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Abstract
The effect of addition of methanol on the micellar behaviour of aqueous solutions of sodium dodecyl sulphate has been studied by light scattering measurements. At low alcohol concentration there is a small decrease in the critical micelle concentration but no change in micellar weight. With increasing alcohol concentration the critical micelle concentration increases and the micellar weight decreases, and at about a mole fraction of alcohol of 0.25 there is no evidence of micelle formation. Interpretation of the behaviour requires a knowledge as yet unknown of the part played by the changes in solvent structure and dielectric constant, and by the penetration of additive into the micelles.
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