Abstract
The effect of dilution with water on surfactant-oil mixtures was studied with the temperature scan method. The results obtained led to an assumption of the stability of solubilized preperations diluted with water. Triton X-100-xylene mixtures in definite proportions were diluted stepwisely with water and the solubilization temperatures at each dilution were measured (Fig. 1). Variations in solubilization temperature with surfactant concentrations appeared markedly in S°1 and G°1, but not so markedly in S°2 and G°2 (Table I, II, and III). It was suggested that an increase in the concentration of a surfactant in solubilized solution improved the stability in a low-temperature region, but not in a high-temperature region. Changes in clarity or Winsor's type in solubilized preperations being diluted with water at a constant temperature (25°) were shown in Table IV.
