Abstract
By using electrically excited surface waves we have studied the propagation of hydrodynamic modes on the surface of agarose gels in the frequency range ${10}^{1}--{10}^{3}\mathrm{Hz}$. Bulk rheological behavior has been also determined in the frequency range ${10}^{\ensuremath{-}2}--{10}^{2}\mathrm{Hz}$ by conventional rheometry. The propagation of two surface modes, capillary and elastic, is observed at low frequencies. Above a well defined crossover frequency, regular capillary behavior is observed. The experimental data are in excellent agreement with the theoretical predictions and the measured bulk viscoelastic behavior.
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