In this paper, we reported an effective method for controlling CaSO4 crystal growth in organic media. Ca2+ and SO42− ions were extracted into the organic phase using different extractants. Different morphologies and sizes of CaSO4nanocrystals including nanoparticles and nanosheets and long fibers were prepared by changing the molar ratio of [SO42−]∶[Ca2+] in the organic solvent at room temperature. The effect of the molar ratio of [SO42−]∶[Ca2+] on the CaSO4 growth process was studied principally by TEM. In addition, it was found that the diluent polarity could also affect the growth process of CaSO4 crystals.
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