FOAM STABILITY - HE EFFECT OP A LIQUID CRYSTALLINE PHASE ON THE DRAINAGE AND TRANSITION BEHAVIOR OF FOAM FILMS

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Abstract
The effects of a liquid crystalline phase on the drainage and on-set of black film transitions in microscopic foam films are investigated using interference microscopic technique. The drainage time, critical thickness and/or equilibrium thickness of aqueous films formed from Texas #1 (sodium 8-phenyl-n-hexadecyl-p-sulfonate) and sodium dodecylsulfate solutions are measured as a function of surfactant concentration, ionic strength, aging of the system and addition of short chain alkyl alcohols. The experimental data are correlated with the bulk and surface viscosity measurements for the solutions. The experimental results are interpreted in terms of the relative importance of the van der Waals' compression versus electrostatic and structural repulsion forces on the film dynamics.

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