Einaga, Yasuaki

写真a

Affiliation

Faculty of Science and Technology, Department of Chemistry (Yagami)

Position

Professor

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Career 【 Display / hide

  • 1997.04
    -
    1998.03

    理化学研究所 ,ジュニアリサーチアソシエイト

  • 1998.04
    -
    1999.11

    日本学術振興会 ,特別研究員

  • 1999.11
    -
    2001.03

    東京大学 ,助手

  • 2001.04
    -
    2003.03

    慶應義塾大学理工学部化学科, 専任講師

  • 2003.04
    -
    2011.03

    慶應義塾大学理工学部化学科, 助教授/准教授

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Academic Background 【 Display / hide

  • 1994.03

    The University of Tokyo, Faculty of Science

    University, Graduated

  • 1996.03

    The University of Tokyo, Graduate School, Division of Science, 化学専攻

    Graduate School, Completed, Master's course

  • 1999.03

    The University of Tokyo, Graduate School, Division of Science, 応用化学専攻

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • 博士(工学), The University of Tokyo, 1999.03

 

Research Areas 【 Display / hide

  • Functional solid state chemistry (Functional Material Chemistry)

 

Papers 【 Display / hide

  • Fabrication and electrochemical properties of boron-doped SiC

    Uchiyama K., Yamamoto T., Einaga Y.

    Carbon (Carbon)  174   240 - 247 2021.04

    ISSN  00086223

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    Silicon carbide (SiC) has excellent properties such as chemical and physical stability, biocompatibility, and high thermal conductivity. However, electrical conductivity of SiC is not high enough for electrochemical applications, which has been a major challenge. Here, in order to improve the conductivity, we prepared boron-doped SiC (SiC:B) and evaluated the electrochemical properties. SiC and SiC:B were fabricated by a microwave plasma chemical vapor deposition method. Structural characterization revealed that the main phase of SiC:B is 3C–SiC where the concentration of doped boron could be controlled by tuning the growth conditions. Electrochemical properties were evaluated by cyclic voltammetry measurements, indicating that the reactivity and sensitivity of the SiC:B electrode was comparable of that of the glassy carbon electrode.

  • Annealing enhancement in stability and performance of copper modified boron-doped diamond (Cu-BDD) electrode for electrochemical nitrate reduction

    Kuang P., Natsui K., Einaga Y., Feng C., Cui Y., Zhang W., Deng Y.

    Diamond and Related Materials (Diamond and Related Materials)  114 2021.04

    ISSN  09259635

     View Summary

    Nitrate contamination in groundwater requires efficient remediation to prevent adverse environmental impacts. This study illustrates the improvement in nitrate reduction process using copper modified BDD (Cu-BDD) with higher stability after annealing treatment. The highest values for nitrate reduction and the selectivity of nitrogen gas were about 71% and 45%, respectively, which were obtained using annealed Cu-BDD electrode. Annealing process promoted the homogeneity of copper oxides that consolidated the electrodeposited copper oxides on the surface of Cu-BDD to enhance the stability of electrode. Meanwhile, annealed Cu-BDD exhibited higher conductivity to facilitate nitrate reduction initiating at a more positive potential. Furthermore, cuprous ions and metallic Cu were formed during the annealing treatment, and had active chemical reaction with nitrate and excellent catalytic capability for the reaction, which efficiently enhanced either the nitrate reduction efficiency or the selectivity of nitrogen gas. The findings advance the current understanding on the enhancement of electrochemical stability and nitrate reduction performance using Cu-BDD after the annealing treatment, and also offer a promising technology for remediation of nitrate-contaminated groundwater.

  • Nickel hydroxide nanoparticles for application in immunochromatographic strip tests of melamine

    Saepudin E., Yuliani T., Musyarofah N.R.R., Nasution M.A.F., Gunlazuardi J., Einaga Y., Ivandini T.A.

    Sensors and Materials (Sensors and Materials)  33 ( 3-2 ) 1027 - 1036 2021.03

    ISSN  09144935

     View Summary

    Nickel hydroxide nanoparticles [Ni(OH)2-NPs] synthesized by a complexation-precipitation method under hydrothermal conditions were employed as a probe in immunochromatographic strip tests for the selective detection of melamine. The characterization of Ni(OH) -NPs and their conjugation to anti-melamine antibody (anti-MEL) were performed using a UV- visible spectrophotometer, Fourier transform infrared (FTIR) spectroscopy, and TEM. On the basis of the green line intensity, the strip test can selectively detect melamine at a minimum concentration of 25 ppm. Our results suggest that this system is promising for the quantitative detection of melamine. 2

  • Nanodiamonds Inhibit Cancer Cell Migration by Strengthening Cell Adhesion: Implications for Cancer Treatment

    Guo Q., Li L., Gao G., Liu R., Einaga Y., Zhi J.

    ACS Applied Materials and Interfaces (ACS Applied Materials and Interfaces)  13 ( 8 ) 9620 - 9629 2021.03

    ISSN  19448244

     View Summary

    Nanodiamonds (NDs) are a type of biocompatible nanomaterial with easily modified surfaces and are considered as promising candidates in biomedicine. In this work, the inhibition of tumor cell migration by carboxylated nanodiamonds (cNDs) was investigated. AFM-based single cell adhesion and F-actin staining experiments demonstrated that cNDs treatment could enhance cell adhesion and impair assembly of the cytoskeleton. The mechanism analysis of the regulatory protein expression level also proved that cNDs could inhibit the migration of Hela cells by preventing the epithelial-mesenchymal transition (EMT) process through the transforming growth factor β (TGF-β) signaling pathway. The in vivo pulmonary metastasis model also showed that cNDs effectively reduced the metastasis of murine B16 melanoma cells. In summary, cNDs have been demonstrated to inhibit cancer cell migration in vitro and decrease tumor metastasis in vivo. Therefore, cNDs might have potential utility for specific cancer treatment.

  • Electrogenerated Chemiluminescence of Luminol Mediated by Carbonate Electrochemical Oxidation at a Boron-Doped Diamond

    Irkham , Rais R.R., Ivandini T.A., Fiorani A., Einaga Y.

    Analytical Chemistry (Analytical Chemistry)  93 ( 4 ) 2336 - 2341 2021.02

    ISSN  00032700

     View Summary

    The electrogenerated chemiluminescence of luminol is a process by which light generation is triggered by adding hydrogen peroxide and then applying a suitable electrode potential. Here, we take this phenomenon one step forward by avoiding the addition of hydrogen peroxide using a smart combination of a boron-doped diamond electrode and a carbonate electrolyte to generate the hydrogen peroxide directly in situ. The reaction occurs because of the carbonate electrochemical oxidation to peroxydicarbonate and the following hydrolysis to hydrogen peroxide, which triggers the emission from luminol. The electrogenerated chemiluminescence emission has been optimized by an investigation of the applied potentials, the carbonate concentration, and the pH. Furthermore, these results have been used to shine a light on the reaction mechanisms. Because this method does not require the addition of hydrogen peroxide, it might find application in efforts to avoid instability of hydrogen peroxide or its interference with the analytes of interest.

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Papers, etc., Registered in KOARA 【 Display / hide

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Reviews, Commentaries, etc. 【 Display / hide

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

  • 革新的sp3機能電極材料の創製

    2019.04
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    2022.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 栄長 泰明, Grant-in-Aid for Scientific Research (A) , Principal Investigator

  • 光制御可能な超伝導ナノ微粒子の創製

    2016.04
    -
    2019.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 栄長 泰明, Grant-in-Aid for Scientific Research (B), Principal Investigator

 

Courses Taught 【 Display / hide

  • CHEMISTRY B

    2021

  • CHEMICAL SEPARATION AND ANALYSIS (BASIC INORGANIC AND ANALYTICAL CHEMISTRY 3)

    2021

  • CHEMICAL SEPARATION AND ANALYSIS

    2021

  • BACHELOR'S THESIS

    2021

  • COORDINATION CHEMISTRY (INORGANIC AND ANALYTICAL CHEMISTRY 2)

    2021

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