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J Phys Chem Lett ; 12(33): 8039-8045, 2021 Aug 26.
Article in English | MEDLINE | ID: mdl-34402624

ABSTRACT

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.


Subject(s)
Calcium Carbonate/chemistry , Microscopy, Atomic Force/methods , Nanostructures/chemistry , Adsorption , Crystallography , Molecular Structure , Solubility , Surface Properties , Water/chemistry
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