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Abstract
AbstractStatic and dynamic light‐scattering measurements are made for colloidal‐crystals, ‐liquids and ‐gases of monodispersed polystyrene spheres, 109 nm in diameter, in the exhaustively, deionized suspension and in the presence of sodium chloride. Sharp peaks in the scattering curve are observed for the colloidal crystals in very diluted aqueous suspension. The product of the effective diffusion coefficient and the scattered light intensity is found constant over the whole range of the scattering angle measured for the colloidal crystals. Three and two dynamic processes have been extracted separately from time profiles of autocorrelation functions of colloidal crystals and liquids, respectively from the non‐negative least square analysis. Decay curves of colloidal gases are characterized by a single translational diffusion coefficient, D0. D0 of the gases at low ionic concentrations is lower than the calculation (Dc) from the Stokes‐Einstein equation with the true diameter of spheres, and increases and reaches Dc as ionic concentration increases. These experimental results emphasize the important role of the expanded electrical double layers on the diffusive properties in the colloidal crystals, liquids and gases.
Published Version
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