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    Colloidal Interactions between Asphaltene Surfaces in Aqueous Solutions

    Year: 2006

    Journal: Langmuir, 2006, 22 (4), pp 1485–1492, 20111221

    Authors: Jianjun Liu, Liyan Zhang, Zhenghe Xu, and Jacob Masliyah

    Organizations: Global Mining and Metals, Nalco Company, Naperville, Illinois 60563, and Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6

    Asphaltene at oil/water interfaces plays a dominant role in the recovery of crude oil. In this study, asphaltene monolayer films were deposited on hydrophobic silicon wafers and silica spheres from oil−water interfaces using a Langmuir interfacial trough. The morphology of the deposited asphaltene films was characterized with an atomic force microscope (AFM). The colloidal forces between the prepared asphaltene films in aqueous solutions were measured with AFM to shed light on the stabilization of water or oil droplets coated with asphaltene films. Factors such as solution pH, KCl concentration, calcium addition, and temperature all showed a strong impact on colloidal forces between the prepared asphaltene films. The findings provided a better understanding of asphaltene interfacial films at an oil/water interface in stabilizing bitumen-in-water and water-in-bitumen emulsions.