https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=31459855&retmode=xml&tool=Litmetric&email=readroberts32@gmail.com&api_key=61f08fa0b96a73de8c900d749fcb997acc09 3145985520231013
2470-1343442019Apr30ACS omegaACS OmegaDehydration Pathways of Gypsum and the Rehydration Mechanism of Soluble Anhydrite γ-CaSO4.763676427636-764210.1021/acsomega.8b03476The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was also studied by Monte Carlo (MC) simulations. The thermodynamic calculation results reveal that the dehydration mechanism of gypsum significantly depended on ambient temperature and water vapor pressure. In the high-temperature and low water vapor pressure region, gypsum dehydrates to form γ-CaSO4 in a single-step process (CaSO4·2H2O → γ-CaSO4); with increasing water vapor pressure, gypsum undergoes the CaSO4·2H2O → γ-CaSO4 → β-CaSO4·0.5H2O reaction path and as water vapor pressure increases further, the occurrence of a two-step conversion path CaSO4·2H2O → β-CaSO4·0.5H2O → γ-CaSO4 was observed. It was also found that gypsum is stable in the low-temperature and high water vapor pressure region and does not dehydrate to form any calcium sulfate hemihydrate. Finally, the rehydration mechanism of soluble anhydrite was studied by MC simulations. The simulation results are in agreement with the experimental data and support the finding that γ-CaSO4 rehydration forms CaSO4·0.67H2O in high relative humidity. Another important result revealed by the MC simulation is that γ-CaSO4 has an extraordinary ability to capture water molecules from an extremely dry atmosphere, which is very useful in some fields, such as in drying processes and even for extracting liquid water from extremely dry atmosphere.TangYongboYSchool of Materials Science and Engineering, Southeast University, Nanjing 211189, China.GaoJianmingJSchool of Materials Science and Engineering, Southeast University, Nanjing 211189, China.JiangSu Key Laboratory of Construction Materials, Nanjing 211189, China.LiuChuanbeiCSchool of Materials Science and Engineering, Southeast University, Nanjing 211189, China.ChenXuemeiXSchool of Materials Science and Engineering, Southeast University, Nanjing 211189, China.ZhaoYasongYSchool of Materials Science and Engineering, Southeast University, Nanjing 211189, China.engJournal Article20190426
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