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Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy (ULSaN Lab)
Research Interests
  • Femtochemistry/biology, 4D electron microscopy, structural dynamics, materials phenomena

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Observing in space and time the ephemeral nucleation of liquid-to-crystal phase transitions

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Title
Observing in space and time the ephemeral nucleation of liquid-to-crystal phase transitions
Author
Yoo, Byung-KukKwon, Oh-HoonLiu, HaihuaTang, JauZewail, Ahmed H
Issue Date
2015-10
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.6, pp.8639
Abstract
The phase transition of crystalline ordering is a general phenomenon, but its evolution in space and time requires microscopic probes for visualization. Here we report direct imaging of the transformation of amorphous titanium dioxide nanofilm, from the liquid state, passing through the nucleation step and finally to the ordered crystal phase. Single-pulse transient diffraction profiles at different times provide the structural transformation and the specific degree of crystallinity (η) in the evolution process. It is found that the temporal behaviour of η exhibits unique 'two-step' dynamics, with a robust 'plateau' that extends over a microsecond; the rate constants vary by two orders of magnitude. Such behaviour reflects the presence of intermediate structure(s) that are the precursor of the ordered crystal state. Theoretically, we extend the well-known Johnson-Mehl-Avrami-Kolmogorov equation, which describes the isothermal process with a stretched-exponential function, but here over the range of times covering the melt-to-crystal transformation. © 2015 Macmillan Publishers Limited.
URI
https://scholarworks.unist.ac.kr/handle/201301/17742
URL
http://www.nature.com/ncomms/2015/151019/ncomms9639/full/ncomms9639.html
DOI
10.1038/ncomms9639
ISSN
2041-1723
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CHM_Journal Papers
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