-Quan Dinh, Enric Santanach-Carreras, Marie Lalanne-Aulet, Véronique Schmitt, Pascal Panizza, et al.. Effect of a Surfactant Mixture on Coalescence Occurring in Concentrated Emulsions: The Hole Nucleation Theory Revisited. Langmuir, 2021, 37 (29), pp.8726-8737. ⟨10.1021/acs.langmuir.1c00975⟩. ⟨hal-03292845⟩
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