The Relation Between Phase Behavior and Formation of Narrow Size Distribution W/O Emulsions |
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Authors: | Ana Forgiarini Jordi Esquena Carmen González Conxita Solans |
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Affiliation: | 1. Dept. Tecnologia de Tensioactius , Institut dinvestigacions Químiques, i Ambientals de Barcelona, CSIC , Jordi Girona 18–26, 08034, Barcelona, Spain;2. Dept. Enginyeria Química i Metallúrgica , Universitat de Barcelona , Martí i Franques 1, Barcelona, 08028, Spain |
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Abstract: | Water-in-oil (W/O) emulsions of the water/C12E5/isooctanol/isooctane system have been prepared at 25° C. Phase behavior studies of the system with constant (2.5 and 6 wt.%) isooctanol concentration showed that the surfactant becomes more lipophilic with the increase in the alkanol concentration. Emulsification was carried out using four low-energy emulsification methods using the slow addition of one or various components to the rest of them, with gentle agitation. Emulsions with low-polydis-persity were obtained when the emulsification process started with a single lamellar liquid crystalline phase. If in addition to a lamellar liquid crystalline phase, other phases, such as excess water phase, were initially present, emulsions with intermediate polydispersity were produced. When a lamellar liquid crystalline phase was not involved and the spontaneous natural curvature of the surfactant was not changed during emulsification, highly polydisperse emulsions were obtained. |
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