Abstract
Urick's theory of viscous liquid suspensions has been applied to investigate the ultrasonic wave properties in small-particle dispersed agarose gels. Based on the idea of apparent shear viscosity of the gel medium, the theoretically estimated velocity showed good agreement with the experimental data in the MHz range. The characteristic velocity decrease in viscous suspensions, due to the increase of volume concentration or density of particles, was also observed clearly in the particle-dispersed gels. This phenomenon becomes clearer in the region aβ≪7, where a is the radius of the particles and β is described by angular frequency ω, density ρ and fluid viscosity η.
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