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Phase Inversion Temperature (PIT) Emulsification Process
Dept of Chemistry, Clarkson University, Potsdam, New York, USA.
YKI, Institute for Surface Chemistry, Stockholm, Sweden.
YKI, Institute for Surface Chemistry, Stockholm, Sweden.
2011 (English)In: Journal of Chemical and Engineering Data, ISSN 0021-9568, E-ISSN 1520-5134, Vol. 56, no 12, 4282-4290 p.Article in journal (Refereed) Published
Abstract [en]

A quant. anal. is made of the phase changes during the phase inversion temp. (PIT) emulsification process of an aq. hexadecane emulsion stabilized by a tetra-ethylene glycol dodecyl ether surfactant. The mech. dispersion part of the process takes place at the PIT, at which temp. the emulsion contains three phases: (1) water, with only minute fractions of surfactant and hydrocarbon; (2) an inverse micellar soln., with modest fractions of solubilized water; and (3) a bicontinuous microemulsion, with large concurrent solubilization of both water and hydrocarbon. After the mech. action at the PIT, the emulsion is immediately cooled to temps. beneath the PIT range, reducing the no. of phases in the emulsion to two, an oil/water (O/W) microemulsion with moderate surfactant and hydrocarbon content, and an inverse micellar hydrocarbon soln. with a significantly greater surfactant fraction. The emulsion is characterized by its large fraction of extremely small oil drops, significantly smaller than expected from the mech. process. These drops are commonly assumed to emanate from the hydrocarbon fraction of the original bicontinuous microemulsion, the small size of the oil drops being a rational consequence of the colloidal dispersion prior to the phase sepn. The quant. anal. of the phase fractions vs. temp. revealed this assumption to be premature. The original water phase is not the final aq. phase in the emulsion; this phase is instead formed from the microemulsion phase by absorbing the original water phase, gradually modifying its own structure to become water-continuous with the originally large hydrocarbon fraction reduced to modest levels. In the process, a part of the original microemulsion is sepd., forming the small oil drops. [on SciFinder(R)]

Place, publisher, year, edition, pages
2011. Vol. 56, no 12, 4282-4290 p.
Keyword [en]
phase inversion temp emulsification microemulsion emulsion
National Category
Other Chemistry Topics
URN: urn:nbn:se:kth:diva-78123DOI: 10.1021/je101179sISI: 000297608800003OAI: diva2:497470
CAPLUS AN 2011:1168159(Journal; Online Computer File). QC 20120215Available from: 2012-02-10 Created: 2012-02-07 Last updated: 2012-02-15Bibliographically approved

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Corkery, Robert W.
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