000			01694nab a2200205 4500
005			20260520000816.0
008			260224s2009 xxu
245	0	0	_aHeavy oil-water interfacial properties and emulsion stability _bInfluence of dilution
260			_a _b _cene. 2009
270			_a15/05/2009 ; 15/04/2009
300			_a5 p. ; 294-299
520			_aTranscripción del resúmen publicado por el autor: We have performed a study of dynamic interfacial tension and rheology of interfaces between water and either crude oil diluted in toluene or in a model oil consisting of toluene, in which pentane-extracted asphaltenes were redissolved. We show that the break point of the curve interfacial tension versus asphaltene concentration is not related to an eventual critical aggregation concentration but rather to the collapse of the asphaltene surface layer. As for other amphiphilic species that adsorb irreversibly at an oil-water interface, the corresponding emulsion stability increases with the amphiphile concentration, even above the collapse point. The behavior of diluted crude oil and model oil are quite similar. However, the surface layers evolve over longer time scales in the case of diluted crude oil, probably because of the contribution of resins that form less polar aggregates with asphaltenes. This results in less stable emulsions, especially before the collapse point.
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aAlvarez, Gabriela _940899
100	1		_aPoteau, Sandrine _940900
100	1		_aArigillier, Jean-Francois _940901
999			_c169569 _d169569
856			_uhttp://pubs.acs.org/doi/full/10.1021/ef800545k