Prediction of Solubility of Nonpolar Gases in Micellar Solutions of Ionic Surfactants

Journal of Colloid and Interface Science
S RoyD Bhowmick

Abstract

The solubilities of methane, carbon dioxide, ethane, and propane have been determined experimentally at 1 atm partial pressure and 25°C in aqueous solutions of sodium dodecyl sulfate and cetyltrimethylammonium bromide. For this purpose a specially developed apparatus is used, which is relatively simple compared to those reported in the literature hitherto. Above the CMC, the solubility of each gas increases linearly with surfactant concentration indicating micellar solubilization. The degree of solubilization is greatest for propane and decreases in the order propane > ethane > carbon dioxide > methane. Both the length of the alkyl chain and the properties of the head-group region (i.e., the micelle-water interfacial tension) are observed to determine the intramicellar solubility. A method for estimating the solubilities is also proposed based on the rationale that the micellar phase may be represented by a droplet of a "model solvent" into which the solubilizate molecule dissolves as it would in a bulk solvent. The mixture of the solute species and the model solvent is assumed to behave as a regular solution. Accordingly, a characteristic solubility parameter is estimated for the model solvent from the interaction potentia...Continue Reading

References

Nov 1, 1968·The Journal of Pharmacy and Pharmacology·P H Elworthy, F J Lipscomb
Jul 30, 1955·Journal of the American Medical Association·W B HILDEBRAND
Feb 1, 1973·Proceedings of the National Academy of Sciences of the United States of America·R Smith, C Tanford

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Citations

Jun 23, 2009·Journal of Colloid and Interface Science·Xuan QuAnh V Nguyen
Aug 8, 2007·Journal of Colloid and Interface Science·J S ZhangJae W Lee
Jun 3, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·John M O'CallaghanJustin D Holmes
Sep 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Pramith PriyanandaGregory G Warr
Feb 13, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·John M O'CallaghanJustin D Holmes

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