Kaolinite: Synthesis at Room Temperature

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Science  05 Mar 1971:
Vol. 171, Issue 3974, pp. 896-897
DOI: 10.1126/science.171.3974.896


To obtain kaolinite at low temperature and pressure from the system Si(OH)4-Al3+-H2O, the sixfold coordination of aluminum is a necessary prerequisite. Kaolinite was synthesized at pH values from 2 to 9 and with a ratio of SiO2 to Al2O3 in solution from 1 to 10 by means of the complexation of Al3+ and fulvic acid.