Phase behavior of oleyl oleate with nonionic surfactants

• Main Authors: Sulaiman, Azmahani, Basri, Mahiran, Salleh, Abu Bakar, Raja Abdul Rahman, Raja Noor Zaliha, Ahmad, Salmiah
• Format: Article
• Language: English
• Published: Taylor & Francis 2005
• Online Access: http://psasir.upm.edu.my/id/eprint/7104/1/Phase%20behavior%20of%20oleyl%20oleate%20with%20nonionic%20surfactants.pdf; http://psasir.upm.edu.my/id/eprint/7104/; http://www.tandfonline.com/doi/abs/10.1081/DIS-200062937

Oleyl oleate (OE), a liquid wax ester, has been reported as a potential raw material for cosmetic and pharmaceutical uses but little is known about its phase behavior in ternary systems. Two types of nonionic surfactants were selected, namely, Tween-60 (T60) and Span 20 (S20). Phase diagrams of OE/T60/water and OE/S20/water systems were constructed at 25.0±0.5°C. Ternary phase diagrams of OE/T60:S20 (20:80 and 60:40)/water systems were then constructed at the same temperature. The ratios of 80:20 and 60:40 of T60:S20 were selected due to different solubility points of the surfactants in water. The results showed that the oleyl oleate with mixed surfactants system, OE/T60:S20 (20:80 and 60:40)/water, gave better performance than the individual surfactant systems. The high percent of T60 of 80:20 in the T60:S20 system contributes to enlargement of the isotropic region. In contrast, by increasing the percent of S20 of 60:40 in T60:S20 contributes to a larger liquid crystalline region.