Phase Behavior of Pseudo-Ternary Gemini Surfactant + 1-Hexanol/Oil/Water Systems

Corresponding Author

Mohd Zul Helmi Rozaini

[email protected]

School of Environmental Sciences, University of East Anglia, Norfolk, Norwich NR4 7TJ, UK uea.ac.uk

Department of Chemical Sciences, University Malaysia Terengganu, Terengganu 21030 Kuala, Terengganu, Malaysia umt.edu.my

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Mohd Zul Helmi Rozaini,

Corresponding Author

Mohd Zul Helmi Rozaini

[email protected]

School of Environmental Sciences, University of East Anglia, Norfolk, Norwich NR4 7TJ, UK uea.ac.uk

Department of Chemical Sciences, University Malaysia Terengganu, Terengganu 21030 Kuala, Terengganu, Malaysia umt.edu.my

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First published: 14 November 2012

https://doi.org/10.1155/2012/839074

Academic Editor: Ali Hussain Reshak

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Abstract

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, Φs = 40%, a “nose-shaped” microemulsion region is observed. Below one-phase microemulsion region, L_α phase appears. The presence of NaCl decreases the domain size of 1Φ micellar region whereas oxalic acid first decreases the domain below Φ_w < 18 and then increases above Φ_w > 18 in the lower boundary of the phase diagram. The critical weight fraction of water Φ_w^cri decreases in presence of both electrolytes. However, Φ_w^max 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.

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Phase Behavior of Pseudo-Ternary Gemini Surfactant + 1-Hexanol/Oil/Water Systems

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