P R Williams and S R Ren 1996 J. Phys. D: Appl. Phys. 29 2718 doi:10.1088/0022-3727/29/10/027
P R Williams and S R Ren
Show affiliationsA new technique involving high-frequency shear wave interferometry has been used to investigate the viscoelastic properties of gels formed from aqueous dispersions of a synthetic hectorite-type clay colloid. The technique facilitates studies of stress relaxation phenomena under a range of strains and strain rates, in both linear and nonlinear deformation regimes. Measurements of the group and phase velocities of frequency-multiplexed shear waves, conducted in the presence and absence of steady shear fields, provide visco elastic-solid-like relaxation spectra. Under shear, the relaxation spectra indicate a trend to fluidization of the system as shear rate increases. A viscoelastic solid model is used to interpret the wave dispersion and the results, which constitute the first rheometrical exploitation of the `beat' phenomenon, support conclusions drawn from light scattering and small-angle neutron scattering studies concerning the origin of viscoelasticity in this system.
62.40.+i Anelasticity, internal friction, stress relaxation, and mechanical resonances
83.80.Hj Suspensions, dispersions, pastes, slurries, colloids
Soft matter, liquids and polymers
Issue 10 (14 October 1996)
Received 1 April 1996
P R Williams and S R Ren 1996 J. Phys. D: Appl. Phys. 29 2718
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