Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 143, Issue 4, Pages 1763-1767Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c12100
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Funding
- JSPS KAKENHI [JP19H05459, JP20K15123]
- Japan Science and Technology Agency (SENTAN) [JPMJSN16B1]
- Japanese Society of Microscopy
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Crystallization is the process of forming an organized solid through nucleation and growth of atoms or molecules, which is inherently stochastic. Experimental observation of NaCl nanocrystal nucleation and growth revealed both random fluctuations and controlled crystal formation at different temperatures. The role of graphitic surface and mechanical vibration in the process was experimentally highlighted.
Crystallization is the process of atoms or molecules forming an organized solid via nucleation and growth. Being intrinsically stochastic, the research at an atomistic level has been a huge experimental challenge. We report herein in situ detection of a crystal nucleus forming during nucleation/growth of a NaCl nanocrystal, as video recorded in the interior of a vibrating conical carbon nanotube at 20-40 ms frame(-1) with localization precision of <0.1 nm. We saw NaCl units assembled to form a cluster fluctuating between featureless and semiordered states, which suddenly formed a crystal. Subsequent crystal growth at 298 K and shrinkage at 473 K took place also in a stochastic manner. Productive contributions of the graphitic surface and its mechanical vibration have been experimentally indicated.
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