Micellization of AOT in aqueous sodium chloride, sodium acetate, sodium propionate, and sodium butyrate media: a case of two different concentration regions of counterion binding

Journal of Colloid and Interface Science
I M Umlong, K Ismail

Abstract

Critical micelle concentrations of AOT in water in the presence of sodium chloride, sodium acetate, sodium propionate, and sodium butyrate were determined at 25 degrees C by the surface tension method. The co-ions do not have any effect on the value of critical micelle concentration. The surface density of AOT at the air-water interface increases in the presence of added electrolyte and attains a maximum value of 2.5+/-0.1 mol m-2 at a particular electrolyte concentration which is different for sodium chloride and the other three electrolytes. From the Corrin-Harkins plot it has been found that for AOT micelles the counterion binding constant has values 0.40 and 0.82 below and above approximately 0.015 mol kg-1 electrolyte concentration (c*), respectively. Measurement of sodium ion activity from the EMF method has confirmed such a shift in the counterion binding constant of AOT at c*. The higher value of the counterion binding constant for AOT has been reported for the first time. From fluorescence spectroscopy it has been found that the aggregation number of AOT is 22 in water and its average aggregation numbers in the presence of electrolytes are about 34 and 136 below and above c*, respectively. The increase by a factor of 2...Continue Reading

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Citations

Sep 23, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·J DeyK Ismail
Sep 15, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Angel OrteJose M Alvarez-Pez
Jul 6, 2013·Journal of Colloid and Interface Science·U Thapa, K Ismail
Oct 19, 2010·Journal of Colloid and Interface Science·Hongjun JiXiaxi Yao
Apr 2, 2008·Advances in Colloid and Interface Science·Rami Abdel-Rahem
Feb 16, 2008·Journal of Colloid and Interface Science·Pierre LetellierMireille Turmine
Feb 17, 2007·Journal of Contaminant Hydrology·James L HogganTohren C G Kibbey
Oct 15, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Antonio Pereira, Serafim Kalliadasis
Dec 23, 2008·The Journal of Physical Chemistry. B·K Jagajjanani Rao, Santanu Paria
Aug 26, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Maja S HellsingArwel V Hughes
Jul 15, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew P CarpenterGeraldine L Richmond
Jul 9, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Z-G CuiB P Binks
Sep 13, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Cristian M O LéporiM Luisa Moyá
Aug 25, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Cristian M O LéporiM Luisa Moyá

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