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Physicochemical Investigation of Biocompatible Mixed Surfactant Reverse Micelles: III. Aqueous NaCl Solubilization, Thermodynamic Parameters of Desolubilization Process and Conductometric Studies

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Journal of Surfactants and Detergents

Abstract

Solubilization of water and aqueous NaCl in mixed reverse micelles (RMs) comprising sodium bis(2-ethylhexyl) sulfosuccinate (AOT), and polyoxyethylene (20) sorbitan trioleate or polyoxyethylene (20) sorbitan monooleate has been studied at different compositions (X nonionic = 0–1.0) at a total surfactant concentration, S T = 0.10 × 103 mol m−3 in biocompatible oils of different chemical structures; viz., ethyl oleate (EO), isopropyl myristate (IPM) and isopropyl palmitate (IPP) at 303 K. The enhancement in water solubilization (i.e., synergism) has been evidenced by the addition of nonionic surfactant to dioctyl sulfosuccinate/oil(s)/water systems. Addition of NaCl in these systems at different X nonionic enhances their solubilization capacities further until a maximum, ω NaCl,max is reached. ω NaCl,max and [NaCl]max (concentration at which maximization of NaCl solubilization occurs) depend on type of nonionic surfactant, its content (Xnonionic) and oil. A new solubilization efficiency parameter (SP*water or SP*NaCl) has been proposed to compare solubilization phenomena in these oils. The energetic parameters of the desolubilization process of water or aqueous NaCl in single and mixed RMs have been estimated. Energetically, the water dissolution process in oil has been found to be more exothermic as well as more organized in IPP. Overall, the dissolution of water and aqueous NaCl in mixed RMs is entropically driven process. Conductance behavior of these systems in the presence of NaCl has been investigated under different [NaCl] at 303 K. An attempt has been made to give an insight to the mechanism of solubilization phenomena, percolation in conductance and microstructures vis-à-vis role of biocompatible oils in these systems.

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Acknowledgments

Financial support in the form of an operating research grant to B.K.P. and Senior Research Fellowship to K.K. from the authority of Indian Statistical Institute, Kolkata, India is thankfully acknowledged.

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  1. Surface and Colloid Science Laboratory, Geological Studies Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata, 700 108, India

    Kaushik Kundu & Bidyut K. Paul

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  1. Kaushik Kundu
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Correspondence to Bidyut K. Paul.

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Kundu, K., Paul, B.K. Physicochemical Investigation of Biocompatible Mixed Surfactant Reverse Micelles: III. Aqueous NaCl Solubilization, Thermodynamic Parameters of Desolubilization Process and Conductometric Studies. J Surfact Deterg 16, 865–879 (2013). https://doi.org/10.1007/s11743-013-1473-1

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