| Zdroj: |
Yesibolati, M N, Lagana, S, Sun, H, Beleggia, M, Kathmann, S M, Kasama, T & Mølhave, K 2020, ' Mean Inner Potential of Liquid Water ', Physical Review Letters, vol. 124, no. 6, 065502 . https://doi.org/10.1103/physrevlett.124.065502 |
| Popis: |
Improving our experimental and theoretical knowledge of electric potentials at liquid-solid boundaries is essential to achieve a deeper understanding of the driving forces behind interfacial processes. Electron holography has proved successful in probing solid-solid interfaces but requires knowledge of the materials' mean inner potential (MIP, ${V}_{0}$), which is a fundamental bulk material property. Combining off-axis electron holography with liquid phase transmission electron microscopy (LPTEM), we provide the first quantitative MIP determination of liquid water ${V}_{0}=+4.48\ifmmode\pm\else\textpm\fi{}0.19\text{ }\text{ }\mathrm{V}$. This value is larger than most theoretical predictions, and to explain the disagreement we assess the dominant factors needed in quantum simulations of liquid water. A precise MIP lays the foundations for nanoscale holographic potential measurements in liquids, and provides a benchmark to improve quantum mechanical descriptions of aqueous systems and their interfaces in, e.g., electrochemistry, solvation processes, and spectroscopy. |
