期刊
LANGMUIR
卷 37, 期 29, 页码 8726-8737出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c00975
关键词
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资金
- French CIFRE fellowship [2018-0911]
- Total S.A
By conducting experiments, we determined the coalescence rates of water droplets within emulsions stabilized by Span 80 in the presence of Tween 20. Using a microscopic model based on a theory of hole nucleation, we established an analytical formula that quantitatively predicts the coalescence frequency. Despite its simplicity and assumptions, this formula accurately captures experimental results in a wide range of water-in-crude oil systems.
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 80-stabilized 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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