Abstract
The influence of packing density of a polydisperse colloid system on the shape of the small-angle scattering curve and on the intensity of scattered radiation was studied experimentally. Twelve specimens of a finely divided alumina hydrate were prepared, their thickness being constant and their packing density increasing from 0.026 to 0.89. The shape of scattering curves did not vary much from one specimen to the other, as predicted by several authors. The intensity of scattered radiation was destroyed by the inter-particle interference as if the mass absorption coefficient was increased by a constant value. The average particle size of structural elements, as obtained from scattering curves by methods of Hosemann and Porod, increased with the packing density; this could be explained by the association of the particles in the process of pressing the material. The average size as obtained by the X-ray method is in rather good agreement with the average size of structural elements as shown by electron micrograph.
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