Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Scanning Probe Microscopy: Light-Matter Interactions at the Atomic Scale II
O 43.1: Vortrag
Dienstag, 18. März 2025, 14:00–14:15, H24
Kinetics of nucleation and crystallization of sodium chloride based on frozen solution sample preparation apparatus — •Xinmeng Liu1, Jiadong Guo1, Yunzhe Jia2, Sheng Meng2, Enge Wang1, and Ying Jiang1 — 1International Center for Quantum Materials, School of Physics, Peking University, Beijing, People's Republic of China — 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, People's Republic of China
Solution environment is ubiquitous and plays a vital role in various fields, especially in the nucleation and crystallization process. Here, we designed and built a new frozen solution sample preparation apparatus compatible with UHV environment, allowing atomic-scale SPM experiments. By utilization of this apparatus, we successfully transferred NaCl solution in glassy states onto the Au(111) substrate. The qPlus-based AFM with CO tip characterized the kinetics of ions nucleation and crystallization after annealing. We found that the ions tend to form disordered networks with water molecules at the initial stage of nucleation, and then adjust to ordered crystals. Furthermore, ions continue to crystallize on the formed island surface by way of chain growth. This is different from the previous view that NaCl nucleation follows the classical nucleation theory. In addition, we also captured the existence of a small crystal nucleus composed of several ions, which is surrounded by water molecules that help the nucleus to further grow. Our results provide new insights into solution process and will have significant effect on the mechanism of material synthesis.
Keywords: nucleation; crystallization; qPlus-AFM; solution