Particle-motion anomalies

Finally, Kirkwood Crampin (1981) showed that particle-motion anomalies are diagnostic of anisotropy and that the variations with period can be used to estimate the approximate depth of the anisotropic layer. This is best done using fundamental quasi-Love waves visible on the radial and vertical components, as they will not be contaminated by the later arriving Rayleigh waves (Yu Park 1994). 

Rowell and co-workers [62-64] have developed an electrophoretic fingerprint to uniquely characterize the properties of charged colloidal particles. They present contour diagrams of the electrophoretic mobility as a function of the suspension pH and specific conductance, pX. These fingerprints illustrate anomalies and specific characteristics of the charged colloidal surface. A more sophisticated electroacoustic measurement provides the particle size distribution and potential in a polydisperse suspension. Not limited to dilute suspensions, in this experiment, one characterizes the sonic waves generated by the motion of particles in an alternating electric field. O Brien and co-workers have an excellent review of this technique [65]. 

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