碳酸钙
无水的
碳酸盐
表面能
矿物学
碳酸盐矿物
纳米尺度
形态学(生物学)
地质学
化学工程
方解石
材料科学
化学
纳米技术
冶金
复合材料
古生物学
有机化学
工程类
摘要
Under earth surface conditions, in ocean and natural water, calcium carbonate is ubiquitous, forming anhydrous and hydrous minerals. These hydrous phases are of considerable interest for their role as precursors to stable carbonate minerals. Atomistic simulation techniques have been employed here to perform a comprehensive and quantitative study of the structural and energetic stability of dry and hydrous surfaces of calcium carbonate polymorphs using two recently developed forcefields. Results show that the dry forms are prone to ductility; while hydrous phases are found to be brittle. The (001) surface of monohydrocalcite appears to be the most stable (0.99 J/m(2)) whereas for the ikaite phase, the (001) surface is the most stable. The corresponding value is 0.2 J/m(2), i.e. even lower than the surface energy of the Beautiful computed morphology pictures are obtained with Xiao's model and are very similar to the observed SEM images.
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