A Hidden Variable in the Rate of Growth During Crystallization of Salts and Precipitation of Minerals

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• 作者：Frank Crundwell ; ^{frank.crundwell@cm-solutions.co.za}
• 关键词：crystallization ; precipitation ; kinetics ; rate ; growth
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：578-581
• 全文大小：148 K
• 卷排序：17

文摘

The currently accepted models of crystallization cannot explain how the stoichiometry of the growth of a crystal or a precipitate is established, nor can they explain the development of an interfacial surface potential, which is detected as a zeta potential even in saturated brines. The change in potential across the Stern layer is dependent on the difference in the rate of deposition of cations and anions. This realization and the subsequent stability analysis around the point of stoichiometric deposition leads to the conclusions that the potential difference across the interface is a controlling factor, that this variable is hidden in the sense that it does not appear in the overall rate expression, and that stoichiometry is established as a consequence of the dependence of the rate of deposition of cations and anions on the potential.