近环境条件下水合碳酸镁的生长和转化

IF 3.2 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Ian Shortt, Vikram Gopalan, Jared Ura, Dylan Singh, Gaurav Sant and Erika La Plante*, 
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引用次数: 0

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本文章由计算机程序翻译,如有差异,请以英文原文为准。

Growth and Transformation of Hydrated Magnesium Carbonates under Near-Ambient Conditions

Growth and Transformation of Hydrated Magnesium Carbonates under Near-Ambient Conditions

Concrete composed of magnesium carbonates not only exhibits the potential for greater strength but also offers reduced carbon dioxide emissions compared with conventional concrete made with ordinary Portland cement. In a series of experiments conducted at various saturation ratios and near-ambient temperatures, hydrated magnesium carbonate phases were precipitated and subsequently analyzed by using a range of spectroscopic techniques. Hydrated magnesium carbonates, including nesquehonite (MgCO3·3H2O) and hydromagnesite (Mg5(CO3)4(OH)2·4H2O), formed readily from the growth solutions. Time-resolved analysis using atomic force microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy revealed a correlation between the degree of solution supersaturation with respect to hydromagnesite and the delay in the transition from early-stage nesquehonite to hydromagnesite, suggesting that the increased concentration of magnesium cations impeded phase evolution. Furthermore, the introduction of the additives RbCl and CsCl accelerated this transformation. These observations can be explained by considering the influences of the ions in solution on the magnesium ion’s dehydration energy. These findings are significant because they demonstrate a pathway for phase selection during magnesium carbonate precipitation at near-ambient temperatures. The results of this study have implications for carbon dioxide mineralization and the design of concrete that gains strength through the precipitation of magnesium carbonates.

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来源期刊
Crystal Growth & Design
Crystal Growth & Design 化学-材料科学:综合
CiteScore
6.30
自引率
10.50%
发文量
650
审稿时长
1.9 months
期刊介绍: The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials. Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.
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