Formation process of calcium carbonate from highly supersaturated solution
Formation process of calcium carbonate from highly supersaturated solution
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DOI：
10.1016/s0022-0248(01)01866-8
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发表时间：
2002-04-01
影响因子：
1.8
通讯作者：
Aikawa, N
中科院分区：
文献类型：
--
作者：
Kawano, J;Shimobayashi, N;Aikawa, N
在光学显微镜和红外显微光谱仪下，通过混合CaCl2和Na2CO3水溶液，在20 ℃左右原位观察了碳酸钙在高过饱和溶液中的沉淀过程。在无定形相形成之后，球粒状球霰石和菱面体形状的方解石同时但单独地成核，并且通过在它们周围形成无沉淀物区而生长。这种转化是溶剂介导的，并且生长速率的测量表明，速率控制过程是在该过程的早期阶段的元素的扩散，然后转变为表面动力学。(C)2002 Elsevier Science B.V.保留所有权利。
The precipitation process of calcium carbonate front highly supersaturated solutions was observed in situ by mixing CaCl2 and Na2CO3 aqueous solutions at about 20degreesC under an optical microscope and an infrared microspectroscope. After an amorphous phase forms, spherulitic vaterite and calcite in a rhombohedral shape nucleate simultaneously but separately, and grow by forming the precipitate-free zone around them. This transformation is solvent-mediated, and the measurement of the growth rate suggests that the rate-control ling process is the diffusion of elements in the earlier stage of this process, which then changes to surface kinetics. (C) 2002 Elsevier Science B.V. All rights reserved.