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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EFFECT OF INTERFACE RHEOLOGY ON DROP COALESCENCE IN WATER-OIL EMULSION
Submission Author:
Talita Botti , RJ
Co-Authors:
Talita Botti, Marcio CARVALHO, Erick Quintella
Presenter: Talita Botti
doi://10.26678/ABCM.ENCIT2020.CIT20-0556
Abstract
Over the last years several studies have been conducted to understand emulsions formation and its behavior. In some applications, the aim is the phase separation of the emulsions through the coalescence of the drops, as in the oil industry. In this study, the relationship between rheological properties of oil-water interfaces and the drainage time of a thin oil film between two aqueous drops was investigated. We evaluated three different concentrations of a nonionic surfactant (Span 80) dissolved in mineral oil (Primol 352) phase. In order to perform the interfacial rheological measurements it was used the pendant drop method in a Tracker-S tensiometer. The results indicate the relationship between the structure formed in the oil-water to the high drainage time. Shorter drainage time, and consequently drop coalescence, can be promoted by weakening the interface elastic modulus chemically or mechanically.
Keywords
emulsion stability, Interfacial rheology, Coalescence
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