Abstract
Wetting films of nonionic F108 triblock copolymer aqueous solutions with concentrations below the CMC containing an electrolyte (NaCl) and formed on a quartz substrate are studied. Primary thick films are disclosed to be metastable. Their temporal stability is explained by the electrostatic repulsive forces. Film thinning and transition to a stable state occur slowly at low electrolyte concentrations (CNaCl = 10–5 and 10–3 M, respectively) and instantly at its high concentrations (CNaCl = 10–2 and 10–1 M, respectively). The stability of thin films is explained by the steric repulsive forces.
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