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Step-bunching instability of growing interfaces between ice and supercooled water

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Title: Step-bunching instability of growing interfaces between ice and supercooled water
Authors: Murata, Ken-ichiro Browse this author →KAKEN DB
Sato, Masahide Browse this author
Uwaha, Makio Browse this author
Saito, Fumiaki Browse this author
Nagashima, Ken Browse this author →KAKEN DB
Sazaki, Gen Browse this author →KAKEN DB
Keywords: Step-bunching instability
ice-crystal growth
melt growth
in situ observation
screw dislocation
Issue Date: 1-Mar-2022
Publisher: National Academy of Sciences.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America (PNAS)
Volume: 119
Issue: 10
Start Page: e2115955119
Publisher DOI: 10.1073/pnas.2115955119
Abstract: Ice-crystal growth in supercooled water is one of the most familiar examples of phase-transition dynamics, playing essential roles in various natural phenomena on Earth. Despite its fundamental importance, the microscopic view at the elementary step level remains elusive. Here, using an advanced optical microscope, we find self-organization of elementary steps during ice-crystal growth, called step-bunching instability (SBI), driven by the competition between step dynamics, interfacial stiffness, and latent heat diffusions. We also find that the SBI transiently induces screw dislocations and resulting spiral growth in the late stage of the growth process. Furthermore, quantitative observations with a two-beam interferometer allow us to obtain insights into the relative importance of the various mechanisms of the step-step interactions. Our finding offers a significant clue to understanding the general mechanism of melt growth beyond ice-crystal growth, inseparably involving several broad research fields, including cryobiological, geophysical, and material branches.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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