Journal of Atomic, Molecular, and Optical Physics
Volume 2012 (2012), Article ID 839074, 6 pages
Phase Behavior of Pseudo-Ternary Gemini Surfactant + 1-Hexanol/Oil/Water Systems
1School of Environmental Sciences, University of East Anglia, Norfolk, Norwich NR4 7TJ, UK
2Department of Chemical Sciences, University Malaysia Terengganu, Terengganu 21030 Kuala, Terengganu, Malaysia
Received 3 July 2012; Accepted 7 October 2012
Academic Editor: Ali Hussain Reshak
Copyright © 2012 Mohd Zul Helmi Rozaini. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Temperature dependent phase behavior of pseudo-ternary Gemini surfactant + 1-hexanol (1 : 5 molar ratios)/oil/water systems is reported from 0°C to 65°C. The influence of nature of hydrocarbon oil and type of electrolytes (weak as well as strong) has been investigated on the temperature induced phase behavior of the ternary system. At surfactant concentration, %, a “nose-shaped” microemulsion region is observed. Below one-phase microemulsion region, phase appears. The presence of NaCl decreases the domain size of micellar region whereas oxalic acid first decreases the domain below and then increases above in the lower boundary of the phase diagram. The critical weight fraction of water decreases in presence of both electrolytes. However, increases in presence of oxalic acid and remains constant in presence of NaCl as compared to salt-free system. Furthermore, when cyclohexane was replaced by a longer straight chain hydrocarbon, dodecane, the domain of the one-phase microemulsion region is tremendously increased.