The solutions, which contained from 1 to 2.5 hydroxide ions added per aluminum ion, were studied immediately after preparation and also in the final equilibrium condition. Aggregates present in the freshly prepared solutions probably have a characteristic platelet shape. Mention is made of the possible importance of these platelet-shaped aggregates to the structure of freshly precipitated aluminum hydroxide gel. Estimates of the size of the clusters present in the aged solutions were obtained in terms of the radius-of-gyration parameter. For solutions with OH/Al ion ratios between 1.5 and 2.25, the parameter had a constant value of 4.3 Å. This value is in good agreement with the calculated radius of gyration for the complex [Al13O4(OH)24(H2O)12]7+.
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Rausch et al. (1964) studied this question.
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