Interfacial turbulence and spontaneous emulsification in alkali—acidic oil systems

Rudin, Jeff; Wasan, Darsh T.

doi:10.1016/0009-2509(93)80239-m

Cited by 38 publications

(22 citation statements)

References 16 publications

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“…The effect of pH on the equilibrium interfacial tensions in systems formed by crude oil containing organic acids or acid bitumen/aqueous solutions of NaOH was discussed in previous papers (5,(33)(34)(35)(36). The proposed mechanism relies on the interfacial reaction between the carboxylic acids present in the oleic phase and the alkali in the aqueous phase.…”

Section: Resultsmentioning

confidence: 93%

Bitumen-in-Water Emulsions Stabilized with Natural Surfactants

Acevedo

Gutiérrez

Rivas

2001

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 93%

Bitumen-in-Water Emulsions Stabilized with Natural Surfactants

Acevedo

Gutiérrez

Rivas

2001

Journal of Colloid and Interface Science

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“…5 The fact that many hypotheses have been proposed over one hundred years for the mechanism of spontaneous emulsification attests that the mechanism is not fully explained yet. The models so far proposed include interfacial turbulence, 2,12 ultralow £, 46 diffusion and stranding, 3,7,17 and differences in osmotic pressure. 10 The oscillation phenomena are well-known at the liquid« liquid interface.…”

Section: A Historical Perspectivementioning

confidence: 99%

“…2641 The spontaneous emulsification and the oscillation phenomena often accompany the movement of the interface due to the Marangoni effect. 2,6,12,16,19,21,2632,41 The Marangoni instability in a liquidliquid two-phase system due to the transfer of a solute was first analyzed by Sternling and Scriven. 50 They determined the condition for the onset of the instability when a small perturbation was introduced into the system by the linear stability analysis.…”

Section: A Historical Perspectivementioning

confidence: 99%

“…In the spontaneous emulsification accompanied with the chemical reaction of ionic surfactants at the interface, 13,5,12 Á W O º is probably located in the instability window due to the partition and adsorption of the surface-active ion and the energy of the chemical reaction may drive the spontaneous emulsification.…”

Section: Spontaneous Emulsification As a Manifestation Of The Electromentioning

confidence: 99%

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Electrochemical Instability in Liquid–Liquid Two-Phase Systems

Kitazumi¹,

Kakiuchi²

2011

Bulletin of the Chemical Society of Japan

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On the basis of the dependency of adsorption and partitioning of ionic surfactant on the phase-boundary potential (Á W O º), it is possible to understand in a unified manner various instability phenomena at the liquid«liquid interface in the presence of ionic surfactants, such as spontaneous emulsification, oscillation of Á W O º and interfacial tension, and irregularly increased currents on voltammograms of the transfer of surface-active ions across the interface. These instabilities are associated with the electrochemical instability, which defines a thermodynamically unstable condition at the liquid«liquid interface in terms of Á W O º and is a fundamental concept to understand the instabilities in the presence of ionic surfactants. The characteristic manifestations of the electrochemical instability, that is, the irregularly increased current on voltammograms in the transfer of surface-active ions, the spontaneous emulsification, and the spontaneous oscillation of Á W O º can be designed based on the criterion of the electrochemical instability.

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“…For example, the phase behavior of oil/water/surfactant systems containing a fatty acid can be manipulated by changing the pH (29,30). Dynamic effects have been observed in such systems, e.g., spontaneous emulsification and time dependence of interfacial tension (31).…”

Section: Introductionmentioning

confidence: 99%