Phase Behavior and Evaporation Profile of Tween 20-Eugenol System. Effect of Different Alkane Chain Length and Solvent System

A. Kassim1, W.H. Lim2, D. Kuang1, W.W.M. Rusmawati3, A.H. Abdullah1 and S.P. Teoh1

1Chemisty Department, Faculty Science and Environmental Studies, Universiti Putra Malaysia, 43400 Seri Serdang Selangor, Malaysia

2Advanced Oleochemical Technology Centre (AOTC), Malaysia Palm Oil Board, 43650 Bandar Baru Bangi, Selangor, Malaysia

3Faculty of Science and Technology, Universiti Pendidikan Sultan Idris, 35900 Tanjung Malim, Perak, Malaysia


The isotropic region of Tween 20/eugenol/n-alkane in aqueous systems was determined. The solubilisation trend of isotropic solution formed in the presence of eugenol was studied as a function of different alkyl chain length of n-alkane. The solubility of solvent in surfactant solution is dependent on their molecular polarity. An increase in n-alkane chain length (lower polarity) lead to smaller isotropic region which will affect the surfactant partitioning between the interface, the oil phase and the aqueous phase of the microemulsion as the oil chain length is varied. The changes of evaporation behaviour were affected strongly by the types of phases existed in the systems. The increment of n-alkane and water content led to higher evaporation rate. But the formation of w/o microemulsion would lower the evaporation rate because water molecules were trapped in the core of aggregates. In solubilisation system, evaporation rate is dependent on the solvent content and the interaction between Tween 20 and solvent molecules in the mixed composition.