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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Amorphous calcium carbonate ： ウィキペディア英語版 Amorphous calcium carbonate Amorphous calcium carbonate (ACC) is the amorphous and least stable polymorph of calcium carbonate. ACC is monohydrate and is so unstable under normal conditions that aside from several specialized organisms it is not found naturally. ACC has been known to science for over 100 years when a non diffraction formula of calcium carbonate was discovered by Sturcke Herman. ==Stability== ACC is the sixth and least stable polymorph of calcium carbonate. The remaining five polymorphs (in decreasing stability) are: calcite, aragonite, vaterite, monohydrocalcite and ikaite. When mixing two supersaturated solutions of calcium chloride and sodium carbonate these polymorphs will precipitate from solution following Ostwald's step rule, which states that the least stable polymorph will precipitate first. But while ACC is the first product to precipitate, it rapidly transforms into one of the more stable polymorphs within seconds.〔Rodriguez-Blanco, J.D., Shaw, S. and Benning, L.G. (2011) The kinetics and mechanisms of Amorphous Calcium Carbonate (ACC) crystallization to calcite, via vaterite. Nanoscale, 3, 265-271. doi: 10.1039/c0nr00589d〕〔Bots, P., Rodriguez-Blanco, J.D., Roncal-Herrero, T., Benning, L.G. and Shaw, S. (2012) Mechanistic insights into the crystallization of amorphous calcium carbonate to vaterite. Crystal Growth and Design, 12, 3806-3814. doi: 10.1021/cg300676b.〕 That is why ACC is not found naturally. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Amorphous calcium carbonate」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.