Creep and drainage in the fast destabilization of emulsions

The destabilization of emulsions is important for many applications but remains incompletely understood. We perform squeeze flow measurements on oil-in-water emulsions, finding that the spontaneous destabilization of emulsions is generally very slow under normal conditions, with a characteristic tim...

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Bibliographic Details
Published in:Physics of fluids (1994) 2021-03, Vol.33 (3)
Main Authors: Dekker, Riande I., Deblais, Antoine, Veltkamp, Bastiaan, Veenstra, Peter, Kegel, Willem K., Bonn, Daniel
Format: Article
Language:English
Subjects:
Coalescing
Destabilization
Drainage
Emulsions
Fluid dynamics
Physics
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Summary:The destabilization of emulsions is important for many applications but remains incompletely understood. We perform squeeze flow measurements on oil-in-water emulsions, finding that the spontaneous destabilization of emulsions is generally very slow under normal conditions, with a characteristic time scale given by the drainage of the continuous phase and the coalescence of the dispersed phase. We show that if the emulsion is compressed between two plates, the destabilization can be sped up significantly; on the one hand, the drainage is faster due to the application of the squeezing force. On the other hand, creep processes lead to rearrangements that also contribute to the destabilization.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0039097