摘要
The influence of Na2HPO4·12H2O on the hydrothermal formation of hemihydrate calcium sulfate（CaSO4·0.5H2O） whiskers from dihydrate calcium sulfate（CaSO4·2H2O）at 135 ℃ was investigated.Experimental results indicate that the addition of phosphorus accelerates the hydrothermal conversion of CaSO4·2H2O to CaSO4·0.5H2O via the formation of Ca3（PO4）2 and produces CaSO4-0.5H2O whiskers with thinner diameters and shorter lengths.Compared with the blank experiment without Na2HPO4·12H2O,the existence of minor amounts（8.65 ×10-4-4.36 × 10-3 mol/L） of Na2HPO4·12H2O led to a decrease in the diameter of CaSO4·0.5H2O whiskers from 1.0-10.0 to 0.5-2.0 μm and lengths from 70-300 to50-200 μm.
The influence of Na2HPO4·12H2O on the hydrothermal formation of hemihydrate calcium sulfate（CaSO4·0.5H2O） whiskers from dihydrate calcium sulfate（CaSO4·2H2O）at 135 ℃ was investigated.Experimental results indicate that the addition of phosphorus accelerates the hydrothermal conversion of CaSO4·2H2O to CaSO4·0.5H2O via the formation of Ca3（PO4）2 and produces CaSO4-0.5H2O whiskers with thinner diameters and shorter lengths.Compared with the blank experiment without Na2HPO4·12H2O,the existence of minor amounts（8.65 ×10-4-4.36 × 10-3 mol/L） of Na2HPO4·12H2O led to a decrease in the diameter of CaSO4·0.5H2O whiskers from 1.0-10.0 to 0.5-2.0 μm and lengths from 70-300 to50-200 μm.
基金
supported by the National Science Foundation of China(No.51234003,No.51174125 and No.51374138)
National Hi-Tech Research and Development Program of China(863 Program,2012AA061602)
