Abstract
To understand behavior of surface waves on sols and gels, the dispersion relation of surface modes on isotropic materials with both surface tension and elasticity is studied. The dispersion relation consists of two separate branches: one corresponds to the truly localized Rayleigh-type modes which can exist only at low frequencies, while the other, which is connected continuously to the capillary modes, gives pseudo-surface waves that are damped, radiating elastic transverse waves into the bulk of the medium just like the ones known in surface waves on elastically anisotropic materials. The result is compared with recent experiments on sols and gels.
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