成核
结晶
化学物理
纳米晶
材料科学
分子动力学
Crystal(编程语言)
纳米技术
化学
热力学
物理
计算化学
计算机科学
程序设计语言
作者
Sungho Jeon,Taeyeong Heo,Sang Yeon Hwang,Jim Ciston,Karen C. Bustillo,Bryan W. Reed,Jimin Ham,Sungsu Kang,Sungin Kim,Joowon Lim,Ki-Taek Lim,Ji Soo Kim,Min Ho Kang,Ruth S. Bloom,Sukjoon Hong,Kwanpyo Kim,Alex Zettl,Woo Youn Kim,Peter Ercius,Jung Won Park,Won Chul Lee
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2021-01-29
卷期号:371 (6528): 498-503
被引量:96
标识
DOI:10.1126/science.aaz7555
摘要
Nucleation in atomic crystallization remains poorly understood, despite advances in classical nucleation theory. The nucleation process has been described to involve a nonclassical mechanism that includes a spontaneous transition from disordered to crystalline states, but a detailed understanding of dynamics requires further investigation. In situ electron microscopy of heterogeneous nucleation of individual gold nanocrystals with millisecond temporal resolution shows that the early stage of atomic crystallization proceeds through dynamic structural fluctuations between disordered and crystalline states, rather than through a single irreversible transition. Our experimental and theoretical analyses support the idea that structural fluctuations originate from size-dependent thermodynamic stability of the two states in atomic clusters. These findings, based on dynamics in a real atomic system, reshape and improve our understanding of nucleation mechanisms in atomic crystallization.
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