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Atomic-scale processes at the fluorite-water interface visualized by frequency modulation atomic force microscopy 小林, 成貴 淺川, 雅 福間, 剛士 40595998 Kobayashi, Naritaka Itakura, Shiro 90509605 Asakawa, Hitoshi 90452094 Fukuma, Takeshi The crystal growth and dissolution processes of a fluorite (CaF 2) crystal have attracted much attention due to the importance in the industrial, environmental, and medical applications. While previous studies clarified nanoscale processes at the fluorite-water interface, atomic-scale origins of the processes have yet to be understood. In this study, we have investigated atomic-scale processes at the fluorite-water interface by frequency modulation atomic force microscopy (FM-AFM). We performed atomic-resolution imaging of a fluorite(111) surface in water (pH = 2 and 6.5), saturated solution (pH = 2 and 6), and supersaturated solution (pH = 6, σ = 10 and 100). Based on the results, we present three major findings. First, atomic-scale roughening of the crystal surface takes place at low pH due to the proton adsorption. Second, surface adsorbates with a subnanometer-scale height are formed on the crystal surface at high pH. They are most likely to be calcium hydroxo complexes physisorbed on the crystal surface. Finally, the formation of these complexes can be suppressed by increasing fluorite concentration owing to the increased proportion of Ca2+ and F- in the electric double layer. These findings mark an important step toward the full understanding of the physicochemical processes at the fluorite-water interface. © 2013 American Chemical Society. 金沢大学ナノ生命科学研究所 American Chemical Society 2013-11-21 2017-10-03 eng journal article AM https://doi.org/10.24517/00008491 http://hdl.handle.net/2297/36478 https://kanazawa-u.repo.nii.ac.jp/records/8504 10.24517/00008491 10.1021/jp4076228 AA1217589X 1932-7447 Journal of Physical Chemistry C 117 46 24388 24396 https://kanazawa-u.repo.nii.ac.jp/record/8504/files/TE-PR-FUKUMA-T-24388.pdf application/pdf 1.4 MB 2017-10-03