Abstract
Acoustic attenuation and phase velocity in the frequency range 2−50 MHz have been measured in a series of silica sols and gels with different ionic strengths, to investigate the effect of interparticle forces on acoustic propagation. While sols and gels at the same concentration but at different ionic strengths have widely differing viscosities, no significant differences were found in the acoustic properties. By comparison with previously published work on neutron scattering in silica sols and gels, this suggests that ultrasonic propagation in these colloids is not sensitive to interparticle forces.
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