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Formation of water-in-oil (W/O) nano-emulsions in a water/mixed non-ionic surfactant/oil systems prepared by a low-energy emulsification method

AutorUsón, N.; Garcia, María José; Solans, Conxita
Palabras claveNano-emulsions
Non-ionic surfactant
Emulsification method
W/O emulsion
Phase behavior
Fecha de publicación1-oct-2004
CitaciónColloids and Surfaces a Physicochemical and Engineering Aspects 250 (1-3): 415-421 (2004)
ResumenW/O nano-emulsion formation by a low-energy emulsification method is described for the first time. The nano-emulsions have been formed in water/mixed Cremophor EL:Cremophor WO7 surfactant/isopropyl myristate systems at Cremophor EL:Cremophor WO7 ratios between 1:2 and 1:9, by slow addition of isopropyl myristate to surfactant/water mixtures. Phase behaviour studies have showed that the compositions giving rise to W/O nano-emulsions belong to multiphase regions, one of the phases being a lamellar liquid crystalline phase. The droplet size of the nano-emulsions at a fixed oil concentration of 85% and mixed surfactants/water ratio of 70/30 ranged from 60 to 160 nm as Cremophor EL:Cremophor WO7 ratio increased from 1:8 to 1:2. These nano-emulsions showed high kinetic stability. No phase separation was observed during 5 months in nano-emulsions of the water/Cremophor EL:Cremophor WO7 1:8/isopropyl myristate system with 85% oil concentration, although droplet size experienced an increase with time.
Descripción7 pages, 7 figures.-- Printed version published Dec 1, 2004.-- Issue title: "In honour of the 250th volume of Colloid and Surfaces A and the 25th Anniversary of the International Association of Colloid and Interface Scientists (IACIS)".
Versión del editorhttp://dx.doi.org/10.1016/j.colsurfa.2004.03.039
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