| Project/Area Number |
22K14174
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | Tohoku University |
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Principal Investigator |
劉 思維 東北大学, 流体科学研究所, 助教 (60902228)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2024: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | solvated electrons / plasma flow / homogeneous / time-resolved / solvated electron / plasma / formation / transport |
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| Outline of Research at the Start |
This research innovatively proposes the plasma flow in the liquid as a potential high-effective source for solvated electrons. A real-time two-dimensional visualization using fluid dynamics methods is constructed to evaluate the formation and transport of plasma-induced solvated electrons. The systematic understanding of the coupling influence between solvated electrons and plasma flow will be elucidated. We expect to understand the coupling mechanism and promote the availability of plasma-induced solvated electrons as well as the controllability of plasma flow.
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| Outline of Annual Research Achievements |
1. In FY 2023, the difficulty of transient measurement for charge distribution was overcome. Supplementary to the selection of indicators for solvated electrons(FY 2022), the applicant developed a plasma probe for the solvated electron by the behavior analysis of the plasma flow and the homogeneous low-energy plasma discharge. The results confirm the visualization of solvated electrons using fluid dynamics methods.
2. Time-resolved spectroscopy platform was constructed (FY 2022) and successfully achieved in detecting solvated electrons (FY 2023). The difficulties of synchronization, light intensity modulation, and emission line distinguishing were overcome. The spectral characteristics are also possible to be adopted for monitoring the chemical reactions and species involved in the studied transient phenomena.
3. Based on the previous plasma regulation techniques, the applicant succeeded in forming a pre-designed pathway (electric distortion, UV-VIS focusing, etc.) to change the behavior of plasma flow and enhance the local concentration of solvated electrons at the desired position. The generated solvated electrons have a usable concentration and were successfully adopted in environmental and biomedical fields.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
1. Time-resolved spectroscopy was successfully achieved in FY 2022. In addition, we further analyzed the OES characteristics of the plasma in 2023 and it provided informative knowledge on the chemical species involved. These results are much beyond the original expectation.
2. The difficulty of transient measurement for charge distribution was overcome in FY 2023. The applicant developed a plasma probe for the detection of the solvated electron by the behavior analysis of the plasma flow. It was sufficiently improved compared to the indicators for solvated electrons in FY 2022.
3. The applicant is now able to form a pre-designed pathway to enhance the local concentration of solvated electrons at the desired position and adopt them in environmental and biomedical fields.
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| Strategy for Future Research Activity |
In FY 2024, it is necessary to obtain a comprehensive understanding of the generation and regulation of solvated electrons. Three main works are planned:
1. I succeeded in detecting the chemical species involved in the studied case and I planned to monitor the chemical reactions with the plasma flow and solvated electrons. It is necessary to overcome the difficulty in distinguishing the spectral signals of solvated electrons from the strong emissions of plasma.
2. The interaction of the solvated electrons with the ambient substances should be clarified. I will study this topic in FY 2024 to promote the applications of solvated electrons in environmental and biomedical fields.
3. A conclusive summary of the results and achievements of this project is required and will be performed in FY 2024.
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