Faculty Profiles - SAKAMOTO Kenji

Papers - SAKAMOTO Kenji

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Evaluation of engine oil degradation based on viscosity and transmitted light intensity measurements Reviewed

Sakamoto K., Mizutani F., Shimomura M., Yama K., Matsunaga T., Lee S.S.

Sensors and Actuators A: Physical 361 2023.10

Prototype Paper-Based Microfluidic Chip for Electrical Resistivity Measurement Reviewed

Sakamoto Kenji, Hachiya Yuriko, Kobayashi Koichiro, Yoshitama Kazuo

IEEJ Transactions on Sensors and Micromachines ( The Institute of Electrical Engineers of Japan ) 143 ( 9 ) 269 - 273 2023.09

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

In this study, a prototype paper-based microfluidic chip for electrical resistivity measurement was fabricated. Microelectrodes and microfluidic channels were formed on filter paper media to evaluate the electrical resistivity of NaCl samples in flow. Three different concentrations of NaCl samples were evaluated and found to be capable of relative evaluation.

DOI： 10.1541/ieejsmas.143.269

CiNii Research

Flow length-dependent evaluation of separation and concentration functions of microfluidic chips for allergy testing using pseudo-cells Reviewed

Shinuchi S., Kobayashi K., Yanase Y., Sakamoto K.

Japanese Journal of Applied Physics 62 ( SG ) 2023.06

Evaluation of Electrical Conductivity of Plasma-Simulated Samples Using Microfluidic Chips Reviewed

Sakamoto Kenji, Hachiya Yuriko, Kobayashi Koichiro

IEEJ Transactions on Sensors and Micromachines ( The Institute of Electrical Engineers of Japan ) 143 ( 6 ) 132 - 136 2023.06

Authorship：Lead author,　Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)

In this study, the electrical conductivity of a small sample of simulated plasma was measured by a microfluidic chip with electrodes. Saline samples of different concentrations were evaluated based on saline (0.9 w/v% NaCl solution). The electrical conductivity of samples of saline with albumin was also measured. In order to investigate whether the differences in conductivity were due to viscosity following Walden’s law, we correlated the electrical conductivity with the viscosity evaluated by the capillary method.

DOI： 10.1541/ieejsmas.143.132

Scopus

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85164983917&origin=inward

研究室だより：九州工業大学大学院情報工学研究院知的システム工学研究系坂本研究室

坂本憲児

電気学会論文誌Ｅ（センサ・マイクロマシン部門誌） ( 一般社団法人電気学会 ) 143 ( 4 ) NL4_2 - NL4_2 2023.04

矩形型マイクロ流路内流動における解析解の比較

古川雄登, 坂本憲児, 小林孝一朗

第70回応用物理学会春季学術講演会紀要 2023.03

多段階のエッチングを用いた複合形状の微小柱状構造アレイの作製

角田大成, 岩崎正裕, 村上直, 坂本憲児, 伊藤高廣

2023年度精密工学会春季大会学術講演会紀要 2023.03

多段階のエッチングを用いた複合形状の微小柱状構造アレイの作製

角田大成, 岩崎正裕, 村上直, 坂本憲児, 伊藤高廣

精密工学会学術講演会講演論文集 ( 公益社団法人精密工学会 ) 2023S ( 0 ) 642 - 643 2023.03

Language：Japanese Publishing type：Research paper (scientific journal)

基材表面への微細加工の手法として、エッチング加工が挙げられる。特にシリコンの深掘りエッチング(DRIE)は、シリコン基材の表面に微小な3次元構造体を加工・構築するために重要な技術であり、樹脂成形のための鋳型構造の作製にも適用可能である。本研究では、DRIEを含む多段階のエッチング加工を用いて、シリコン基材表面に複合形状の微小柱状構造アレイを作製した結果を報告する。

DOI： 10.11522/pscjspe.2023s.0_642

CiNii Research

Electrical conductivity measurement using a microfluidic chip and evaluation of vsiscosity by Walden's rule Reviewed

Sakamoto K., Hachiya Y., Kobayashi K.

Electronics and Communications in Japan 106 ( 2 ) 2023.01

マイクロ流体チップによる血漿模擬サンプルの電気伝導率評価

坂本憲児, 八谷百合子, 小林孝一朗

第39回「センサ・マイクロマシンと応用システム」シンポジウム紀要 2022.11

Degradation Evaluation by Viscosity Measurement of Low Volume Oil Samples Reviewed

Kenji Sakamoto, Fumikazu Mizutani, Michio Shimomura, Tatsuya Fujita and Sang-Seok Lee

JCK MEMS/NEMS 2022 Conference Proceedings 2022.10

Electrical Conductivity Measurement using a Microfluidic Chip and Evaluation of Viscosity by Walden's Rule Reviewed

Sakamoto Kenji, Hachiya Yuriko, Kobayashi Koichiro

IEEJ Transactions on Sensors and Micromachines ( The Institute of Electrical Engineers of Japan ) 142 ( 10 ) 254 - 258 2022.10

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

In this study, the electrical conductivity of low-volume samples was measured using a prototype microfluidic chip with electrodes. We were able to show the difference of electrical conductivity in the samples of saline solution (0.9w/v% NaCl solution) with sucrose. The correlation between the electrical conductivity and the viscosity evaluated by the capillary method was shown. This correlation was shown that it is possible to evaluate viscosity based on the Walden's rule with our chip.

DOI： 10.1541/ieejsmas.142.254

Scopus

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85144634113&origin=inward

Relative viscosity evaluation of low-volume samples using capillary flow under differential pressure Reviewed

Sakamoto K., Okazaki N., Makino K., Osawa Y., Sanari N., Hachiya Y., Ohno K.

Japanese Journal of Applied Physics 61 ( 6 ) 2022.06

マイクロ流体チップを用いた電気伝導率測定および Walden 法則を用いた粘度評価

坂本憲児, 八谷百合子, 小林孝一朗

第38回「センサ・マイクロマシンと応用システム」シンポジウム紀要 2021.11

Cell Separation and Concentration Microfluidic Chip for Allergy Diagnosis Reviewed

Shunsuke Shinuchi, Koichiro Kobayashi, Yuhki Yanase and Kenji Sakamoto 1

Proceedings of 34th International Microprocesses and Nanotechnology Conference 2021.10

生活習慣病予防のための体液粘度測定装置 Invited

坂本憲児、大野宏毅

月刊バイオインダストリー, 第37巻、第11号　2020年 ( シーエムシー出版 ) 37 ( 11 ) 2020.11

Evaluation of viscosity and surface tension of low-volume samples using glass capillary Reviewed

Sakamoto K., Kobayashi K., Tabira K., Hachiya Y., Ohno K.

Japanese Journal of Applied Physics 59 ( 10 ) 2020.10

Evaluation of body fluid viscosity using glass capillary

Sakamoto Kenji, Tabira Keito, Okada Ryo, Hachiya Yuriko, Ohno Koki

JSAP Annual Meetings Extended Abstracts ( The Japan Society of Applied Physics ) 2020.1 ( 0 ) 2556 - 2556 2020.02

Evaluation of Electron-emitting Film for Spacecraft Charging Mitigation (ELFs Charm)

TANAKA Atomu, MATEO VELEZ Jean-Charles, DADOUCH Sarah, OKUMURA Teppei, SAKAMOTO Kenji, IWATA Minoru, TOYODA Kazuhiro, CHO Mengu

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN ( THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES ) 17 ( 1 ) 1 - 6 2019.01

Language：English Publishing type：Research paper (scientific journal)

To protect a satellite from accidents due to spacecraft charging, Kyushu Institute of Technology (Kyutech) is developing a device called ELFs-Charm, which stands for ELectron-emitting Film for Spacecraft CHARging Mitigation. Electron emission from ELFs-Charm was already confirmed in Polar Earth Orbit in 2012 via flight experiment onboard HORYU-II. As a next step, we are considering the practical operation for spacecraft charging mitigation. The present emission level is not enough to increase the satellite potential. We focus our efforts on improving two properties, charging property and the emission threshold. The charging property is measured by how well the differential voltage between the ELFs-charm insulator surface and the satellite chassis increases. The emission threshold is measured by the differential voltage when the electron emission starts. This paper reports the laboratory experimental results to measure the two properties of various samples. The sample made of fluorin resin coating had a good combination of the charging property and the emission threshold that makes it possible to emit electron under realistic ambient electron current density in orbit.

DOI： 10.2322/tastj.17.1

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007542851

Modulation transfer function analysis of silicon X-ray sensor with trench-structured photodiodes Reviewed

Ariyoshi Tetsuya, Iwasa Jumpei, Takane Yuta, Sakamoto Kenji, Baba Akiyoshi, Arima Yutaka

IEICE Electron. Express ( The Institute of Electronics, Information and Communication Engineers ) 15 ( 11 ) 20180177 - 20180177 2018.06

Language：English Publishing type：Research paper (scientific journal)

A silicon X-ray sensor with trench-structured photodiodes was studied and the influence of Compton scattering was estimated. By irradiating the target pixel with X-rays and measuring the signal from adjacent pixels, X-ray scattering and pixel blur of the proposed sensor was determined. An X-ray sensor with a length of 22.6 mm was designed and fabricated, and its modulation transfer function (MTF) was obtained. A sensor structure to improve the MTF level to that of CdTe was proposed.

DOI： 10.1587/elex.15.20180177

Scopus

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007395665

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Papers - SAKAMOTO Kenji