High Internal Phase Emulsions: Catastrophic Phase Inversion, Stability, and Triggered Destabilization

Autor:	Saeed Mashinchi, Timothy S. Dunstan, Paul D. I. Fletcher
Rok vydání:	2011
Předmět:	Hand shaking Chemistry Drop (liquid) Surfaces and Interfaces Condensed Matter Physics Internal phase Contact angle Crystallography Chemical engineering Pulmonary surfactant Volume fraction Emulsion Electrochemistry General Materials Science Wetting Spectroscopy
Zdroj:	Langmuir. 28:339-349
ISSN:	1520-5827 0743-7463
DOI:	10.1021/la204104m
Popis:	We have investigated the formation, drop sizes, and stability of emulsions prepared by hand shaking in a closed vessel in which the emulsion is in contact with a single type of surface during its formation. The emulsions undergo catastrophic phase inversion from oil-in-water (o/w) to water-in-oil (w/o) as the oil volume fraction is increased. We find that the oil volume fraction required for catastrophic inversion exhibits a linear correlation with the oil-water-solid surface contact angle. W/o high internal phase emulsions (HIPEs) prepared in this way contain water drops of diameters in the range 10-100 μm; emulsion drop size depends on the surfactant concentration and method of preparation. W/o HIPEs with large water drops show water separation but w/o HIPEs with small water drops are stable with respect to water separation for more than 100 days. The destabilization of the w/o HIPEs can be triggered by either evaporation of the oil continuous phase or by contact the emulsion with a solid surface of the "wrong" wettability.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9f12fe662df7be86fc696b8a59405aa https://doi.org/10.1021/la204104m Zobrazit plný text záznamu