Ding Yuanqi, Wang Xinyi, Li Donglin, Xie Lei, Xu Wei
Interdisciplinary Materials Research Center, College of Materials Science and Engineering , Tongji University , Shanghai 201804 , People's Republic of China.
ACS Nano. 2019 May 28;13(5):6025-6032. doi: 10.1021/acsnano.9b02259. Epub 2019 May 7.
Salt dissolution is generally encountered in widespread phenomena in nature. As a typical case, the dissolution of NaCl has been widely investigated in aqueous environment, while the process and mechanism of the on-surface dissolution may differ from that in solution and remain to be explored. Herein, we model a NaCl dissolution process on the Au(111) surface with confined water at room temperature (RT) and above. With the assistance of adenine molecules as water reservoir and carrier, the dissolution of NaCl is achieved above RT via the Langmuir-Hinshelwood mechanism rather than the Eley-Rideal one, along with the selective formation of stable Cl hydrates, which desorb from the surface in the next step. To explore the generality, such a strategy has been extended to other sodium halide systems ( e. g., NaBr and NaI), and expectedly, the dissolution of sodium halides is also achieved by forming stable Br and I hydrates via the Langmuir-Hinshelwood process.
