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O: Fachverband Oberflächenphysik
O 54: Focus Session: Scanning Probe Microscopy with Quartz Sensors II
O 54.6: Vortrag
Mittwoch, 29. März 2023, 16:45–17:00, CHE 89
Atomic-scale imaging of muscovite mica and its interaction with water — •Giada Franceschi1, Pavel Kocan2, Andrea Conti1, Sebastian Brandstetter1, Jan Balajka1, Igor Sokolovic1, Jiri Pavelec1, Markus Valtiner1, Martin Setvin2, Florian Mittendorfer1, Michael Schmid1, and Ulrike Diebold1 — 1Inst. Appl. Phys., TU Wien, Wiedner Hauptstr. 8-10/E134, 1040 Vienna, Austria — 2Dept. Surface and Plasma Phys., Charles University in Prague, V Holesovickach 2, 180 00 Prague, Czech Republic
Muscovite mica is an abundant potassium aluminosilicate enjoying wide popularity in surface and interfacial science. Its prevalence is partly due to its extraordinary cleaving properties: The easily obtained atomically flat terraces are ideal for fundamental studies. To date, it is established that the cleaved surface is decorated by K+ ions,1 but their intrinsic ordering and their precise hydration mechanisms are not known. Here, we use non-contact atomic force microscopy to image the K+ distribution of cleaved mica and investigate their interaction with water under ultra-high vacuum conditions. After cleaving, the ions are arranged with short-range order, which we interpret with support from theory.2 Dosing water vapor at 100 K causes various hydration arrangements, consistent with previous theoretical studies, and clustering at increasing water coverage. Exposure to ultra-clean liquid water3 induces ion mobility and substitution by protons. [1] Christenson et al., Surf. Sci. Reports 71, 367 (2016). [2] Franceschi et al., submitted. [3] Balajka et al., Rev. Sci. Instrum. 89, 083906 (2018)