Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2012 Vol: 4 Issue: 10

Micellar Properties of Linear Alkyl Benzene Sulphonate in Aqueous Glucose Solution

Abstract

The solution properties of linear alkyl benzene sulphonate (LABS) in water in presence of glucose have been investigated conductmetrically. The critical aggregation concentration (cac) and critical saturation concentration (csc) were determined. It has been observed that at low concentration of surfactant glucose interact with hydrophilic head group of surfactant molecules and form molecular aggregate/micelle like structure. The decrease in molar conductance, λm , with increasing concentration of glucose in post saturation region confirms the formation of LABS – glucose aggregate and the reported structure maker character of glucose in aqueous solution. The structure making character of glucose becomes more effective above 0.5 mol dm-3 concentration as the value of binding capacity tends to minimum value. The micellization of LABS in presence of aqueous glucose solutions has shown that the glucose behave as a weak electrolyte and can form aggregates through interactions with LABS. In aqueous solution, further increase in concentration of surfactant which corresponds to the saturation points beyond which micellization of surfactant follow a regular trend of post micellization like in water. It suggests the association and ionization of glucose – LABS aggregate / micelle, which is justified by the data of binding capacities at different concentration. The free energy of micellization in this study has same trend as it is reported for sodium dodecyl sulphate surfactant in glucose solution. The study may be a model to the surfactant systems which are applicable in interpretation of the biological, catalytic and industrial formulation of commercial importance.