Updated on 2024/03/25

写真a

 
Okada Kenji
 
Organization
Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology Associate Professor
School of Engineering Department of Materials Science
Title
Associate Professor
Affiliation
Institute of Engineering

Position

  • Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology 

    Associate Professor  2022.04 - Now

  • School of Engineering Department of Materials Science 

    Associate Professor  2022.04 - Now

Degree

  • 博士(工学) ( Osaka Prefecture University )

Research Areas

  • Nanotechnology/Materials / Nanomaterials

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

  • Nanotechnology/Materials / Organic functional materials

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Research Interests

  • 有機/無機界面

  • Metal-organic framework

  • Oriented films

  • Inorganic materials

  • Porous materials

  • Nanomaterials

Research subject summary

  • 無機材料の表面化学構造を反映した材料合成

  • 金属水酸化物擬単結晶薄膜の形成と機能創出

  • Metal Organic Frameworks (MOFs)配向薄膜の形成と電子/光学デバイスへの応用

Research Career

  • 無機材料の表面化学構造を反映した材料合成

    International Joint Research

    2020.04 - Now 

  • 金属水酸化物擬単結晶薄膜の形成と機能創出

    Joint Research in Organization

    2018 - Now 

  • Metal Organic Frameworks (MOFs)配向薄膜の形成と電子/光学デバイスへの応用

    International Joint Research

    2017 - Now 

Professional Memberships

  • 日本化学会

    2018.03 - Now   Domestic

  • 国際ゾル-ゲル学会(International Sol-Gel Society)

    2011.06 - Now   Overseas

  • 日本ゾル-ゲル学会

    2011.04 - Now   Domestic

  • 日本セラミックス協会

    2011.04 - Now

Committee Memberships (off-campus)

  • 2021度行事企画委員会   日本セラミックス協会  

    2021.04 - Now 

Awards

  • 進歩賞

    2024.03   日本化学会  

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    Country:Japan

  • ”2021 Emerging Investigator”

    2021.09   Journal of Materials Chemistry A  

  • Global Session Best Presentation Award

    2021.03   The 59th Ceramics Basic Science Symposium  

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    Country:Japan

  • 第34回の若い世代の特別講演会

    2021.03   日本化学会  

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    Country:Japan

  • Global Session Best Presentation Award

    2021.01   The 59th Ceramics Basic Science Symposium  

  • 日本セラミックス協会 進歩賞

    2019.11   日本セラミックス協会  

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    Country:Japan

  • 第13回 日本ゾル-ゲル学会『Best Poster award』

    2015.11   日本ゾル-ゲル学会  

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    Country:Japan

  • XVIII International Sol-Gel Conference『Excellent poster award』

    2015.09   International Sol-Gel Society  

  • 粉体粉末冶金学会 平成26年度春季大会『優秀講演発表賞』

    2014.06   粉体粉末冶金学会  

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    Country:Japan

  • SiO2 Advanced Dielectrics and Related Devices Ⅹ International Symposium『Young Scientist Award』

    2014.06   SiO2 Advanced Dielectrics and Related Devices Ⅹ International Symposium  

  • CIPS2013(CSIRO Intelligent Processing Symposium and Workshop)『Best Poster Presentation』

    2013.05   CSIRO Intelligent Processing Symposium and Workshop  

  • 2012 OPU-KIST-ECUST Joint Symposium on Advanced Materials and their Applications『Best Poster Award』

    2012.09   OPU-KIST-ECUST Joint Symposium on Advanced Materials and their Applications  

  • 日本表面科学会関西支部20周年 若手ポスター発表会 『優秀ポスター賞』

    2012.03   日本表面科学会関西支部  

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    Country:Japan

  • 16th International Sol-Gel Conference『Best Poster Award』

    2011.09   International Sol-Gel Society  

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Job Career (off-campus)

  • 大阪公立大学   大学院工学研究科 物質・化学系専攻

    2022.04 - Now

  • Osaka Prefecture University

    2020.11 - 2022.03

  • 国立研究開発法人 科学技術振興機構 さきがけ研究員兼任

    2019.10 - Now

  • Japan Science and Technology Agency

    2019.10 - Now

  • Osaka Prefecture University   Graduate School of Engineering, Division of Materials Science and Engineering

    2017.11 - 2020.10

  • 大阪大学大学院工学研究科応用化学専攻 助教

    2015.11 - 2017.10

  • 日本学術振興会特別研究員(PD)

    2014.10 - 2015.10

  • 日本学術振興会特別研究員(DC1)

    2013.04 - 2014.09

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Papers

  • Accelerated Water Desorption of Oligomeric Poly(ethylene glycol) by Addition of Poly(propylene glycol) for Energy-Efficient Water Recovery Systems Reviewed

    Daisuke Ikegawa, Arisa Fukatsu, Kenji Okada, Masahide Takahashi

    ACS Omega   2024.01

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.1021/acsomega.3c07310

  • Polarization-dependent plasmonic heating in epitaxially grown multilayered metal–organic framework thin films embedded with Ag nanoparticles Reviewed

    Kenji Okada, Risa Mashita, Arisa Fukatsu, Masahide Takahashi

    Nanoscale Advances   5 ( 6 )   1795 - 1801   2023.02

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Polarization-dependent plasmonic heating by lasers in a multilayered metal–organic framework (MOF-on-MOF) oriented film embedded with silver nanoparticles, paving the way for MOF-based thin-film devices with temperature-controllable electrical and optical properties.

    DOI: 10.1039/D2NA00882C

  • Alcohol-induced deboronation of organoborosilicate thin films Reviewed

    Arisa Fukatsu, Ayana Karim, Kenji Okada, Masahide Takahashi

    Journal of Sol-Gel Science and Technology   104 ( 3 )   485 - 489   2022.12( ISSN:0928-0707

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.1007/s10971-022-05897-8

    Other URL: https://link.springer.com/article/10.1007/s10971-022-05897-8/fulltext.html

  • Guest Alignment and Defect Formation during Pore Filling in Metal–Organic Framework Films Reviewed

    Bettina Baumgartner, Risa Mashita, Arisa Fukatsu, Kenji Okada, Masahide Takahashi

    Angewandte Chemie International Edition   61 ( 28 )   e202201725   2022.07( ISSN:1433-7851

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    The degree of pore filling is an important parameter for defining guest@MOF properties in applications including electronics, optics, and gas separation. However, the interplay of key aspects of host–guest interactions, such as a quantitative description of the guest alignment or the structural integrity of the host as function of pore filling are yet to be determined. Polarisation-dependent infrared spectroscopy in attenuated total reflection configuration combined with gas sorption allowed to simultaneously study the orientation of the guest molecule and structural changes of the MOF framework during the pore filling process. Thereby we found, that initially randomly oriented guest molecules align with increasing pore filling during adsorption from the gas phase. At the same time, the framework itself undergoes a reversible, guest molecule-dependent rotation of the aromatic linker and a linker detachment process, which induce defects.

    DOI: 10.1002/anie.202201725

    Other URL: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.202201725

  • Crystalline Framework Formation in Single-digit Nanometer Scale Silica Nanoparticles of Reverse Mesostructure Reviewed

    Shigeru Sakamoto, Kenji Okada, Shinji Tanaka, Yasuhito Kotera, Arisa Fukatsu, Masahide Takahashi

    Chemistry Letters   51 ( 6 )   605 - 609   2022.06( ISSN:0366-7022

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.1246/cl.220108

  • Ausrichtung von Gastmolekülen und Defektbildung während der Porenfüllung in Metallorganischen Gerüstverbindungsdünnschichten Reviewed

    Bettina Baumgartner, Risa Mashita, Arisa Fukatsu, Kenji Okada, Masahide Takahashi

    Angewandte Chemie   2022.05

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.1002/ange.202201725

  • Colloidal dispersion of chiral layered hydroxide salt (LHS) nanocrystals exhibiting chiroptical response Reviewed

    Yasuaki Tokudome, Akihiro Koyama, Hidenobu Murata, Kenji Okada, Atsushi Nakahira, Shigenori Nishimura, Masahide Takahashi

    Journal of Sol-Gel Science and Technology   104   580 - 587   2022.04( ISSN:0928-0707

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Chiral inorganic materials have attracted increasing attention in the fields such as catalysis, electronics, photonics, and sensing. A new class of functional materials with chirality is extensively explored. Herein, we demonstrate the synthesis of nanometric nickel layered hydroxide salt (Ni-LHS) modified with chiral amino acids, (D- or L-) phenylalanine (PHE). An alkalization reaction in a starting mixture of nickel-phenylalanine aqua complexes was induced by using propylene oxide, leading to intercalate and adsorb phenylalanine on the surface and into the interlayers of Ni-LHS in an in-situ manner. The chiral molecules also act as surface modifier to inhibit the extensive crystal growth and aggregation, to form Ni-LHS with a diameter of 2–3 nm in a state of stablly-suspended in a solvent. It was also found that Ni-LHS exhibit induced circular dichroism (ICD) in the spectral range of d-d transitions of Ni(II) metal centres. The layered nanomaterials with chiroptical response demonstrated here is a promising option as an advanced adsorbent for detection of molecules. [Figure not available: see fulltext.]

    DOI: 10.1007/s10971-022-05766-4

  • Semi‐Automatic Deposition of Oriented Cu(OH)2 Nanobelts for the Heteroepitaxial Growth of Metal–Organic Framework Films Reviewed

    Mercedes Linares‐Moreau, Lea A. Brandner, Tomas Kamencek, Sumea Klokic, Francesco Carraro, Kenji Okada, Masahide Takahashi, Egbert Zojer, Christian J. Doonan, Paolo Falcaro

    Advanced Materials Interfaces   8 ( 21 )   2101039 - 2101039   2021.10( ISSN:2196-7350

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Processing oriented metal–organic frameworks (MOFs) as thin films is a key challenge for their application to device fabrication. However, typical fabrication methods cannot generate precisely oriented crystals on commercially relevant scales (i.e., cm2). This limits access to applications that require anisotropic functional properties (e.g., separation, optics, and electronics). Currently, highly oriented copper-based MOFs are synthesized via the addition of the organic MOF component to an ethanolic solution of manually aligned Cu(OH)2 nanobelt films. In this work, the optimization of a semi-automatic method for the fabrication of precisely oriented MOF films that affords a 100% yield of high quality ceramic films at the centimeter scale is reported. This improved fabrication protocol will facilitate the progress of heteroepitaxially grown MOFs for molecular separators and micro-opto-electronic devices.

    DOI: 10.1002/admi.202101039

    Other URL: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/admi.202101039

  • Semi‐Automatic Deposition of Oriented Cu(OH)2 Nanobelts for the Heteroepitaxial Growth of Metal–Organic Framework Films Reviewed

    M. Linares‐Moreau, L. A. Brandner, T. Kamencek, S. Klokic, F. Carraro, K. Okada, M. Takahashi, E. Zojer, C. J. Doonan, P. Falcaro

    Advanced Materials Interfaces 雑誌   2021.10

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    Kind of work:Joint Work  

  • Infrared crystallography for framework and linker orientation in metal–organic framework films Reviewed

    B. Baumgartner, K. Ikigaki, K. Okada, M. Takahashi

    Chemical Science 雑誌   12 ( 27 )   9298 - 9308   2021.05

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    Kind of work:Joint Work  

  • Epitaxial Growth of Multilayered Metal-Organic Framework Thin Films for Electronic and Photonic Applications Reviewed

    K. Ikigaki, K. Okada, M. Takahashi

    ACS Applied Nano Materials 雑誌   2021

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    Kind of work:Joint Work  

  • Synthesis of high-specific-surface-area Li-Al mixed metal oxide: Through nanoseed-assisted growth of layered double hydroxide Reviewed

    M. Takemoto, Y. Tokudome, H. Murata, K. Okada, M. Takahashi, A. Nakahira

    Applied Clay Science 雑誌   203   2021

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    Kind of work:Joint Work  

  • Reactivity of silanol group on siloxane oligomers for designing molecular structure and surface wettability Reviewed

    D. Kino, K. Okada, Y. Tokudome, M. Takahashi, L. Malfatti, P. Innocenzi

    Journal of Sol-Gel Science and Technology 雑誌   97 ( 3 )   734 - 742   2021

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    Kind of work:Joint Work  

  • Synthesis of high-specific-surface-area Li-Al mixed metal oxide: Through nanoseed-assisted growth of layered double hydroxide Reviewed

    Takemoto, M., Tokudome, Y., Murata, H., Okada, K., Takahashi, M., Nakahira, A.

    Applied Clay Science   203   106006 - 106006   2021( ISSN:0169-1317

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.1016/j.clay.2021.106006

  • Reactivity of silanol group on siloxane oligomers for designing molecular structure and surface wettability Reviewed

    Kino, D., Okada, K., Tokudome, Y., Takahashi, M., Malfatti, L., Innocenzi, P.

    Journal of Sol-Gel Science and Technology   97 ( 3 )   734 - 742   2021( ISSN:1573-4846

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Molecular structures of siloxane materials should be highly controlled for achieving advanced functionalities. However, it is still difficult to precisely control the structure of siloxane materials by the sol–gel processing. In the present study, we focused on the silanol groups in the intermediate oligomers and resultant siloxane materials as a key structural unit for controlling the molecular structure. Thermal stability and chemical reactivity of silanol groups were found to be highly dependent on the steric effects of the surrounding side chains and siloxane skeletons. The present work suggests that controlling the steric effects around silanol groups in the intermediate oligomers allows modulating the crosslink density of siloxane skeletons. The selective molecular modification tunes the structure and chemical properties of the resultant siloxane materials. [Figure not available: see fulltext.]

    DOI: 10.1007/s10971-020-05448-z

  • Oriented growth of semiconducting TCNQ@Cu3(BTC)2 MOF on Cu(OH)2: crystallographic orientation and pattern formation toward semiconducting thin-film devices Reviewed

    Kenji Okada, Keyaki Mori, Arisa Fukatsu, Masahide Takahashi

    Journal of Materials Chemistry A   9 ( 35 )   19613 - 19618   2021( ISSN:2050-7488

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    Oriented film and pattern of TCNQ@Cu<sub>3</sub>(BTC)<sub>2</sub>(HKUST-1) fabricated <italic>via</italic> epitaxial growth exhibit anisotropic electrical properties toward MOF-based (flexible) thin-film smart device applications, such as transistors and thermoelectric thin films.

    DOI: 10.1039/d1ta02968a

  • Infrared crystallography for framework and linker orientation in metal–organic framework films Reviewed

    Bettina Baumgartner, Ken Ikigaki, Kenji Okada, Masahide Takahashi

    Chemical Science   12 ( 27 )   9298 - 9308   2021( ISSN:2041-6520

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    <p>Polarization-dependent infrared spectroscopy of oriented metal organic framework films fills the information gap left by diffraction methods and gives access to the orientation of the aromatic linker and initial orientation of ultra-thin films.</p>

    DOI: 10.1039/d1sc02370e

  • Epitaxial Growth of Multilayered Metal-Organic Framework Thin Films for Electronic and Photonic Applications Reviewed

    Ikigaki, K., Okada, K., Takahashi, M.

    ACS Applied Nano Materials   4 ( 4 )   3467 - 3475   2021( ISSN:2574-0970

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Multilayered metal-organic frameworks (MOF) thin films, called MOF-on-MOF thin films, generate integrated and multiple functionalities toward high-performance sensing, electrochemical, and optical devices. Although epitaxy at the MOF/MOF interfaces in these multilayered MOF films plays a crucial role for high functionalities, the effect of structural consistency at a molecular scale at the epitaxial interface on the quality of the films (e.g., crystallite size and degree of orientation of MOF-on-MOF thin films) has not been explored. Here, we report the factors governing such physical parameters by revealing a relationship between lattice mismatch ratios and orientations of MOF-on-MOF thin films with epitaxial interfaces (referred as to "e-MoM thin films"). Highly oriented e-MoM thin films were successfully obtained by considering not only lattice mismatch ratios but also stacking order depending on the lattice parameters of MOF components. Because of the chemical and structural tunability of e-MoM materials, the present finding will offer insight into fabricating e-MoM thin films for designing future MOF-based devices.

    DOI: 10.1021/acsanm.0c03462

  • Controlling the alignment of 1D nanochannel arrays in oriented metal-organic framework films for host-guest materials design Reviewed

    K. Okada, M. Nakanishi, K. Ikigaki, Y. Tokudome, P. Falcaro, C.J. Doonan, M. Takahashi

    Chemical Science 雑誌   11 ( 30 )   8005 - 8012   2020

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    Kind of work:Joint Work  

  • Thermo-responsive wettability: Via surface roughness change on polymer-coated titanate nanorod brushes toward fast and multi-directional droplet transport Reviewed

    K. Okada, Y. Miura, T. Chiya, Y. Tokudome, M. Takahashi

    RSC Advances 雑誌   10 ( 47 )   28032 - 28036   2020

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    Kind of work:Joint Work  

  • Synthesis of a Crystalline and Transparent Aerogel Composed of Ni-Al Layered Double Hydroxide Nanoparticles through Crystallization from Amorphous Hydrogel Reviewed

    M. Takemoto, Y. Tokudome, D. Noguchi, R. Ueoka, K. Kanamori, K. Okada, H. Murata, A. Nakahira, M. Takahashi

    Langmuir 雑誌   36 ( 32 )   9436 - 9442   2020

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    Kind of work:Joint Work  

  • Preparation of silicophosphate alternating hybrid copolymers via nonaqueous acid-base reactions of phosphoric acid and organo-bridged Bis(chlorosilane) Reviewed

    K. Okada, M. Takano, Y. Tokudome, Y. Tokuda, M. Takahashi

    Molecules 雑誌   25 ( 1 )   2020

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    Kind of work:Joint Work  

  • One-dimensional metal hydroxide nanomaterials with macroscopically controlled orientation and aggregation: Fascinating surface hydroxyl groups on anisotropic structures for functionalities Reviewed

    K. Okada

    Journal of the Ceramic Society of Japan 雑誌   128 ( 9 )   627 - 634   2020

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    Kind of work:Single Work  

  • Imparting CO<inf>2</inf> reduction selectivity to ZnGa<inf>2</inf>O<inf>4</inf> photocatalysts by crystallization from hetero nano assembly of amorphous-like metal hydroxides Reviewed

    M. Takemoto, Y. Tokudome, S. Kikkawa, K. Teramura, T. Tanaka, K. Okada, H. Murata, A. Nakahira, M. Takahashi

    RSC Advances 雑誌   10 ( 14 )   8066 - 8073   2020

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    Kind of work:Joint Work  

  • Fabrication of Metal-organic Framework (MOF) thin films from copper hydroxide nano-assemblies Reviewed

    K. Ikigaki, K. Okada, M.. Takahashi

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 雑誌   67 ( 3 )   132 - 139   2020

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  • Thermo-responsive wettability: Via surface roughness change on polymer-coated titanate nanorod brushes toward fast and multi-directional droplet transport Reviewed

    Okada, K., Miura, Y., Chiya, T., Tokudome, Y., Takahashi, M.

    RSC Advances   10 ( 47 )   28032 - 28036   2020( ISSN:2046-2069

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    © The Royal Society of Chemistry. A novel approach for thermo-responsive wettability has been accomplished by surface roughness change induced by thermal expansion of paraffin coated on titanate nanostructures. The surface exhibits thermo-responsive and reversible wettability change in a hydrophobic regime; the surface shows superhydrophobicity with contact angles of ∼157° below 50 °C and ∼118° above 50 °C due to a decrease of surface roughness caused by thermally-expanded paraffin at higher temperatures. Reversible wettability change of ∼40° of a contact angle allows for fast and multi-directional droplet transport. The present approach affords a versatile selection of materials and wide variety of contact angles, promoting both scientific advancement and technology innovation in the field of smart surfaces. This journal is

    DOI: 10.1039/d0ra05471b

  • Synthesis of a Crystalline and Transparent Aerogel Composed of Ni-Al Layered Double Hydroxide Nanoparticles through Crystallization from Amorphous Hydrogel Reviewed

    Takemoto, M., Tokudome, Y., Noguchi, D., Ueoka, R., Kanamori, K., Okada, K., Murata, H., Nakahira, A., Takahashi, M.

    Langmuir   36 ( 32 )   9436 - 9442   2020( ISSN:1520-5827

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    © 2020 American Chemical Society. Enormous efforts have been devoted to the development of crystalline aerogels toward heterogeneous catalysis, energy storage, ion/molecular absorption, and luminescence. However, properties of aerogels are not fully exploited due to their low content of functional moieties embedded in their solid networks, low crystallinity, and limited chemical compositions. Herein, we develop a one-pot approach based on crystallization from amorphous metal hydroxides modified with a β-diketone ligand, toward crystalline transition-metal hydroxide aerogels. Synthesis of monolithic and crystalline aerogels of layered double hydroxide (LDH) was performed in a Ni-Al system starting from aqueous ethanol solutions of NiCl2·6H2O and AlCl3·6H2O with acetylacetone (acac) as an organic ligand. Propylene oxide (PO) as an alkalization reagent was added into precursory solutions to yield monolithic wet gels. The successive pH increase induces the formation of a three-dimensional (3-D) solid framework composed of amorphous Al(OH)3. Then, amphoteric Al(OH)3 undergoes crystallization into Ni-Al LDH via an acetylacetone-driven dissolution-crystallization of metal hydroxides without destroying the preformed 3-D solid framework. The process allows us to obtain crystalline aerogel monoliths with high porosity and high transparency after supercritical CO2 drying of wet gels. The present scheme can be expected to synthesize functionalized aerogel composed of crystalline transition-metal oxide/hydroxide nanobuilding blocks (NBBs).

    DOI: 10.1021/acs.langmuir.0c01292

    PubMed

  • Preparation of silicophosphate alternating hybrid copolymers via nonaqueous acid-base reactions of phosphoric acid and organo-bridged Bis(chlorosilane) Reviewed

    Okada, K., Takano, M., Tokudome, Y., Tokuda, Y., Takahashi, M.

    Molecules   25 ( 1 )   2020( ISSN:1420-3049

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    © 2019 by the authors. Licensee MDPI, Basel, Switzerland. A design of atomic and oligomer level structure in organic-inorganic hybrid materials is highly important for various applications. Nonaqueous acid-base reaction allows us to prepare silicophosphates with controlled inorganic networks (-(O-P-O-Si)n) at atomic level because phosphorous and silicon-based precursors can react directly, resulting in an alternating copolymer network. Organic functionalization in those materials has been realized so far by using organic-modified phosphorous acid and/or organo-chlorosilane as precursors. In the present study, silicophosphate oligomers exhibiting inorganic-organic hybrid chains of (-(O-P-O-Si-R-Si)n) (R: bridging organic functional groups), are prepared from phosphoric acid and organo-bridged bis(chlorosilane). The 1, 2-bis(chlorodimethylsilyl)ethane ((C2H4)(Me2SiCl)2) and 1, 4-bis(chlorodimethylsilyl)benzene ((C6H4)(Me2SiCl)2) were used as organo-bridged bis(chlorosilane). Different types of silicophosphate oligomers with different network structures and terminal groups (P-OH and/or Si-Cl) were prepared by changing the reaction temperature and molar ratio of precursors. The formation of low molecular weight oligomers of ring and cage morphologies (ring tetramer, cage pentamer, and ring hexamer) is suggested in the product prepared from phosphoric acid and (C6H4)(Me2SiCl)2 molecule at 150 °C. Those silicophosphate hybrid oligomers are expected to be used as building blocks of hybrid materials with well-defined network structures for desired functionalities.

    DOI: 10.3390/molecules25010127

    PubMed

  • One-dimensional metal hydroxide nanomaterials with macroscopically controlled orientation and aggregation: Fascinating surface hydroxyl groups on anisotropic structures for functionalities Reviewed

    Okada, K.

    Journal of the Ceramic Society of Japan   128 ( 9 )   2020( ISSN:1348-6535

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.2109/jcersj2.20105

  • Imparting CO<inf>2</inf> reduction selectivity to ZnGa<inf>2</inf>O<inf>4</inf> photocatalysts by crystallization from hetero nano assembly of amorphous-like metal hydroxides Reviewed

    Takemoto, M., Tokudome, Y., Kikkawa, S., Teramura, K., Tanaka, T., Okada, K., Murata, H., Nakahira, A., Takahashi, M.

    RSC Advances   10 ( 14 )   8066 - 8073   2020( ISSN:2046-2069

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Imparting an enhanced CO2 reduction selectivity to ZnGa2O4 photocatalysts has been demonstrated by controlled crystallization from interdispersed nanoparticles of zinc and gallium hydroxides. The hydroxide precursor in which Zn(ii) and Ga(iii) are homogeneously interdispersed was prepared through an epoxide-driven sol-gel reaction. ZnGa2O4 obtained by a heat-treatment exhibits a higher surface basicity and an enhanced affinity for CO2 molecules than previously-reported standard ZnGa2O4. The enhanced affinity for CO2 molecules of the resultant ZnGa2O4 leads to highly-selective CO evolution in CO2 photo-reduction with H2O reductants. The present scheme is promising to achieve desirable surface chemistry on metal oxide photocatalysts.

    DOI: 10.1039/d0ra00710b

  • Fabrication of Metal-organic Framework (MOF) thin films from copper hydroxide nano-assemblies Reviewed

    Ikigaki, K., Okada, K., Takahashi, M.

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   67 ( 3 )   132 - 139   2020( ISSN:0532-8799

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Thin films of metal-organic frameworks (MOFs) have attracted huge interests for various applications (e.g., sensing, catalysts and opto-electronics) due to their large porosity and tunable chemical property. Controlling the position and orientation of MOF crystals on device-scale substrates (over the centimeter scale) is required for the practical use of these sophisticated applications. Cu(OH)2 is a good precursor of the Cu-based MOF thin film due to their high reactivity with organic linkers, which allows for the growth of MOFs under mild conditions. In addition, lattice matching allows for the epitaxial growth of MOFs on Cu(OH)2. This article describes our recent progress on the fabrication of MOF thin films grown on assemblies of nanostructured Cu(OH)2. The approach enables us to control both position and orientation of MOF crystals on a substrate. The present approach for oriented MOF thin film growth is expanded for the oriented MOF-on-MOF thin films where different types of MOF layers possess epitaxial interfaces. A unique anisotropic plasmon resonance is found in the oriented MOFon- MOF films accommodating Ag nanoparticles. These materials demonstrated here are considered as good candidates for functional porous coatings for solid catalysts, bio-sensors, electrical/optical devises and others.

    DOI: 10.2497/jjspm.67.132

  • Controlling the alignment of 1D nanochannel arrays in oriented metal-organic framework films for host-guest materials design Reviewed

    Okada, K., Nakanishi, M., Ikigaki, K., Tokudome, Y., Falcaro, P., Doonan, C.J., Takahashi, M.

    Chemical Science   11 ( 30 )   8005 - 8012   2020( ISSN:2041-6539

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    © 2020 The Royal Society of Chemistry. Controlling the direction of molecular-scale pores enables the accommodation of guest molecular-scale species with alignment in the desired direction, allowing for the development of high-performance mechanical, thermal, electronic, photonic and biomedical organic devices (host-guest approach). Regularly ordered 1D nanochannels of metal-organic frameworks (MOFs) have been demonstrated as superior hosts for aligning functional molecules and polymers. However, controlling the orientation of MOF films with 1D nanochannels at commercially relevant scales remains a significant challenge. Here, we report the fabrication of macroscopically oriented films of Cu-based pillar-layered MOFs having regularly ordered 1D nanochannels. The direction of 1D nanochannels is controllable by optimizing the crystal growth process; 1D nanochannels align either perpendicular or parallel to substrates, offering molecular-scale pore arrays for a macroscopic alignment of functional guest molecules in the desired direction. Due to the fundamental interest and widespread technological importance of controlling the alignment of functional molecules and polymers in a particular direction, orientation-controllable MOF films will open up the possibility of realising the potential of MOFs in advanced technologies.

    DOI: 10.1039/d0sc02958k

  • Innentitelbild: MOF‐on‐MOF: Oriented Growth of Multiple Layered Thin Films of Metal–Organic Frameworks (Angew. Chem. 21/2019) Reviewed

    Ken Ikigaki, Kenji Okada, Yasuaki Tokudome, Takashi Toyao, Paolo Falcaro, Christian J. Doonan, Masahide Takahashi

    Angewandte Chemie   131 ( 21 )   6856 - 6856   2019.05

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    DOI: 10.1002/ange.201904691

  • MOF‐on‐MOF: Oriented Growth of Multiple Layered Thin Films of Metal–Organic Frameworks Reviewed

    K. Ikigaki, K. Okada, Y. Tokudome, T. Toyao, P. Falcaro, C. Doonan, M. Takahashi

    Angewandte Chemie International Edition 雑誌   131 ( 21 )   6960 - 6964   2019.05

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  • Inside Cover: MOF-on-MOF: Oriented Growth of Multiple Layered Thin Films of Metal-Organic Frameworks (Angew. Chem. Int. Ed. 21/2019) Reviewed

    Ken Ikigaki, Kenji Okada, Yasuaki Tokudome, Takashi Toyao, Paolo Falcaro, Christian J. Doonan, Masahide Takahashi

    Angewandte Chemie International Edition   58 ( 21 )   6784 - 6784   2019.05

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    DOI: 10.1002/anie.201904691

  • MOF‐on‐MOF: Oriented Growth of Multiple Layered Thin Films of Metal–Organic Frameworks Reviewed

    Ken Ikigaki, Kenji Okada, Yasuaki Tokudome, Takashi Toyao, Paolo Falcaro, Christian J. Doonan, Masahide Takahashi

    Angewandte Chemie   131 ( 21 )   6960 - 6964   2019.05

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.1002/ange.201901707

  • Anisotropic and reversible deformation of mesopores and mesostructures in silica-based films under mechanical stimuli toward adaptive optical components Reviewed

    K. Okada, G. Asakura, T. Yamamoto, Y. Tokudome, M. Takahashi

    ACS Applied Nano Materials 雑誌   2 ( 4 )   2377 - 2382   2019.03

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    Kind of work:Joint Work  

  • Metal-organic framework thin films from copper hydroxide nano-assemblies Reviewed

    K. Ikigaki, K. Okada, Y. Tokudome, M. Takahashi

    Journal of Sol-Gel Science and Technology 雑誌   89 ( 1 )   128 - 134   2019.01

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    Kind of work:Joint Work  

  • Anisotropic and Reversible Deformation of Mesopores and Mesostructures in Silica-Based Films under Mechanical Stimuli toward Adaptive Optical Components Reviewed

    Okada, K., Asakura, G., Yamamoto, T., Tokudome, Y., Takahashi, M.

    ACS Applied Nano Materials   2 ( 4 )   2377 - 2382   2019( ISSN:2574-0970

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    Deformation of the mesostructures in surfactant/silica hybrid films and mesoporous silica films prepared on bulky elastomeric substrates is investigated by compressing the substrates along an in-plane direction of the films. The mesostructure in the surfactant/silica hybrid film consists of organized micelles and a silica matrix. The micelles are removed in the mesoporous silica films to leave mesopores. A grazing-incidence small-angle X-ray scattering investigation reveals that the mesostructures with C2mm symmetry anisotropically change under a compressive strain of 6% in both films; shrinkage of the lattice parameters is along the direction of compression and extension in the normal direction. Deformation is reversible below a strain as high as 6%. Anisotropic deformation of the mesostructures results in an anisotropic change of the refractive indices normal and parallel to the direction of the compression. Compression of the surfactant/silica hybrid film induces a decrease of the refractive index parallel to the surface and an increase normal to the surface on the order of 10-3, while an opposite result is observed for the mesoporous silica film. The present finding gives us fundamental insight into the development of adaptive optical components for sensing, attenuation, switching, modulation, shutters, filters, and others in soft-material-based devices.

    DOI: 10.1021/acsanm.9b00269

  • Monolithic SrTiO<inf>3</inf>/titanate nanotube/TiO<inf>2</inf> nanocomposite toward enhanced photocatalytic activity Reviewed

    Okada, K., Takahashi, M.

    Journal of the Ceramic Society of Japan   127 ( 10 )   2019( ISSN:1348-6535

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.2109/jcersj2.19089

  • MOF-on-MOF: Oriented Growth of Multiple Layered Thin Films of Metal–Organic Frameworks Reviewed

    Ikigaki, K., Okada, K., Tokudome, Y., Toyao, T., Falcaro, P., Doonan, C.J., Takahashi, M.

    Angewandte Chemie - International Edition   58 ( 21 )   6886 - 6890   2019( ISSN:1521-3773

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    The precise alignment of multiple layers of metal–organic framework (MOF) thin films, or MOF-on-MOF films, over macroscopic length scales is presented. The MOF-on-MOF films are fabricated by epitaxially matching the interface. The first MOF layer (Cu2(BPDC)2, BPDC=biphenyl-4,4′-dicarboxylate) is grown on an oriented Cu(OH)2 film by a “one-pot” approach. Aligned second (Cu2(BDC)2, BDC=benzene 1,4-dicarboxylate, or Cu2(BPYDC)2, BPYDC=2,2′-bipyridine-5,5′-dicarboxylate) MOF layers can be deposited using liquid-phase epitaxy. The co-orientation of the MOF films is confirmed by X-ray diffraction. Importantly, our strategy allows for the synthesis of aligned MOF films, for example, Cu2(BPYDC)2, that cannot be grown on a Cu(OH)2 surface. We show that aligned MOF films furnished with Ag nanoparticles show a unique anisotropic plasmon resonance. Our MOF-on-MOF approach expands the chemistry of heteroepitaxially oriented MOF films and provides a new toolbox for multifunctional porous coatings.

    DOI: 10.1002/anie.201901707

    PubMed

  • High rate capability by sulfur-doping into LiFePO4 matrix Reviewed

    K. Okada, I. Kimura, K. Machida

    RSC Advances 雑誌   8 ( 11 )   5848 - 5853   2018

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    Kind of work:Joint Work  

  • Electrochemical sensing and catalysis using Cu3(BTC)2 coating electrodes from Cu(OH)2 films Reviewed

    K. Okada, S. Sawai, K. Ikigaki, Y. Tokudome, P. Falcaro, M. Takahashi

    CrystEngComm 雑誌   19 ( 29 )   4194 - 4200   2017

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    Kind of work:Joint Work  

  • Centimetre scale micropore alignment in ‘single-crystal-like’ Metal-Organic Framework films via hetero-epitaxial growth Reviewed

    P. Falcaro, K. Okada, T. Hara, K. Ikigaki, Y. Tokudome, A. Thornton, A.J. Hill, T. Williams, C. Doonan, M. Takahashi

    Nature Materials 雑誌   16 ( 3 )   342 - 348   2017

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    Kind of work:Joint Work  

  • Superhydrophobic adhesive surface on titanate nanotube brushes through surface modification by capric acid Reviewed

    K. Okada, Y. Tokudome, M. Takahashi

    Journal of sol-gel science and technology 雑誌   79 ( 2 )   389 - 394   2016

  • Macroporous Titanate Nanotube/TiO2 Monolith for Fast and Large-Capacity Cation Exchange Reviewed

    K. Okada, G. Asakura, A. Nakahira, Y. Tokudome, M. Takahashi

    Chemistry of Materials 雑誌   27 ( 5 )   1885 - 1891   2015

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    Kind of work:Joint Work  

  • Positioning of the HKUST-1 metal–organic framework (Cu3(BTC)2) through conversion from insoluble Cu-based precursors Reviewed

    T. Toyao, K. Liang, K. Okada, R. Ricco, M. J. Styles, Y. Tokudome, Y. Horiuchi, A. J. Hill, M. Takahashi, M. Matsuoka, P. Falcaro

    Inorganic Chemistry Frontiers 雑誌   2 ( 5 )   434 - 441   2015

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    Kind of work:Joint Work  

  • Copper conversion into Cu(OH)2 nanotubes for positioning Cu3(BTC)2 MOF crystals: controlling the growth on flat, 3D architecture and patterns Reviewed

    K. Okada, R. Ricco, Y. Tokudome, M. J. Styles, A. J. Hill, M. Takahashi, P. Falcaro

    Advanced Functional Materials 雑誌   24 ( 14 )   1969 - 1977   2014

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    Kind of work:Joint Work  

  • Micropattern formation by molecular migration via UV-induced dehydration of block copolymer Reviewed

    K. Okada, Y. Tokudome, K. Konstas, R. Makiura, L. Malfatti, P. Innocenzi, H. Ogawa, T. Kanaya, P. Falcaro, M. Takahashi

    Advanced Functional Materials 雑誌   24 ( 19 )   2801 - 2809   2014

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    Kind of work:Joint Work  

  • Switchable and Reversible Water Adhesion on Superhydrophobic Titanate Nanostructures Fabricated on Soft Substrates: Photopatternable Wettability and Thermomodulatable Adhesivity Reviewed

    Y. Tokudome, K. Okada, A. Nakahira, M. Takahashi

    Journal of Materials Chemistry A 雑誌   65 ( 1 )   36 - 40   2013

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    Kind of work:Joint Work  

  • Highly oriented growth of titanate nanotubes (TNTs) in micro and confinement spaces on sol–gel derived amorphous TiO2 thin films under moderate hydrothermal condition Reviewed

    K. Okada, Y. Takamatsu, A. Nakahira, Y. Tokudome, M. Takahashi

    Journal of sol-gel science and technology 雑誌   2 ( 1 )   58 - 61   2013

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    Kind of work:Joint Work  

  • Titanate nanofunnel brushes: toward functional interfacial applications Reviewed

    K. Okada, Y. Tokudome, P. Falcaro, Y. Takamatsu, A. Nakahira, M. Takahashi

    Chemical Communications 雑誌   48 ( 49 )   6130 - 6132   2012

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  • Microfabrication of mesoporous silica encapsulated enzymes using deep X-ray lithography Reviewed

    C. M. Doherty, Y. Gao, B. Marmiroli, H. Amenitsch, F. Lisi, L. Malfatti, K. Okada, M. Takahashi, A. J. Hill, P. Innocenzi, P. Falcaro

    Journal of Materials Chemistry 雑誌   22 ( 32 )   16191 - 16195   2012

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  • Coffee stain-driven self-assembly of mesoporous rings Reviewed

    L. Malfatti, Y. Tokudome, K. Okada, S. Yagi, M. Takahashi, P. Innocenzi

    Microporous and mesoporous materials 雑誌   163   356 - 362   2012

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Books and Other Publications

  • 汎用FT-IR装置に3Dプリンター自作測定ホルダー装着して薄膜中の分子や化学結合の向きを検出

    岡田健司(ディビジョン・トピック)

    化学と工業  2022.06 

  • 無機化合物表面における金属有構造体の配向制御と機能制御 Reviewed

    岡田健司、高橋雅英( Role: Joint author ,  解説)

    日本ゼオライト学会 ゼオライト  2022.01 

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  • 困難とされてきた物質の配向を可能にする新しいアプローチ 金属水酸化物表面の特異な“場”を利用した物質配向

    岡田健司(飛躍する若手研究者)

    化学と工業  2021.12 

  • 解説「ナノメートルの穴が揃った多孔質MOF薄膜~薄膜に新たな機能を付加できるMOF配向制御~」

    岡田健司( Role: Sole author)

    月刊化学  2017.03 

Collaborative research (seeds) keywords

  • 溶液合成

  • 多孔質材料の合成

  • ナノ材料の合成

Other

  • 研究職歴

    2020.11 - Now

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    大阪府立大学大学院工学研究科物質・化学系専攻 准教授

  • 研究職歴

    2017.11 - 2020.10

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    大阪府立大学大学院工学研究科物質・化学系専攻 助教