Novel attempts for the synthesis of calcium sulfate hydrates in calcium chloride solutions under atmospheric conditions

Jen Chang Yang, Hong Da Wu, Nai Chia Teng, Dian Yu Ji, Sheng Yang Lee

研究成果: 雜誌貢獻文章同行評審

17 引文 斯高帕斯(Scopus)

摘要

The medical grade calcium sulfate is widely used in clinical applications for treating bone defects. A high-purity and predictable calcium sulfate (CS) synthesis process is desirable in the medical industry. The objective of this study was to develop a one-pot method for the direct preparation of calcium sulfate hemihydrates (CSHs; such as the α- and β-forms) in a CaCl2 solution. CS was synthesized by mixing K2SO 4 and Ca(NO3)2·4H2O under various CaCl2(aq) concentrations and reaction temperatures under atmospheric pressure. The calcium sulfate dihydrate (CSD) was found to be an intermediate phase that converts to CSH during the synthesis process, and α-CSH was gradually transformed from β-CSH over time. Moreover, the kinetic of CSD conversion to CSH was strongly accelerated by increasing the CaCl2 concentration. As the reaction temperature was fixed in 90 °C, the form of the CS reactant with an increase in the CaCl2 concentration was in the following sequence: CSD → CSD + β-CSH → CSD + β-CSH + α-CSH → α-CSH. In this study, the synthesis processing window of the CS reactant was established according the test results, and it is worth noting that all phases of CS hydrate could be synthesized with this system and well predicted by the constructed processing window.
原文英語
頁(從 - 到)381-387
頁數7
期刊Ceramics International
38
發行號1
DOIs
出版狀態已發佈 - 一月 2012

ASJC Scopus subject areas

  • 陶瓷和複合材料
  • 製程化學與技術
  • 電子、光磁材料
  • 表面、塗料和薄膜
  • 材料化學

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