Effect of Polyoxyethylene Type Nonionic Surfactant and Polar Lipophilic Oil on Solubilization of Mixed Surfactant Microemulsion Systems

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• 作者：Kaushik Kundu ; Bidyut K. Paul
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：September 12, 2013
• 年：2013
• 卷：58
• 期：9
• 页码：2668-2676
• 全文大小：395K
• 年卷期：v.58,no.9(September 12, 2013)
• ISSN：1520-5134

文摘

In the present report, the water solubilization capacity of water-in-oil microemulsion systems comprising mixed surfactants, that is, anionic sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and nonionic(s) [viz., polyoxyethylene (2) stearyl ether (Brij-72), polyoxyethylene (10) stearyl ether (Brij-76), polyoxyethylene (20) stearyl ether (Brij-78), polyoxyethylene (2) oleyl ether (Brij-92), polyoxyethylene (10) oleyl ether (Brij-97), and polyoxyethylene (20) oleyl ether (Brij-98)] was investigated in polar lipophilic oils [viz., ethyl myristate (EM), isopropyl myristate (IPM), and isopropyl palmitate (IPP)] with varying mole fractions of nonionic surfactant (X_nonionic) at a fixed surfactant concentration and 303 K. A maximum (i.e., synergism) in water solubilization (蠅_0,max) was observed at an optimal value of mole fraction of nonionic surfactant (X_nonionic,max). The solubilization efficiency parameter (SP*_water) and the free energy of dissolution (螖G⁰_s) were evaluated for these mixed systems. All of the physicochemical parameters for solubilization (viz., 蠅_0,max, X_nonionic,max, and SP*_water) were found to be dependent on both nonionic surfactants and oils. A minimum in 螖G⁰_s was observed at corresponding X_nonionic,max, where a maximum in SP*_water was evidenced. The IPP-based system was found to be most efficient, whereas the EM-based system was least efficient. An attempt was made to correlate the interdependence of physicochemical (蠅_0,max or SP*_water) and thermodynamic (螖G⁰_s) parameters.