Abstract
A 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
