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Kinetics of spontaneous precipitation of calcium sulfate dihydrate

They have established a precise measuring-calculating system to determine the variation of concentration for all species in the super saturated solution of calcium sulfate dihydrate(CSD).Judging the relationship between critical time and supersaturation, They have calculated the free surface energy of CSD to be 21.5 mJ/m 2 in the experimental conditions.Based on the theory of thermodynamics, classic theory of precipitation kinetics and the value of free surface energy, they have also got some values in critical phase,such as critical radius of nucleus、number of particles in critical nucleus. The good linear relationship between index I d and time indicates that the process of CSD precipitation is mainly controlled by diffusion mechanism.