The surface tension of aqueous dilute solutions of sucrose monopalmitate was measured as a function of surfactant concentration at various temperatures under atmospheric pressure. Specific behavior was observed that not indicate the surface activity by a certain concentration below cmc.
Such specific behavior was also demonstrated by change in surface tension with time. At the concentrations lower than cmc, the surface tension was initially relatively low, gladually increased, and finally became essentially the same as that of pure water with time.
At the concentrations higher than cmc, the surface tension decreased with time and finally become a constant value. The existence of the concentration region which is not indicate surface activity is assumed that the sucrose fatty ester is not absorpt the vapor-liquid surface because of dominant incorporation of the sucrose into water structure.
