The Surface Tension and the Critical Micelle Concentration in Aqueous Solution of β- d -Alkyl Glucosides and their Mixtures

Abstract

The surface tension in aqueous solutions of β-d-alkyl glucoside and their mixtures at 25°C has been measured. The CMC was determined from the inflexions of the curves; octyl glucoside, 0.025 mol./1., decyl glucoside 0.0022 mol./1., dodecyl glucoside, 0.00019 mol./1. The effect of hydrocarbon chain length was explained theoretically. The CMC of mixtures has been also explained by the extension of the theory of ionic agents. The effect of added sodium chloride, calcium chloride and sodium sulfate on the surface tension in aqueous solution of octyl glucoside has been measured. The effect of added salts on the CMC was determined from the inflexions of the surface tension vs. logarithm of concentration curves.