DYNAMICS OF VISCOUS AMPHIPHILIC FILMS SUPPORTED BY ELASTIC SOLID SUBSTRATES

The dynamics of amphiphilic films deposited on a solid surface is anal ysed for the case in which shear oscillations of the solid surface are excited. The two cases of surface and bulk shear waves are studied wi th the film exposed to a gas or to a liquid. By solving the correspond ing dispersion equation and the wave equation while maintaining the en ergy balance, we are able to connect the surface density and the shear viscosity of a fluid amphiphilic overlayer with the experimentally ac cessible damping coefficient, phase velocity, dissipation factor, and resonant frequency shifts of shear waves.