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A light-scattering study has been made of the effect of concentration and temperature on the micellar size in a series of homogeneous non-ionic detergents in aqueous solution. It has been found that above the critical micelle concentration, as determined by surface tension measurements, an increase in micellar size takes place until a critical concentration is reached. Above this value, constant micellar molecular weights are observed for a finite concentration increase.All the compounds examined show an approximately exponential dependence of micellar molecular weight on temperature. The logarithmic temperature coefficients are similar for the higher homologues examined.

A study has been made of the effect of temperature on the size of xnicelles formed by a pure non-ionic detergent in aqueous solution. It has been shown by light-scattering measurements that the micelle molecular weight increases exponentially with increasing temperature, reaching a value of nearly two million close to the lower consolute temperature. Increase in size of the micelles has little influence on their solubilization properties, but viscosity studies indicate that the particle asymmetry increases as the molecular weight increases.

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