Abstract
Viscoelastic electro-optic properties of colloidal crystals of colloidal silica spheres in an exhaustively deionized aqueous suspension were studied by the reflection spectroscopy. Acoustic shear waves are induced when sine-wave electric fields ranging from 0.01 to 1 Hz are applied. The shear waves propagate outside the electrodes, where the electric field is absent. The whole suspension of colloidal crystals oscillates synchronously with a symmetry plane at the center of the electrodes. The phase differences observed around the cell are explained by the symmetric structure of the shear waves.
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