EGU24-1334, updated on 08 Mar 2024
https://doi.org/10.5194/egusphere-egu24-1334
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Hydration structure on dolomite: Telling calcium and magnesium apart

Angelika Kühnle
Angelika Kühnle
  • Bielefeld, Physical Chemistry, Chemistry, Germany (kuehnle@uni-bielefeld.de)

The hydration structure at the mineral-water interface is decisive for understanding fundamental reactions taking place at mineral surfaces, including mineral dissolution, growth and weathering. Recent advancements in three-dimensional atomic force microscopy (3D AFM) have opened the potential to directly image the hydration structure above a surface, providing unparalleled structural insights into mineral−water interfaces [1].

Here, the hydration structures at the calcite-water [2] and dolomite-water [3] interface will be presented with an emphasis on discussing the differences that arise from the presence of magnesium in dolomite as compared to calcium in calcite. Analysing site-specific vertical positions of hydration layers and comparing them with molecular dynamics simulations unambiguously unravels the minute but decisive difference in ion hydration and provides a clear means for telling calcium and magnesium ions apart.

 

[1]         T. Fukuma, Y. Ueda, S. Yoshioka, H. Asakawa, Phys. Rev. Lett. 2010, 104, 016101

[2]         H. Söngen, M. Nalbach, H. Adam, A. Kühnle, Rev. Sci. Instrum. 2016, 87, 063704

[3]         H. Söngen, C. Marutschke, P. Spijker, E. Holmgren, I. Hermes, R. Bechstein, S. Klassen, J. Tracey, A. S. Foster, A. Kühnle, Langmuir 2017, 33, 125

How to cite: Kühnle, A.: Hydration structure on dolomite: Telling calcium and magnesium apart, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-1334, https://doi.org/10.5194/egusphere-egu24-1334, 2024.