List of Papers (since 2011, all papers are written in English)

• 2025

  • 22

    Pyrolyzed Iron–Cobalt/Polypyrrole/Reduced Graphene Oxide as an Effective Cathode Electrocatalyst for Oxygen Reduction Reaction in an Alkaline Medium

    H. G. G. Necesito, J. L. Garcia, E. S. Dzmarado, T. Miyao, J. Inukai, and B. J. V. Tongol
    J. Phys. Chem. Solids, 199, 112556 (2025).
    https://doi.org/10.1016/j.jpcs.2025.112556

    21

    Sodiation of Enhanced Green Fluorescent Protein (EGFP) in Basic Solution Studied by Electrospray Mass Spectrometry

    K. Hiraoka, S. Ninomiya, S. Rankin-Turner, N. Suzuki, and S. Akashi
    J. Mass Spectrom., 60, e5111 (2025).
    https://doi.org/10.1002/jms.5111

    20

    Template-Free Modulation of MOF-Derived Atomically Dispersed Fe-N-C Catalyst for Enhanced Oxygen Reduction Reaction and Durability in Acidic Medium

    S. Y. Tan, W. K. Ng, K. S. Loh, N. H. A. Junaidi, J. Inukai, N. U. Saidin, Y. Aun, and W. Y. Wong
    Surf. Interfaces, 56, 105683 (2025).
    https://doi.org/10.1016/j.surfin.2024.105683

    19

    How Do Cocaine and Morphine in Methanol Solution Desorb at the Last Moment of Leidenfrost Phenomenon-Assisted Thermal Desorption?

    K. Hiraoka, S. Rankin-Turner, D. T. Usmanov, S. M. Akhmedov, and S. Ninomiya
    Rapid Commun. Mass Spectrom., 39, e9933 (2025).
    https://doi.org/10.1002/rcm.9933

  2024

  • 18

    Pulsed Nano-electrospray Ionization Applied to Solutions of Angiotensin II, Bradykinin, and Gramicidin S in Water/Acetonitrile (1/1) with the Addition of 1% Acetic Acid and 10 mM Ammonium Acetate

    K. Hiraoka, D. T. Usmanov, S. Ninomiya, S. Rankin-Turner, and S. Akashi
    Mass Spectrometry, 13, A0157 (2024).
    https://doi.org/10.5702/massspectrometry.A0157

    17

    What is the Advantage of Alternative Current (AC) Corona Discharge for APCI Mass Spectrometry?

    K. Hiraoka, H. Shimada, K. Kinoshita, S. Rankin-Turner, and S. Ninomiya
    Int. J. Mass Spectrom., 504, 117299 (2024).
    https://doi.org/10.1016/j.ijms.2024.117299

    16

    Solvent Effect on the Detection of Peptides and Proteins by Nanoelectrospray Ionization Mass Spectrometry: Anomalous Behavior of Aqueous 2-Propanol

    S. Ninomiya, S. Rankin-Turner, S. Akashi, and K. Hiraoka
    Anal. Biochem., 688, 115461 (2024).
    https://doi.org/10.1016/j.ab.2024.115461

    15

    Automated Sample Preparation for Electrospray Ionization Mass Spectrometry Based on CLOCK-Controlled Autonomous Centrifugal Microfluidics

    M. Futami, H. Naito, S. Ninomiya, L.C. Chen, T. Iwano, K. Yoshimura, and Y. Ukita
    Biomedical Microdevices, 26, 22_1-9 (2024).
    https://doi.org/10.1007/s10544-024-00703-4

    14

    Sodiation of Melittin, Cytochrome c, and Ubiquitin Studied by Electrospray Mass Spectrometry: Stabilities of α-helix and β-sheet in Basic Solutions

    K. Hiraoka, S. Ninomiya, S. Rankin-Turner, and S. Akashi
    Int. J. Mass Spectrom., 498, 117212 (2024).
    https://doi.org/10.1016/j.ijms.2024.117212

    13

    Coherent Anti-Stokes Raman Scattering Spectroscopy System for Observation of Water Molecules in Anion Exchange Membrane

    S. W. Wakolo, A. Syouji, M. Sakai, H. Nishiyama, and J. Inukai
    Spectrochim. Acta A Mol. Biomol. Spectrosc., 309, 123875 (2024).
    https://doi.org/10.1016/j.saa.2024.123875

    12

    Various States of Water Species in an Anion Exchange Membrane Characterized by Raman Spectroscopy under Controlled Temperature and Humidity

    S. W. Wakolo, D. A. Tryk, H. Nishiyama, K. Miyatake, A. Iiyama and J. Inukai
    Phys. Chem. Chem. Phys., 26, 1658-1670 (2024).
    https://doi.org/10.1039/d3cp03660j

    11

    Transient Distribution of Water in an Anion Exchange Membrane Fuel Cell Monitored by Operando Coherent Anti-Stokes Raman Scattering Spectroscopy

    S. W. Wakolo, K. Miyatake, and J. Inukai
    Electrochemistry, 92, 017005 (2024).
    https://doi.org/10.5796/electrochemistry.23-00140

  2023

  • 10

    In-situ Observation of an Anion Exchange Membrane at Various Humidity by X-ray Scattering

    K. Yoshida, T. Nagai, K. Ohara, Y. Shirase, K, Miyatake, and J. Inukai
    J. Mol. Liq., 391, 123197 (2023).
    https://doi.org/10.1016/j.molliq.2023.123197

    9

    Analysis of Performance Stability under Conditions of High & Low Humidity of Polymer Electrolyte Fuel Cells with Interdigitated Gas Flow Channels Formed on a Gas Diffusion Layer: An X-ray Imaging and Modeling Study

    T. Inoue, D. Sakai, N. Hirayama, M. Nasu, T. Suzuki, S. Tsushima, J. Inukai, D. A. Tryk, M. Watanabe, A. Iiyama, and M. Uchida
    J. Power Sources, 585, 233623 (2023).
    https://doi.org/10.1016/j.jpowsour.2023.233623

    8

    Site-Specific Deprotonation/Sodiation of Gramicidin S Studied by Electrospray Ionization/Mass Spectrometry

    K. Hiraoka, S. Akashi, S. Rankin-Turner, and S. Ninomiya
    Int. J. Mass Spectrom., 493, 117135 (2023).
    https://doi.org/10.1016/j.ijms.2023.117135

    7

    Analysis of Human Skin Sebum and Animal Meats by Heat Pulse Desorption/ Mass Spectrometry Using Proximity Corona Discharge Ionization

    K. Hiraoka, H. Shimada, K. Kinoshita, S. Rankin-Turner, and S. Ninomiya
    Analytical Biochemistry, 676, 115249 (2023).
    https://doi.org/10.1016/j.ab.2023.115249

    6

    Site-Specific Sodiation of Peptides Studied by Pulsed Nanoelectrospray Ionization

    K. Hiraoka, D. T. Usmanov, S. Ninomiya, S. Rankin-Turner, and S. Akashi
    Int. J. Mass Spectrom., 490, 117073 (2023).
    https://doi.org/10.1016/j.ijms.2023.117073

    5

    Operando Monitoring of Oxygen Drop in Catalyst Layers Accompanied by a Water Increase in Running Proton Exchange Membrane Fuel Cells

    H. Nishiyama and J. Inukai
    ACS Omega, 8, 15318-15322 (2023).
    https://doi.org/10.1021/acsomega.3c00461

    4

    Sputtering Produced by Vacuum Electrospray Droplet Ions with Different Sizes and Charges

    S. Ninomiya, L.C. Chen, and K. Hiraoka
    J. Vac. Sci. Technol. B, 41, 032807_1-7 (2023).
    https://doi.org/10.1116/6.0002529

    3

    Electrospray Droplet Impact/Secondary Ion Mass Spectrometry (EDI/SIMS) Applied to the Analysis of Explosives

    K. Hiraoka, R. Takaishi, S. Ninomiya, and S. Rankin-Turner
    Int. J. Mass Spectrom., 484, 116993 (2023).
    https://doi.org/10.1016/j.ijms.2022.116993

    2

    An Investigation of the Non-selective Etching of Synthetic Polymers by Electrospray Droplet Impact/Secondary Ion Mass Spectrometry (EDI/SIMS)

    K. Hiraoka, Y. Sakai, H. Kubota, S. Ninomiya, and S. Rankin-Turner
    Mass Spectrom., 12, A0114_1-6 (2023).
    https://doi.org/10.5702/massspectrometry.A0114

  2022

  • 1

    Fundamental Aspects of Droplet Ions Investigated by Vacuum Electrospray Droplet Ion Induced Sputtering

    S. Ninomiya, M. Kawase, S. Tsuneki, L. C. Chen, and K. Hiraoka
    J. Surf. Anal., 29, 90-96 (2022).
    https://doi.org/10.1384/jsa.29.90