Abstract
In this preliminary series of experiments, calcium sulphate dihydrate has been allowed to crystallize spontaneously from solutions of varying degrees of supersaturation, and induction periods and rate constants have been determined. The effect of crystal area, pH, and accelerators and retarders on this process has been examined. The degree of super-saturation has a direct effect on both the induction period and rate constant. Nucleation is affected markedly by pH. Salts having an ion in common with calcium sulphate function as accelerators. Retarders affect the induction period in proportion to their concentration, but show little, if any, effect on the rate of crystallization. The behavior of the various reagents under the conditions prevailing in these experiments is largely in accord with observations on the behavior of commercial plasters.
Publisher
Canadian Science Publishing
Subject
Organic Chemistry,General Chemistry,Catalysis
Cited by
32 articles.
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