Kirpal, Dominik J. and Puerckhauer, Korbinian and Weymouth, Alfred J. and Giessibl, Franz J. (2019) Ion mobility and material transport on KBr in air as a function of the relative humidity. BEILSTEIN JOURNAL OF NANOTECHNOLOGY, 10. pp. 2084-2093. ISSN 2190-4286,
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Surfaces exposed to air can change their structure due to external influences such as chemical reactions or material exchange and movement. The adsorbed water layer that is present under ambient conditions plays an important role especially for highly soluble materials. Surface atoms can easily diffuse into the thin water layer and, when surface conditions are favorable, they can re-attach to the surface. We collected atomic force microscopy images of KBr surfaces in a humidity-controlled glove box at various relative humidities below 40%. By scratching and poking the surface with the AFM tip, we constructed energetically unfavorable holes or scratch sites and material accumulations and recorded the evolution of these defects as a function of the time. We observed an exponential decay of the size of the defects and material accumulations, and from this data we determined energy barriers to dissolution and aggregation of approximately 0.9 eV.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ATOMIC-FORCE MICROSCOPY; ALKALI-HALIDE SURFACES; WATER; GROWTH; ambient conditions; atomic force microscopy; material transport; relative humidity |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Mar 2020 07:41 |
| Last Modified: | 25 Mar 2020 07:41 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25961 |
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