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https://hdl.handle.net/2115/85109

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

英語

screw dislocation

2022-03-01

National Academy of Sciences.

Proceedings of the National Academy of Sciences of the United States of America (PNAS)

119(10)

e2115955119

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.

学術雑誌論文

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Creative Commons Attribution 4.0 International

0027-8424