2022 Fiscal Year Final Research Report
Crystal Growth in Supercritical Fluid
| Project/Area Number |
20K21156
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 30:Applied physics and engineering and related fields
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| Research Institution | Yamaguchi University |
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Principal Investigator |
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| Project Period (FY) |
2020-07-30 – 2023-03-31
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| Keywords | 超臨界流体 / 二酸化炭素 / その場観察 / 結晶成長 / 高分解能光学顕微鏡 |
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| Outline of Final Research Achievements |
We developed the chamber to in-situ observe the supercritical fluid of carbon dioxide. In addition, we added the optics of the differential interference optical microscopy to the confocal microscopy for the observation at the molecular level, and we enabled the high resolution, super long working distance, and high brightness by improving the optics of the optical microscopy. Using the in-situ observation chamber and advanced optical microscopy, we succeeded in observing the surfaces of calcium carbonate single crystals in supercritical fluid of carbon dioxide at molecular-step level. Consequently, we found the existence of the density fluctuation in the supercritical fluid on the micro-meter scale. In contrast, the step structures of calcium carbonates did not change at all. Then, we added powder calcium hydroxide into the supercritical fluid of carbon dioxide, and we revealed that the calcium carbonates grow in the supercritical fluid of carbon dioxide, using calcium hydroxide.
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| Free Research Field |
結晶成長学
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| Academic Significance and Societal Importance of the Research Achievements |
本成果は工場、発電所から排出される二酸化炭素を直接処理可能にするカーボンニュートラルに向けた革新的な技術と期待される。液体二酸化炭素を高圧下の地殻中に保存、鉱物化させる大規模な国家プロジェクトが進んでおり、本成果は国家戦力に本質的に貢献できる。更に、本研究によって世界で初めて超臨界流体中の結晶表面を分子段差レベルでその場観察した点に意義がある。従来、高品質な結晶が得られなかった超臨界流体中での結晶育成プロセスに設計指針をもたらす可能性がある。パワーデバイスや5G基地局のアンテナ材料など産業に有用な結晶を超臨界流体（水）中の大量育成に貢献する。このように本成果は多岐の分野に貢献する。
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