Effect of Interfacial Rheology on Drop Coalescence In Water-Oil Emulsion - ENCIT 2020 скачать в хорошем качестве

Effect of Interfacial Rheology on Drop Coalescence In Water-Oil Emulsion - ENCIT 2020

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 four 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 on the oil-water interfaces to no coalescence of the drops. When the coalescence process occurs the drainage time seems not to be related with the aging time neither with the surfactant concentrations. The interfacial tension showed similar behaviors for all concentrations, whereas that the elastic and viscous modulii presented significant changes with surfactant concentration and also with interface aging. Authors: Tálita Coffler Botti Erick F. Quintella Márcio da Silveira Carvalho #encit2020 #pucrio #lmmp