On the interfacial properties of micrometre–sized water droplets in crude oil

Abstract

Restricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Yeung A., Dabros T., Czarnecki J. and Masliyah J. 1999On the interfacial properties of micrometre–sized water droplets in crude oilProc. R. Soc. Lond. A.4553709–3723http://doi.org/10.1098/rspa.1999.0473SectionRestricted accessOn the interfacial properties of micrometre–sized water droplets in crude oil A. Yeung A. Yeung Syncrude Canada Limited, Edmonton Research Centre, 9421-17 Avenue, Edmonton, Alberta, Canada T6N 1H4 Google Scholar Find this author on PubMed Search for more papers by this author , T. Dabros T. Dabros Natural Resources Canada, CANMET, 1 Oil Patch Drive, Suite A202, Devon, Alberta, Canada T9G 1A8 Google Scholar Find this author on PubMed Search for more papers by this author , J. Czarnecki J. Czarnecki Syncrude Canada Limited, Edmonton Research Centre, 9421-17 Avenue, Edmonton, Alberta, Canada T6N 1H4 Google Scholar Find this author on PubMed Search for more papers by this author and J. Masliyah J. Masliyah Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6 Google Scholar Find this author on PubMed Search for more papers by this author A. Yeung A. Yeung Syncrude Canada Limited, Edmonton Research Centre, 9421-17 Avenue, Edmonton, Alberta, Canada T6N 1H4 Google Scholar Find this author on PubMed Search for more papers by this author , T. Dabros T. Dabros Natural Resources Canada, CANMET, 1 Oil Patch Drive, Suite A202, Devon, Alberta, Canada T9G 1A8 Google Scholar Find this author on PubMed Search for more papers by this author , J. Czarnecki J. Czarnecki Syncrude Canada Limited, Edmonton Research Centre, 9421-17 Avenue, Edmonton, Alberta, Canada T6N 1H4 Google Scholar Find this author on PubMed Search for more papers by this author and J. Masliyah J. Masliyah Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6 Google Scholar Find this author on PubMed Search for more papers by this author Published:08 October 1999https://doi.org/10.1098/rspa.1999.0473AbstractThe remarkable stability of water–in–crude oil emulsions is due to the presence of a complex adsorbed layer at the surfaces of the dispersed droplets. Except for its role as a steric barrier, little is known about the in situ properties of this interfacial structure. In this study, new insights into the adsorbed layer are provided by direct micrometre–scale measurements. At low crude content in the bulk where, according to interfacial tension isotherms, there should be little or no surfactants on the droplet surface, the adsorbed layer displays pronounced rigidity and is capable of preventing coalescence and coagulation of the droplets. Such interfaces are highly dissipative and can be well described by the Boussinesq–Scriven model. As the supply of surface active materials in the bulk (i.e. the crude content) increases, the adsorbed layer transforms from a rigid structure to a fluid interface. This fluid layer continues to inhibit coalescence, although signs of weak interdroplet adhesion begin to appear. Under area compression, the fluid interface will discharge micrometre–sized emulsion droplets into the oil phase via a ‘budding’ mechanism. 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