Hashimoto, Masaaki

写真a

Affiliation

Faculty of Science and Technology, Department of System Design Engineering （Yagami）

Position

Assistant Professor (Non-tenured)/Research Associate (Non-tenured)/Instructor (Non-tenured)
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Career 【 Display / hide 】

  • 2021.04
    -
    2022.03

    名古屋大学大学院, 工学研究科, 日本学術振興会特別研究員 (PD)

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Papers 【 Display / hide 】

  • Design and Fabrication of a Micropillar-Pumped Polymer Loop Heat Pipe

    Masaaki Hashimoto, Taiga Kawakami, Abdulkareem Alasli, Ryobu Nomura, Hosei Nagano, Ai Ueno

    Journal of Microelectromechanical Systems （Institute of Electrical and Electronics Engineers (IEEE))     1 - 3 2023.10

    Lead author, Accepted,  ISSN  1057-7157

    　View Summary

    This letter presents a micropillar-pumped polymer loop heat pipe (LHP) with potential applications in flexible electronics. A unique evaporator with a micro pillar wick was designed for a flexible polymer LHP. The polymer LHP was fabricated via simple and cost-effective soft lithography, omitting the need for a porous wick. This design and fabrication approach facilitated passive two-phase cooling in the polymer LHP, with up to 34 <inline-formula> <tex-math notation="LaTeX">$^{\circ}$</tex-math> </inline-formula>C reduction in evaporator temperature when compared to a non-fluid-charged state in a horizontal orientation. 2023-0140

  • Additive manufacturing method of electrothermal 4D bimorph microactuator

    Masaaki Hashimoto, Takaya Sato, Yoshihiro Taguchi

    Sensors and Actuators A: Physical （Elsevier BV)  356   114348 - 114348 2023.06

    Lead author, Accepted,  ISSN  0924-4247

    　View Summary

    This paper presents an additive manufacturing method of an electrothermally controllable 4D-printed bimorph microactuator. We fabricated an electrothermal 4D bimorph microactuator equipped with an electrical heater through a two-step additive process: two-photon polymerization (TPP) 4D printing and liquid metal microfluidic injection. First, a 3D thermal bimorph microstructure including a microchannel was built using TPP printing. Second, the printed microstructure was electrically wired by injecting a liquid metal into the microchannel. To validate this method, we fabricated and characterized a vertical-spiral-shaped electrothermal 4D rotary microactuator with a large angular displacement. The fabricated electrothermal microactuator successfully controlled its temperature and angular displacement via electricity. Furthermore, we experimentally demonstrated the unique ability of the electrothermal 4D bimorph microactuator to produce repeatable large angular displacements of more than 10° at 386 mV. Accordingly, the proposed method is expected to enhance the spatial design freedom of electrothermal microactuators with potential applications in soft microrobotics.

  • Circular pyramidal kirigami microscanner with millimeter-range low-power lens drive

    Masaaki Hashimoto

    Optics Express （The Optical Society)  28 （ 12 ） 17457 - 17457 2020.06

    Lead author, Accepted,  ISSN  1094-4087

  • Development of a Robust Autofluorescence Lifetime Sensing Method for Use in an Endoscopic Application

    Shuntaro Ito, Masaaki Hashimoto, Yoshihiro Taguchi

    Sensors  2020.03

    Accepted,  ISSN  1424-8220

    　View Summary

    <jats:p>Endoscopic autofluorescence lifetime imaging is a promising technique for making quantitative and non-invasive diagnoses of abnormal tissue. However, motion artifacts caused by vibration in the direction perpendicular to the tissue surface in a body makes clinical diagnosis difficult. Thus, this paper proposes a robust autofluorescence lifetime sensing technique with a lens tracking system based on a laser beam spot analysis. Our optical setup can be easily mounted on the head of an endoscope. The variation in distance between the optical system and the target surface is tracked by the change in the spot size of the laser beam captured by the camera, and the lens actuator is feedback-controlled to suppress motion artifacts. The experimental results show that, when using a lens tracking system, the standard deviation of fluorescence lifetime is dramatically reduced. Furthermore, the validity of the proposed method is experimentally confirmed by using a bio-mimicking phantom that replicates the shape, optical parameters, and chemical component distribution of the cancerous tissue.</jats:p>

  • Design and Fabrication of a Kirigami-Inspired Electrothermal MEMS Scanner with Large Displacement

    Masaaki Hashimoto, Yoshihiro Taguchi

    Micromachines  2020.03

    Lead author, Accepted

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • Additive and subtractive manufacturing of multi-DOF thermally-driven 4D soft microactuator

    2023.04
    -
    2025.03

    若手研究, Principal investigator

  • TBD

    2022.04
    -
    2025.03

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), No Setting

  • Low-temperature-driven phase change microactuator for mechanothermology

    2021.04
    -
    2022.03

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows, Grant-in-Aid for JSPS Fellows, No Setting

  • Development of ultra-long-stroke electrothermal MEMS actuator with low power consumption

    2021
    -
    2023

    JST科学技術振興機構, 戦略的創造研究推進事業 ACT-X, No Setting

    　View Summary

    膨大な熱エネルギーを消費してきた社会がカーボンニュートラル社会へとシフトするためには、高効率に熱エネルギーを機械エネルギー変換するハードウェアが不可欠です。本研究では、相変化ナノ薄膜と熱膨張ナノ薄膜を融合させた低消費電力で超長ストロークな熱駆動MEMSアクチュエーターを開発し、熱エネルギーを超高効率に機械エネルギーに変換する強靭化マイクロマシンの設計・製造基盤技術の創出に挑戦します。

  • 内視鏡下血流イメージングによる定量的光バイオプシー技術の創出

    2019.04
    -
    2020.03

    慶應義塾大学, 慶應義塾大学博士課程学生研究支援プログラム（研究科推薦枠）, Principal investigator

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Intellectual Property Rights, etc. 【 Display / hide 】

  • 流量測定装置、流量測定方法および流量測定プログラム

    Date applied： 特願2017-242118  2017.12 

    Date announced： 特開2018-100968   

    Patent

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Awards 【 Display / hide 】

  • 日本熱物性学会奨励賞

    2023.10, 日本熱物性学会

  • 若手優秀講演表彰

    2022.02, 一般社団法人日本機械学会マイクロ・ナノ工学部門

  • 日本熱物性学会論文賞

    橋本将明,田口良広, 2021.10, 日本熱物性学会, ミリ長ストローク・低電力熱駆動切り紙MEMSアクチュエータの開発ー薄膜バイモルフの熱・機械応答特性ー

  • 日本伝熱学会奨励賞

    2021.05, 社団法人日本伝熱学会, 光バイオプシーのためのミリ長ストローク切り紙型熱駆動MEMSスキャナーの開発

  • 優秀研究活動賞 (博士)

    2021.03, 慶應義塾大学理工学研究科

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Courses Taught 【 Display / hide 】

  • LABORATORIES IN SYSTEM DESIGN ENGINEERING 1)

    2024

  • LABORATORIES IN SCIENCE AND TECHNOLOGY

    2024

  • COMPUTER PROGRAMMING EXERCISE

    2024

  • LABORATORIES IN SYSTEM DESIGN ENGINEERING 1)

    2023

  • LABORATORIES IN SCIENCE AND TECHNOLOGY

    2023

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