High-Speed Atomic Force Microscopy of the Structure and Dynamics of Calcite Nanoscale Etch Pits
High-Speed Atomic Force Microscopy of the Structure and Dynamics of Calcite Nanoscale Etch Pits
复制标题
方解石纳米级蚀刻坑的结构和动力学的高速原子力显微镜
DOI：
10.1021/acs.jpclett.1c02088
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Fukuma Takeshi
中科院分区：
文献类型：
--
作者：
Miyata Kazuki;Takeuchi Kazuyoshi;Kawagoe Yuta;Spijker Peter;Tracey John;Foster Adam S.;Fukuma Takeshi
方解石溶解是由形成一个纳米级的蚀刻坑，然后由步骤边缘传播，因此强烈的表面扩散离子和步骤边缘之间的相互作用的影响。然而，这种原子尺度的动力学大多是无法用目前的成像工具。在这里，我们克服了这一限制，使用我们最近开发的高速调频原子力显微镜。通过观察水中方解石表面腐蚀坑的原子尺度结构变化，我们发现腐蚀坑中存在移动的和低移动的表面吸附层（SAL）。我们还发现，一些蚀坑保持其尺寸很长一段时间没有扩大，和他们的台阶边缘往往与较少的移动SAL，这表明他们的台阶稳定效果。
Calcite dissolution is initiated by the formation of a nanoscale etch pit followed by step edge propagation and hence strongly influenced by the interactions between surface diffusing ions and step edges. However, such atomic-scale dynamics are mostly inaccessible with current imaging tools. Here, we overcome this limitation by using our recent development of high-speed frequency modulation atomic force microscopy. By visualizing atomic-scale structural changes of the etch pits at the calcite surface in water, we found the existence of mobile and less-mobile surface adsorption layers (SALs) in the etch pits. We also found that some etch pits maintain their size for a long time without expansion, and their step edges are often associated with less-mobile SALs, suggesting their step stabilization effect.