Abstract
Abstract The wettability of the paraffin by aqueous solutions of sodium decyl, dodecyl and tetradecyl sulfate have been studied. A slight but distinct discontinuity of the slope in the curve of the cosine of the receding contact angle vs. the surface tension of the solution was observed for the solution of sodium decyl, dodecyl and tetradecyl sulfate. The discontinuity of the slope appeared at the surface tension of about 40 dyn./cm. It was found that the wetting isotherm which had been proposed by the present author, and which had been found valid for the wetting of paraffin by the aqueous solution of fatty alcohol homologues, was also valid for this experiment in the dilute aqueous solution of sodium alkyl sulfates. The adsorption energy was 588.9 cal./mol. CH2 and 534.7 cal./ mol. for the paraffin/solution and air/solution interfaces respectively.
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