Journal
ADVANCES IN COLLOID AND INTERFACE SCIENCE
Volume 114, Issue -, Pages 53-60Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cis.2004.09.009
Keywords
oil sands structure; thin liquid films; wetting films; asymmetric liquid films; stability of bitumen/water/silica films
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The existence of a thin aqueous film, separating bitumen (a form of heavy oil) from inorganic solids in Athabasca Oil Sands, is analysed based on first principles. There is a general consensus in the literature on the hydrophilic character of the solids in oil sands. However, a review of the references cited in support of the solids being encapsulated in thin water envelopes produced a surprising lack of evidence. A theoretical analysis indicates that a water film separating clean, hydrophilic quartz and bitumen is stable under most conditions, and unstable for acidic oil sand ores. The existence of water-wet solids in the Athabasca Oil Sands remains a reasonable yet unproven postulate. It could therefore be dangerous to accept the water-wet solids postulate and then use it to interpret other phenomena. (c) 2005 Elsevier B.V. All rights reserved.
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