Resonant phenomena in colloidal crystals

Ahstmct: Colloidal crystals of completely deionized suspensions of latex speres are subjected to oscillatory and steady shear, as well as to homogeneous and inhomogeneous electric fields. Various resonant phenomena observed in such experiments are reported. Key words: Colloidal crystals; _shear resonances; elasticity; _shear flow; electric fields Colloidal crystals axe prepared from highly chaxg-ed monodisperse suspensions of polystyrene latex spheres in a continuous deionization circuit. Details of both materials used [I] and of the deionization setup [Z] axe given elsewhere. Resonant torsional and shear vibrations of crystals are detected by monitoring the amplitude of periodic shifts in the angle of Bragg scattered light as a function of he-quency 133 (Lock-in technique or FFT-frequenc