作为石成长中的杂质Mg2+的作用
K J Davis1, P M Dove, J J De Yoreo
1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
概括
在碳酸 (CaCO3) 晶体中加入,通过增加矿物质溶解度来抑制生长. 这项分子水平的研究揭示了如何影响石的形成,将微观发现与宏观观测联系起来.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 晶体学 晶体学是指结晶学.
背景情况:
- (Mg) 显著影响碳酸 (CaCO3) 矿化.
- 宏观研究缺乏明确的物理机制来解释对碳酸盐生长的影响.
研究的目的:
- 阐明对酸盐抑制的分子尺度机制.
- 用原子力显微镜来确定Mg对石形成的热力学和动力学控制.
主要方法:
- 原子力显微镜 (AFM) 用于在分子水平上观察石的生长.
- 在石灰岩生长螺旋上测量步骤速度和露台宽度.
- 从显微镜观察中确定Ca(1-x) Mg(x) CO3的溶解度.
主要成果:
- 由于Mg的结合而增加的矿物溶解性被确定为酸盐生长的主要抑制剂.
- 测量结果显示,由Mg加入引起的有效超和率下降.
- 微观步骤动态提供了Ca{1-x) Mg{x) CO3.3的定量溶解度数据.
结论:
- 通过增加溶解度和减少分子水平的有效超和来抑制石的生长.
- AFM提供了分子尺度机制和宏观观观察Mg控制的CaCO3矿化之间的直接联系.
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