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Relaxation Studies of the Adsorption-Desorption Equilibrium of Surfactants on the Gas-Liquid Interface. I. Theoretical Studies

1977; Oxford University Press; Volume: 50; Issue: 4 Linguagem: Inglês

10.1246/bcsj.50.852

1348-0634

Minoru Sasaki, Tatsuya Yasunaga, Nobuhide Tatsumoto,

Adsorption, diffusion, and thermodynamic properties of materials

Abstract A general theory for the propagation characteristics of the capillary wave on the gas-liquid interface, where the physicochemical equilibrium exists, is proposed. The theory is developed on the basis of the two-dimensional relaxation theory and the surface thermodynamics. The relaxation parameters in the equations are closely related to the dynamic behavior of the equilibrium. As an example, the theory was applied to the surfactant solution, taking account of the adsorption-desorption and diffusion processes of the surfactant. The derived equations revealed that the adsorption-desorption process plays an important role in the surfactant transfer between the surface and the bulk phase in a concentrated surfactant solution, while the diffusion process plays such a role in a dilute solution.