Phase behavior of reverse microemulsions based on Peceol^庐

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• 作者：Abdelkader Mouri ; Olivier Diat ; Abdeslam El Ghzaoui ; Caroline Bauer ; Jean Claude Maurel ; Jean-Marie Devoisselle ; Christophe Dor ; eu ; Philippe Legr
• 关键词：Phase diagram ; Phase transitions ; Microemulsion ; Polar lipids ; Rheology ; SAXS
• 刊名：Journal of Colloid and Interface Science
• 出版年：15 February, 2014
• 年：2014
• 卷：416
• 期：Complete
• 页码：139-146
• 全文大小：1522 K

文摘

The phase diagram of the four component system Peceol庐/lecithin/ethanol/water was studied at 25 掳C and at a fixed fraction of ethanol. It shows an isotropic W/O microemulsion phase, biphasic liquid system and Liquid crystalline phases. The stabilizing effect of lecithin with the fluidifying effect of ethanol on the microemulsion based on long chain glycerides provides an effective combination to solubilize a large amount of water. Some structural transitions in the phase diagram were investigated as a function of water content using conductivity, rheology, Karl Fisher titration, optical microscopy and SAXS measurements. The results show no change in the microstructure of the isotropic liquid upon phase separation in the liquid biphasic area. However, in the water rich region, migration of ethanol to the external aqueous phase at the expense of the saturated microemulsion promotes the formation of liquid crystalline phases. As a function of water content, the structural change to the liquid crystalline phases follows: isotropic phase L₂ 鈫?#xA0;Inverted hexagonal phase H₂ 鈫?#xA0;Inverted hexagonal H₂/lamellar L_伪 phases.