NAKAGAWA Tessui

写真a

Title

Associate Professor

Researcher Number(JSPS Kakenhi)

50647261

Homepage URL

http://www.cc.u-ryukyu.ac.jp/~tessui/HE-Lab/

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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Faculty of Science   Chemistry, Biology and Marine Science   Associate Professor  

  • Concurrently   University of the Ryukyus   Faculty of Engineering   Associate Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Chemistry, Biology and Marine Science   Associate Professor  

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University 【 display / non-display 】

  • 2000.04
    -
    2004.03

    Hiroshima University   Faculty of Science   Physics department   Graduated

  • 2000.04
    -
    2004.03

    Hiroshima University   Faculty of Science   Department of Physical Science   Graduated

  • 2004.04
    -
    2009.03

    Hiroshima University     Graduated

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Graduate School 【 display / non-display 】

  • 2004.04
    -
    2009.03

    Hiroshima University  Graduate School, Division of Integrated Science  Quantum Matter  Doctor's Course  Completed

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Academic degree 【 display / non-display 】

  • Hiroshima University -  Ph.D in material science

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External Career 【 display / non-display 】

  • 2009.04
    　
    　

    Hiroshima university, Institute for Advanced Materials Research, postdoc  

  • 2009.05
    -
    2012.07

    Los Alamos National Laboratory, postdoc  

  • 2012.08
    -
    2012.09

    university of Tsukuba, Graduate School of SIE, Energy Conversion Lab., postdoc  

  • 2012.10
    -
    2023.03

    University of the Ryukyus  

  • 2012.10
    -
    2023.03

    University of the Ryukyus, Faculty of Science, Department of Chemistry, Biology, and Marine Science, Assistant Professor  

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Affiliated academic organizations 【 display / non-display 】

  • 　
    　
    　
     

    THE CHEMICAL SOCIETY OF JAPAN 

  • 　
    　
    　
     

    THE JAPAN SOCIETY OF APPLIED PHYSICS 

  • 2004.04
    -
    Now
     

    Japan Institute of Metals and materials 

  • 2006.09
    -
    2007.09
     

    hydrogen meeting for young researchers    Head of second workshop

  • 2012.11
    -
    2013.11
     

    Japan Society of Coordination Chemistry    Secretary of The 63th Conference

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Research Interests 【 display / non-display 】

  • hydrogen storage materials

  • Ammonia borane

  • Recycle

  • Ammonia

  • Hydrogen storage alloys

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Research Areas 【 display / non-display 】

  • Nanotechnology/Materials / Functional solid state chemistry

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Structural materials and functional materials

  • Nanotechnology/Materials / Inorganic/coordination chemistry

  • Natural Science / Mathematical physics and fundamental theory of condensed matter physics

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Acquisition of a qualification 【 display / non-display 】

  • High School Teacher Specialization License

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Research Theme 【 display / non-display 】

  • Recycle chemistry for Islands

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Thesis 【 display / non-display 】

  • 軽元素を用いた水素貯蔵物質構造変化と反応機構の研究

    2004.03

  • Hydrogen storage properties of Metal-Boron-Hydrogen system

    2009.03

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Published Papers 【 display / non-display 】

  • Delayed ammonia release of ammonia borane hydrolysis by citric acid

    Shimizu Y.

    International Journal of Hydrogen Energy ( International Journal of Hydrogen Energy )  82   733 - 739   2024.09 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • Investigation of Water Quality/Quantity and Effective Utilization of Condensed Water from Dehumidifier in Okinawa as a Model Case

    IZUMI Jin, NAKAGAWA Tessui, ASADA Shoji, YOSHIMOTO Takamitsu, KINOSHITA Koichiro, YONEKURA Isao, KOSHIRO Norihiro, OSHIO Aiko, FUKUMOTO Kozo

    Journal of Japan Society on Water Environment ( Japan Society on Water Environment )  47 ( 1 ) 47 - 53   2024.01 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    <p>In many developing countries with high temperatures and humidity are suffering from a shortage of safe drinking water. In such countries, dehumidifiers are often used to prevent the growth of rust and mold. The water generated from the dehumidifier (DHW) is often discarded because most people feel that this water is dirty. We continuously investigated the water quality and quantity in Okinawa, which is a hot and humid area, for ～1.5 years. As a result, we found that the water from a dehumidifier (average 11.730 mg L<sup>-1</sup>, Main component: TOC 6.985 mg L<sup>-1</sup>, NH<sub>4</sub><sup>+</sup> 3.760 mg L<sup>-1</sup>) contained less impurities than tap water (119.821 mg L<sup>-1</sup>, Main component: Cl<sup>-</sup> 34.315 mg L<sup>-1</sup>, Ca<sup>2+</sup> 28.636 mg L<sup>-1</sup>, Na<sup>+</sup> 25.658 mg L<sup>-1</sup>, SO<sub>4</sub><sup>2-</sup> 23.293 mg L<sup>-1</sup>) throughout the whole year. A compressor-type dehumidifier can generate water of about 62% of rated dehumidification capacity on average annually (6.22 L d<sup>-1</sup>) in a closed room, which is superior to a zeolite-type dehumidifier (3.16 L day<sup>-1</sup>, about 39% of rating on average annually) . These results show that water generated by dehumidifiers can be used for many purposes such as drinking water with a proper water purification treatment.</p>

  • Development of continuous measurement system for hydrogen and impurity gases using detector tube.

    Shimizu Y, Miyagi A, Nakagawa T

    The Review of scientific instruments ( Review of Scientific Instruments )  94 ( 9 ) 095114-1 - 095114-6   2023.09 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    A relatively accurate, inexpensive, simple, and continuous quantification system for hydrogen and impurity gas(es) using a detector tube was developed in this study. Additionally, different detector tubes can be applied to measure different types of gases in a wide range from ppm order to % level. We optimized this system and evaluated its accuracy as well as the behavior of released H2 and impurity (NH3) gases from a hydrolysis of ammonia borane using a Pt/Al2O3 catalyst. The accuracy of hydrogen quantitation achieved by this system was comparable to that of commercial mass flow meters, and the accuracy of ammonia quantitation was 10% or 5% relative standard deviation, which depends on the detector tube. The concentration of released NH3 was evaluated by image analysis with a time-lapse video of the detector tube and succeeded in analyzing from ppm to % order. The H2 and NH3 release behaviors agreed with pH, and the percentage of reaction was estimated by NMR measurement of the reacted solution. These results confirmed the accuracy of this system.

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  • Fundamental Properties of Ammonia Borane Aqueous Solution: Dissolution Enthalpy of Solution, Freezing Points and Solubility Curve, Thermal analysis, Stability and Phase Diagram

    Yoshihiro SHIMIZU, Reiya TAMAKI, Ankit Kumar TRIPATHI, Shuji TAKAMINE, Ye TIAN, Ko KISHIMOTO, Tasuku TERUYA, Yuri UNTEN, Hina SHINJO, Tessui NAKAGAWA

    Journal of the Japan Institute of Energy ( Japan Institute of Energy )  102 ( 7 ) 65 - 76   2023.07 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • Hydrogen carrier by ammonia borane-ammonia system with low-vapor pressure

    Fangqin Guo , Yufeng Wang , Shuji Takamine , Ko Kishimoto , Tomoyuki Ichikawa , Hiroki Miyaoka , Yoshihiro Shimizu , Tessui Nakagawa , Takayuki Ichikawa

    International Journal of Hydrogen Energy ( Elsevier )  102 ( 7 ) 65 - 76   2023.04 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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Other Papers 【 display / non-display 】

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Presentations 【 display / non-display 】

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Industrial Property 【 display / non-display 】

  • Hydrogen production system, fuel cartridge, and ydrogen production system

    Industrial Property No 特願2020-177760  (2020.10.23)

    Patent No 特許6989879  (2021.12.07)

    Tessui Nakagawa, Kazuo Abe, Joji Eguchi, Toru Shirasu

  • Synthesis method of ammonia borane

    Industrial Property No 特願2019-039892  (2019.03.05)

    Unexpectedly No 特開2020-147491  (2020.09.17)

    Patent No 特許7340256  (2023.08.30)

    Nakagawa Tessui

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Academic Awards 【 display / non-display 】

  • GSC research award

    2019.11.17   JST   Milling hydrogenation of MgB2

    Winner: Rin Chinen, Tessui Nakagawa

  • Poster award

    2015.08.28   10th Hydrogen Meeting for Young Researchers   Ammonia storage properties and high purity ammonia emission method of ammine complex

    Winner: Masa-Aki Shiroma, Tessui Nakagawa

  • Professor of th year

    2015.06.25   University of the Ryukyus   Chemistry lab

    Winner: Tessui Nakagawa

  • Professor of th year

    2014.11.04   University of the Ryukyus   Chemistry lab

    Winner: Tessui Nakagawa

  • Poster award

    2014.08.30   9th Hydrogen Meeting for Young Researchers   New ammonia borane synthesis method from h-BN

    Winner: Tessui Nakagawa, Hiroki Uesato, Anthony K. Burrell, Hiroki Miyaoka, Takayuki Ichikawa, Yoshitsugu Kojima

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Grant-in-Aid for Scientific Research 【 display / non-display 】

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2024.04  -  2027.03 

    Direct: 3,600,000 (YEN)  Overheads: 4,680,000 (YEN)  Total: 1,080,000 (YEN)

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2021.04  -  2024.03 

    Direct: 3,200,000 (YEN)  Overheads: 4,160,000 (YEN)  Total: 960,000 (YEN)

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2021.04  -  2024.03 

    Direct: 3,200,000 (YEN)  Overheads: 4,160,000 (YEN)  Total: 960,000 (YEN)

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2021.04  -  2024.03 

    Direct: 3,200,000 (YEN)  Overheads: 4,160,000 (YEN)  Total: 960,000 (YEN)

  • Basic research on regeneration method of metal amidoboranes

    Grant-in-Aid for Scientific Research(C)

    Project Year: 2017.04  -  2020.03 

    Direct: 3,700,000 (YEN)  Overheads: 1,110,000 (YEN)  Total: 4,810,000 (YEN)

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Joint Research activities 【 display / non-display 】

  • In-situ TEM-MS of methanation using hydrogen storage alloys

    Project Year: 2021.04  -  2022.02 

    Member: Nobuko Hanada, Tomohiro Toki, Riki Kobayashi  Offer Organization: Nagoya university

    Direct: 300,000 (YEN)  Overheads: 0 (YEN)  Total: 300,000 (YEN)

  • In-situ TEM-MS of methanation using hydrogen storage alloys

    Project Year: 2020.04  -  2021.02 

    Member: Nobuko Hanada, Tomohiro Toki, Riki Kobayashi  Offer Organization: Nagoya university

    Direct: 300,000 (YEN)  Overheads: 0 (YEN)  Total: 300,000 (YEN)

  • in-situ TEM-MS observation of methanation using hydrogen storage alloys

    Project Year: 2019.04  -  2020.02 

    Member: Nobuko Hanada, Tomohiro Toki, Riki Kobayashi  Offer Organization: Nagoya university

    Direct: 300,000 (YEN)  Overheads: 0 (YEN)  Total: 300,000 (YEN)

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SDGs 【 display / non-display 】

  • 水素エネルギー、リサイクル化学、空調排水の有効利用

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Media Coverage 【 display / non-display 】

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