Effect of Liquid Crystalline Material on Stability of Nonaqueous Foam
Stability of foam in nonaqueous solution using phase equillibria of nonionic surfactant (EMU 050), water, and hexadecane has been described. Liquid crystalline phase in the presence of liquid phase was found to enhance the stability of foam. Foam drainage and breakage were studied in mixtures having different ratios of liquid crystal and isotropic solution, separated from compositions with different amounts of nonionic surfactant, water, and hexadecane. An empirical equation: V1= at/(l + bt) was found applicable to the data of foam drainage. Foam breakage was treated as a chemical reaction which stopped before final thermodynamic equilibrium was reached.
A model for foam stability in presence of lamellar liquid crystal and isotropic solution is suggested.
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