OIL-IN-WATER EMULSIONS 17 Cetyl Alcohol Emulsion Exo Endo I mv/cm I day 7 days -- 10 days I ,,I, I 1 20 4'0 60 80 100 ø C Figure 9. Emulsion prepared with cetrimonium bromide and pure cetyl alcohol: (a) differential scanning calorimetry as emulsion ages (b) emulsion after six months aging showing platy crystals.
18 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Exo 1:10 1:20 1:30 1:60 1:120 __ ,,, Endo I I I t 50 6•0 70 TEMPERATURE (øC) Figure 10. Differential scanning calorimetry scans of aged ternary ceteth 20/cetearyl alcohol/water systems. The numbers are the molar ratios of surfactant to alcohol (29). little as 1 mole % surfactant, there does appear to be a definite range of surfactant concentrations over which the ternary viscoelastic gel network phases form. Within the range, the relative proportions of the gel, crystalline, and bulk water phases change as surfactant concentration alters.
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