成核
过饱和度
水溶液
结晶
Crystal(编程语言)
结晶学
化学物理
亚稳态
相(物质)
化学
材料科学
物理化学
计算机科学
有机化学
程序设计语言
作者
Sooheyong Lee,Haeng Sub Wi,Wonhyuk Jo,Yong Chan Cho,Hyun Hwi Lee,Se‐Young Jeong,Yong‐Il Kim,Geun Woo Lee
标识
DOI:10.1073/pnas.1604938113
摘要
Solution studies have proposed that crystal nucleation can take more complex pathways than previously expected in classical nucleation theory, such as formation of prenucleation clusters or densified amorphous/liquid phases. These findings show that it is possible to separate fluctuations in the different order parameters governing crystal nucleation, that is, density and structure. However, a direct observation of the multipathways from aqueous solutions remains a great challenge because heterogeneous nucleation sites, such as container walls, can prevent these paths. Here, we demonstrate the existence of multiple pathways of nucleation in highly supersaturated aqueous KH2PO4 (KDP) solution using the combination of a containerless device (electrostatic levitation), and in situ micro-Raman and synchrotron X-ray scattering. Specifically, we find that, at an unprecedentedly deep level of supersaturation, a high-concentration KDP solution first transforms into a metastable crystal before reaching stability at room temperature. However, a low-concentration solution, with different local structures, directly transforms into the stable crystal phase. These apparent multiple pathways of crystallization depend on the degree of supersaturation.
科研通智能强力驱动
Strongly Powered by AbleSci AI