Citation: GAO Chuan-Hui, DONG Ya-Jie, REN Xiu, CHEN Ying, WANG Hui-Zi, HU Zun-Fu, WANG Jing, LIU Yue-Tao. Hydration Mechanism and Stability Regulation of Hemihydrate Calcium Sulfate Whiskers[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(5): 908-920. doi: 10.11862/CJIC.2020.099 shu

Hydration Mechanism and Stability Regulation of Hemihydrate Calcium Sulfate Whiskers

GAO Chuan-Hui ¹ ,
DONG Ya-Jie ¹ ,
REN Xiu ¹ ,
CHEN Ying ¹ ,
WANG Hui-Zi ¹ ,
HU Zun-Fu ² ,
WANG Jing ¹ ,
LIU Yue-Tao ^1,,

1.
State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
2.
College of Materials Science and Engineering, Linyi University, Linyi, Shandong 276000, China

Corresponding author: LIU Yue-Tao, yuetaoliu@qust.edu.cn
Received Date: 26 July 2019
Revised Date: 5 March 2020

Figures(12)

Hydration mechanism of hemihydrate calcium sulfate whisker (HCSW) was studied by discussing the change of morphology and crystal form in the storage process in the air, and the regulation of stability by different treatment methods was analyzed. It is found that the hydration of HCSW was caused by -OH group, Ca²⁺ active site at the surface and the internal channel inside of the whisker. Calcination and diol modification could improve the water resistance of calcium sulfate whisker. The experimental results indicate that after calcination, the hemihydrate calcium sulfate whisker are transformed into anhydrous soluble calcium sulfate whiskers and anhydrous dead calcium sulfate whiskers, the internal channels easy to hydration disappear, and the water resistance is enhanced. In the hydrothermal synthesis process, the addition of binary alcohol was beneficial to the adsorption of alcohol hydroxyl on the (200), (020) and (220) surfaces of HCSW, preventing the adsorption of hydroxyl in H₂O molecules on the whisker surface, and further improving the water resistance of the whisker. When the additive was triethylene glycol (TEG) and the concentration was 18.8 mmol·L^-1, the water resistance stability of HSCW in the air was not less than 7 days.
- hemihydrate calcium sulfate whisker,
- hydration,
- calcination,
- triethylene glycol
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