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O: Fachverband Oberflächenphysik

O 121: Solid-Liquid Interface IV: Structure and Spectroscopy

O 121.6: Vortrag

Freitag, 20. März 2020, 12:00–12:15, TRE Phy

Investigation of ion mobility and material transport on KBr surfaces in air in dependence of the relative humidity. — •Dominik Kirpal, Korbinian Pürckhauer, and Franz J. Giessibl — University of Regensburg

On every surface exposed to humid air a thin film of water molecules forms. The presence of water plays an important role for chemical reactions, material exchange and movement. The effect of condensed water layer, present in ambient conditions plays a significant role especially on surfaces that dissolve easily in water [1]. Surface atoms can easily diffuse into the thin water layer and, when surface conditions are favourable, they can re-attach to the surface. We collected FM-AFM images of the KBr surface in a climate-controlled glove box at various values of relative humidity. By scratching the surface with the AFM tip, we construct energetically unfavourable hills and scratch sites. 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 [2].

[1] M. Luna, et al., Journal of Physical Chemistry A, 102.34 (1998) 6793-6800.

[2] D. Kirpal, et al. Beilstein Journal of Nanotechnology, 10.1 (2019): 2084-2093.