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Water–AOT–alkylbenzene microemulsions: Influence of alkyl chain length on structure and percolation behavior

Appel, M. ; Spehr, T. ; Wipf, R. ; Stühn, B. :
Water–AOT–alkylbenzene microemulsions: Influence of alkyl chain length on structure and percolation behavior.
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S0021979712...]
In: Journal of Colloid and Interface Science, 376 (1) pp. 140-145.
[Artikel], (2012)

Offizielle URL: http://www.sciencedirect.com/science/article/pii/S0021979712...

Kurzbeschreibung (Abstract)

We study the percolation behavior of the water-in-oil (w/o) droplet phase of AOT (sodium bis[2-ethylhexyl] sulfosuccinate)-based microemulsions with different alkylbenzenes (toluene, ethylbenzene, butylbenzene or octylbenzene) as oil phase. We use microemulsions of varying composition with molar water to surfactant ratios 0 ⩽ W ⩽ 50 and droplet (water plus surfactant) volume fractions 10% ⩽ ϕ ⩽ 50%. Using dielectric spectroscopy, a percolation transition is observed in w/o microemulsions with butylbenzene or octylbenzene. With increasing molecular weight of the alkylbenzene, the percolation temperature TP decreases. The structure of the microemulsions is determined by small angle X-ray scattering (SAXS). With increasing molar weight of the alkylbenzene, the stability range of the L2 droplet phase extends to higher W. The larger amount of solubilizable water can be related to variable oil penetration of the AOT monolayer, which affects the spontaneous curvature of the surfactant shell.

Typ des Eintrags: Artikel
Erschienen: 2012
Autor(en): Appel, M. ; Spehr, T. ; Wipf, R. ; Stühn, B.
Titel: Water–AOT–alkylbenzene microemulsions: Influence of alkyl chain length on structure and percolation behavior
Sprache: Englisch
Kurzbeschreibung (Abstract):

We study the percolation behavior of the water-in-oil (w/o) droplet phase of AOT (sodium bis[2-ethylhexyl] sulfosuccinate)-based microemulsions with different alkylbenzenes (toluene, ethylbenzene, butylbenzene or octylbenzene) as oil phase. We use microemulsions of varying composition with molar water to surfactant ratios 0 ⩽ W ⩽ 50 and droplet (water plus surfactant) volume fractions 10% ⩽ ϕ ⩽ 50%. Using dielectric spectroscopy, a percolation transition is observed in w/o microemulsions with butylbenzene or octylbenzene. With increasing molecular weight of the alkylbenzene, the percolation temperature TP decreases. The structure of the microemulsions is determined by small angle X-ray scattering (SAXS). With increasing molar weight of the alkylbenzene, the stability range of the L2 droplet phase extends to higher W. The larger amount of solubilizable water can be related to variable oil penetration of the AOT monolayer, which affects the spontaneous curvature of the surfactant shell.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Colloid and Interface Science
Band: 376
(Heft-)Nummer: 1
Verlag: ELSEVIER
Fachbereich(e)/-gebiet(e): Fachbereich Physik > Festkörperphysik, Condensed matter physics > Experimentelle Physik kondensierter Materie
Fachbereich Physik > Festkörperphysik, Condensed matter physics
Fachbereich Physik
Hinterlegungsdatum: 16 Apr 2012 07:12
Offizielle URL: http://www.sciencedirect.com/science/article/pii/S0021979712...
ID-Nummer: 10.1016/j.jcis.2012.02.062
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