Micelle Formation of Purified Dinohylnaphthalenesulfonates in Benzene

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Abstract
The removal of trace amounts of unsulfonated dinonylnaphthalene contained in sulfonates by rubber membrane dialysis in pentane increased the apparent aggregation number of the micelles of dinonylnaphthalenesulfonate measured using vapor-pressure osmometry. The interaction between the cation and sulfonate ion was a factor affecting the aggregation, in addition to the steric factor of the hydrocarbon group and the solute-solvent interaction.