2023-05-30 スイス連邦工科大学ローザンヌ校(EPFL)
◆スイスの研究チームが「無人地帯」と呼ばれる低温範囲で水の特性を調べる方法を開発し、超冷却水の構造や性質についての新たな洞察を得ました。この研究は、水の謎を解くための重要な一歩となりました。
＜関連情報＞
- https://actu.epfl.ch/news/breaking-the-ice-over-a-40-year-problem-of-superco/
- https://www.nature.com/articles/s41467-023-38520-7
無人の地にある深い過冷却水の電子線回折 Electron diffraction of deeply supercooled water in no man’s land
Constantin R. Krüger,Nathan J. Mowry,Gabriele Bongiovanni,Marcel Drabbels & Ulrich J. Lorenz
Nature Communications Published:17 May 2023
DOI:https://doi.org/10.1038/s41467-023-38520-7
Abstract
A generally accepted understanding of the anomalous properties of water will only emerge if it becomes possible to systematically characterize water in the deeply supercooled regime, from where the anomalies appear to emanate. This has largely remained elusive because water crystallizes rapidly between 160 K and 232 K. Here, we present an experimental approach to rapidly prepare deeply supercooled water at a well-defined temperature and probe it with electron diffraction before crystallization occurs. We show that as water is cooled from room temperature to cryogenic temperature, its structure evolves smoothly, approaching that of amorphous ice just below 200 K. Our experiments narrow down the range of possible explanations for the origin of the water anomalies and open up new avenues for studying supercooled water.
