一步水热法制备无水硫酸钙晶须  

Preparation of Anhydrous Calcium Sulfate Whisker by One-step Hydrothermal Method

作　　者：吕智慧[1,2] 乃学瑛[1] 朱东海[1] 董亚萍[1] 李武[1] 

机构地区：[1]中国科学院青海盐湖研究所,西宁810008 [2]中国科学院大学,北京100049

出　　处：《人工晶体学报》2016年第3期612-617,共6页Journal of Synthetic Crystals

基　　金：青海省科技厅项目应用基础研究计划(2015-ZJ-737)

摘　　要：以生石膏为原料,六水氯化镁为形貌控制剂,采用水热法一步合成了无水硫酸钙晶须。借助SEM、TEM、XRD和XPS等测试手段考察了水热条件对无水硫酸钙晶须的影响,研究了无水硫酸钙晶须的生长过程。结果表明:镁/钙摩尔比n（Mg Cl2·6H2O）/n（Ca SO4·2H2O）=2.5,反应温度180℃,反应时间2 h,可生长出长度为2040μm,直径0.52μm的无水硫酸钙晶须。无水硫酸钙晶须生长过程为:片状Ca SO4·2H2O-纤维状Ca SO4·0.5H2O-纤维状Ca SO4。The anhydrous calcium sulfate whisker was successfully synthesized using gypsum as raw material and magnesium chloride hexahydrate as the morphology control agent under hydrothermal condition. The influence of reaction condition on whisker and the growth process were studied through scanning electron microscopy,filed emission transmission electron microscopy,X-ray diffractometer and X-ray photoelectron spectroscopy. The experiment results show that,when the mole ratio of Mg Cl_2/ Ca SO_4 is 2. 5,and the reaction temperature is controlled above 180 ℃ for 2 h,anhydrous calcium sulfate whisker can be formed with diameters of 0. 5-2. 0 μm and lengths of 20-40 μm. The process of Ca SO4 whiskers was plate-like Ca SO4·2H_2O to needle-like Ca SO4·0. 5H_2 O,finally to fibre-like Ca SO_4.

关 键 词：无水硫酸钙晶须 水热法 六水氯化镁 

分 类 号：TQ132.32[化学工程—无机化工] O78[理学—晶体学]