Quantitative 3D Visualization of the Growth of Individual Gypsum Microcrystals: Effect of Ca2+:SO42– Ratio on Kinetics and Crystal Morphology
Quantitative 3D Visualization of the Growth of Individual Gypsum Microcrystals: Effect of Ca2+:SO42– Ratio on Kinetics and Crystal Morphology
复制标题
单个石膏微晶生长的定量 3D 可视化：Ca2+:SO42– 比例对动力学和晶体形态的影响
DOI：
10.1021/acs.jpcc.7b01566
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发表时间：
2017
影响因子：
3.7
通讯作者：
P. Unwin
中科院分区：
文献类型：
--
作者：
Michael M. Mbogoro;M. Peruffo;M. Adobes;E. L. Field;M. O’Connell;P. Unwin
利用原子力显微镜（AFM）原位测量了石膏微晶（特征尺寸约为10 μm）的三维时间演化过程，研究了石膏晶体生长动力学。通过将这样的测量耦合到适定的扩散模型，可以容易地阐明质量传输对总速率的重要性。事实上，由于作为源或汇网站的微观界面的特点是固有的高扩散速率，它是可能的，在许多情况下，研究晶体生长质量传输的影响。在本研究中，一个特别的重点是阐明如何在恒定的过饱和度的Ca 2+的比例SO 42-离子的影响在石膏的主要晶面的生长速率。发现{100}和{001}晶面的生长对溶液化学计量比特别敏感，导致在富Ca ~（2+）溶液中形成针状晶体，在富SO_（42-）溶液中形成板状晶体。最大的增长率发生与化学计量的解决方案…
The kinetics of crystal growth of gypsum is determined by measuring the 3D time-evolution of isolated microcrystals (∼10 μm characteristic dimension) by in situ AFM. By coupling such measurements to a well-posed diffusion model, the importance of mass transport to the overall rate can be elucidated readily. Indeed, because microscale interfaces that act as source or sink sites are characterized by intrinsically high diffusion rates, it is possible to study crystal growth free from mass transport effects in many instances. In the present study, a particular focus is to elucidate how the ratio of Ca2+ to SO42– ions at constant supersaturation influences the rate of growth at the major crystal faces of gypsum. It is found that growth at the {100} and {001} faces, in particular, is highly sensitive to solution stoichiometry, resulting in needle-like crystals forming in Ca2+-rich solutions and plate-like crystals forming in SO42–-rich solutions. The maximum growth rate occurs with a stoichiometric solution of ...