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Takuma Yagasaki, Masaru Yamasaki, Masakazu Matsumoto, and Hideki Tanaka
Formation of Hot Ice Caused by Carbon Nanobrushes
J. Chem. Phys. 151, 064702 (2019).
カーボンナノチューブでできたナノブラシの間では、水は0度よりもずっと高温まで融けずに氷のままでいられるかもしれない。
従来、水に何か(イオン液体、気体)を混ぜることで融点を制御する試みは多数ありましたが、ナノブラシのような固体の表面を使うことでバルクの氷の融点を制御した例はおそらくないと思います。
また、ナノチューブの中で水が凍る、という研究はたくさんなされてきましたが、外側でも水はけっこう安定になれるという点も新しいです。外側なので、大量の水をとりこむことができ、より実用性が高まります。(蓄熱材料、塩分除去など)
ここで出現したハニカム構造の新しい氷ice dtcについては、他の論文でも詳しく解析しています。MYMT2019 TYM2019
Between carbon nanotube nanobrushes, water may remain ice without melting to much higher than zero degrees.
In the past, there have been many attempts to control the melting point of water by mixing it with something (Ionic liquids and gases). However, there has probably never been a case where the melting point of bulk ice has been controlled by using a solid surface such as a nano-brush.
And while there’s been a lot of research showing that water freezes inside nanotubes, it’s also new that water can be fairly stable outside of the nanotubes. Because it is outside, it can take in a large amount of water, so it is more practical. (Thermal storage materials, salt removal, etc.)
The honeycomb structure of ice dtc has been analyzed in detail in other papers. MYMT2019 TYM2019
paper2019 papers water research surface zeoliticice