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This paper discussed the influence of the process parameters such as the temperature, the mixing ways, and the molar ratios of the reactants on the morphology of the CaSO4 ċ 2H2O precursors and the CaSO4 ċ 0.5H2O whiskers. The experimental results indicated that CaSO4 ċ 0.5H2O whiskers with a length of 80-310 µm and a width of 0.8-8.0 µm were produced at hydrothermal condition, using CaSO4 ċ 2H2O fine particles as the precursors which were formed by adding Na2SO4 solution into CaCl2 solution at 25°C at the molar ratio of Na2SO4 to CaCl2 being 0.5 : 1. A lower supersaturation and a higher [Ca2+]/[SO42-] molar ratio favored the formation of CaSO4 ċ 2H2O particles with small sizes and the hydrothermal synthesis of CaSO4 ċ 0.5H2O whiskers with high aspect ratios.

Influence of the Process Parameters on the Formation of CaSO4·0.5H2O Whiskers

Influence of the Process Parameters on the Formation of CaSO₄·0.5H₂O Whiskers