Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Oxides and Insulator Surfaces: Adsorption and Reaction of Small Molecules II
O 63.3: Vortrag
Mittwoch, 19. März 2025, 11:00–11:15, H25
Desorption of water from microcline (001) — Tobias Dickbreder1,2, Florian Schneider1, Lea Klausfering1, Kim Noelle Dreier1, Franziska Sabath1,3, Adam S. Foster4, Ralf Bechstein1, and •Angelika Kühnle1 — 1Bielefeld University, 33615 Bielefeld, Germany — 2University of Vienna, 1090 Vienna, Austria — 3Max Planck Institute for Polymer Research, 55128 Mainz, Germany — 4Aalto University, Finland and Kanazawa University, Kanazawa 920-1192, Japan
Feldspar minerals are highly abundant in the Earth's crust. They play a significant role in a plethora of geochemical processes, including, e.g., weathering and ice nucleation. For many of these processes, the interaction of water with the feldspar surface is decisive. However, little is known about binding and desorption of the first water layer on feldspar. Here, we present temperature-programmed desorption (TPD) experiments of water desorbing from the thermodynamically most stable cleavage plane of potassium-rich feldspar, microcline (001). From the interplay of these experimental data with density-functional theory (DFT) results we shed light onto the binding of the first water layer. Our work confirms previous theory results from literature and provides molecular-scale insights into the binding of water onto microcline (001).
Keywords: microcline; temperature-programmed desorption; water; ice nucleation