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    Soft-Glassy Rheology of Asphaltenes at Liquid Interfaces

    Year: 2015

    Journal: JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY, Vol. 36, p 1444-1451, 20170208

    Authors: Samaniuk, Joseph R.; Hermans, Eline; Verwijlen, Tom; Pauchard, Vincent; Vermant, Jan

    Organizations: ETH, Mat Sci, CH-8093 Zurich, Switzerland; Katholieke Univ Leuven, Chem Engn, Heverlee, Belgium; SINTEF Mat & Chem, Proc Technol Dept, Trondheim, Norway; Flow Assurance Ctr Excellence, Kjeller, Norway; CUNY, Dept Chem Engn, New York, NY 10021 USA

    The presence of asphaltenes in oil and water emulsions promotes emulsion stability, a major concern in the recovery of oil reserves. A number of mechanisms for this stabilizing effect have been proposed recently, including those that implicate the interfacial rheology of asphaltenes as a primary factor. We present interfacial shear rheological data for asphaltenes at liquid-liquid interfaces and show conclusively that asphaltenes at an oil-water interface exhibit a soft-glassy rheological behavior in agreement with the soft-glassy rheology (SGR) model. This characteristic allows the stabilization of emulsions via mechanical resistance to coalescence.