Research Summary

We focus on organic and inorganic two-dimensional (2D) structures, such as layered structures, nanosheets, and polymer networks. The materials and their functions are designed by control of the structural flexibility. The soft 2D materials are designed and synthesized to energy, sensing, and medical applications. In addition, machine learning coupled with our chemical perspectives for small data is used to accelerate the research projects.

News

  • 2024
    • A new paper has been accepted for publication in Journal of Materials Chemistry B as a Paper.
      This paper shows that stimuli responsivity and large-scale coatability of layered polydiacetylene are controlled by the guest and matrix polymers, respectively. The coating visualized the temperature distribution on the shaft of an ultrasonic cutting device used in surgery, which causes the collateral thermal damages to the surrounding organs. This work is collaborative research with Prof. Satoru Matsuda and Prof. Hirofumi Kawakubo in School of Medicine, Keio University.
      Risako Shibata, Satoru Matsuda, Hirofumi Kawakubo, Hiroaki Imai, *Yuya Oaki, “Phase-separated structures of tunable thermoresponsive and matrix polymers for large-scale temperature monitoring coatings”
      Journal of Materials Chemistry B 2024, in press.
      A new paper has been accepted for publication in Chemical Communications as a Feature Article.
      This paper summarizes our recent works about combinations of stimuli-responsive materials for advanced sensing systems with Prof with Prof. Syuji Fujii in Osaka Institute of Technology. Prof Fujii introduces the soft active capsule materials. In addition, our results about combination of the layered polydiacetylene and other stimuli-responsive materials are summarized. This invited paper is listed in ChemComm's 60th Anniversary Collection.
      *Yuya Oaki, *Syuji Fujii, “Cascading responses of stimuli-responsive materials”
      Chemial Communications 2024, 60, 9163-9176. This paper is highlighted as aBack Cover.
      A new paper has been accepted for publication in Small.
      This paper shows a mechanoresponsive sponge device combining stimuli-responsive layered polydiacetylene and capsules with the enhanced spatiotemporal responsivity. The device enables visualization and quantification of weak compression stresses in kPa range. The device was applied to the force distribution imaging generated by surgical devices. This work is collaborative research with Prof. Syuji Fujii in Osaka Institute of Technology and Prof. Koji Okagayashi, Prof. Kohei Shigeta, and Prof. Ryo Seishima in School of Medicine, Keio University.
      Nahoko Ono, Ryo Seishima, Kohei Shigeta, Koji Okabayashi, Hiroaki Imai, *Syuji Fujii, *Yuya Oaki, “High-Sensitive Spatiotemporal Distribution Imaging of Compression Stresses Based on Time-Evolutional Responsiveness”
      Small 2024, 20, 2400938. This paper is highlighted as a Frontispiece.
      A new paper has been accepted for publication in Journal of Materials Chemistry A.
      This paper shows performance-prediction model of metal-free electrocatalyst for hydrogen evolution reaction. A new amorphous conjugated polymer network containing benzoquinone and benzoxazole moieties was designed and synthesized based on the prediction. The hydration state of the conjugated polymer network plays an important role for the catalytic activity in an aqueous medium. This work is collaborative research with Prof. Yasuhiko Igarashi in University of Ttukuba and Prof. Mafumi Hishida in Tokyo University of Science.
      Wakana Hamada, Mafumi Hishida, Ryuto Sugiura, Haruka Tobita, Hiroaki Imai, Yasuhiko Igarashi and Yuya Oaki*, “Imaging of Accumulated Mechanical Stresses Using Self-Assembled Layered Conjugated Polymer"
      Journal of Materials Chemistry A 2024, 12, 3294-3303. This paper is highlighted as a Inside back cover.
      A new paper has been accepted for publication in Nanoscale Advances.
      This paper shows a new synthetic method for the morphology and size control of benzoquinone-pyrrole amorphous conjugated polymer networks with the activity as an electrocatalyst for hydrogen evolution reaction.
      Ryuto Sugiura, Hiroaki Imai and Yuya Oaki*, “Morphology and size control of an amorphous conjugated polymer network containing quinone and pyrrole moieties via precipitation polymerization"
      Nanoscale Advances 2024, 6, 1084–1090. This paper is highlighted as a Inside back cover.
      A new paper has been accepted for publication in Advanced Materials Interfaces.
      This paper shows direct AFM observation of the differences in the mechanoresponsiveness of the layered polydiacetylenes with the intercalated guests. This work is collaborative research with Prof. Kaori Sugihara in The University of Tokyo.
      Bratati Das, Nano Shioda, Shunsuke Yagi, Yuya Oaki,* and Kaori Sugihara*, “Nanoscopic Force Sensitivity of Polydiacetylene 2D Layered Composites with Guest Molecules"
      Advanced Materials Interfaces 2024, 11, 2300745.
  • 2023
    • A new paper has been accepted for publication in ACS Applied Materials & Interfaces.
      This paper shows colorimetric imaging accumulated mechanical stresses using the composites of polyurethane and layered polydiacetylene with the specific guest polymers to achieve the mechanoresponsiveness.
      Yuki Mochizuki, Hiroaki Imai, Yuya Oaki*, “Imaging of Accumulated Mechanical Stresses Using Self-Assembled Layered Conjugated Polymer"
      ACS Applied Materials & Interfaces 2023, 15, 48725.
      A new paper has been accepted for publication in Langmuir.
      This paper shows vapor-phase syntheses of a conductive polymer nanoparticles in aqueous phase without using the surface stabilizer. This work is collaborative research with Prof. Syuji Fujii in Osaka Institute of Technology.
      Yuya Atsuta, Kazusa Takeuchi, Nano Shioda, Wakana Hamada, Tomoyasu Hirai, Yoshinobu Nakamura, Yuya Oaki*, Syuji Fujii*, “Colloidally Stable Polypyrrole Nanoparticles Synthesized by Surfactant-Free Coupling Polymerization"
      Langmuir 2023, 39, 14984.
      A new paper has been accepted for publication in Advanced Materials Interfaces.
      This paper shows synthesis and application of a new 2D material based on macrocycles. The macrocycle-based nanosheets have a characteristic flexibility. This work is collaborative research with Prof. Jong-Man Kim in Hanyang University.
      Nano Shioda, Jung-Moo Heo, Bubsung Kim, Hiroaki Imai, Jong-Man Kim,* Yuya Oaki*, “Nanoarchitectonics of Exfoliated Flexible Nanosheet Based on Laterally Stacked Macrocycles"
      Advanced Materials Interfaces 2023, 10, 2300521. This paper is highlighted as a Cover Picture.
      A new paper has been accepted for publication in Bulletin of the Chemical Society of Japan.
      This paper shows fluorine-free superhydrophobic coating over water contact angle 165 ° prepared using the surface-functionalized nanosheets.
      Ryota Hikichi, Yuki Tokura, Yasuhiko Igarashi, Hiroaki Imai, and Yuya Oaki*, “Fluorine-Free Substrate-Independent Superhydrophobic Coatings by Nanoarchitectonics of Polydispersed 2D Materials"
      Bulletin of the Chemical Society of Japan 2023, 96, 766.
      A new paper has been accepted for publication in Energy Advances.
      This paper shows the capacity prediction models for organic anode active materials of lithium-ion battery. The advancing processes of the predictors with an increasing the training data were studied in terms of data-scientific manner. This invited article is part of the themed collection: Artificial Intelligence & Machine Learning in Energy Storage & Conversion. This work is collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba and Prof. Masato Okada in The University of Tokyo.
      Haruka Tobita, Yuki Namiuchi, Takumi Komura, Hiroaki Imai, Koki Obinata, Masato Okada, Yasuhiko Igarashi*, Yuya Oaki*, “Capacity-prediction models for organic anode-active materials of lithium-ion batteries: advances in predictors using small data"
      Energy Advances 2023, 2, 1014. This paper is highlighted as a Back Cover.
      A new paper has been accepted for publication in Materials Horizons.
      This paper shows a mechanoresponsive paper device combining stimuli-responsive layered polydiacetylene and capsules. The device enables visualization and quantification of weak friction force. The device was applied to mapping the force distribution of motions in calligraphic writing. This work is collaborative research with Prof. Syuji Fujii in Osaka Institute of Technology and Prof. Seiichiro Katsura in Faculty of Science and Technology, Keio University.
      Nano Shioda, Ryotaro Kobayashi, Seiichiro Katsura, Hiroaki Imai, Syuji Fujii,* Yuya Oaki*, “High-sensitive friction-imaging device based on cascading stimuli responsiveness
      Materials Horizons 2023, 10, 2237.
      A new paper has been accepted for publication in Advanced Science.
      This paper shows a mechanoresponsive sponge device combining stimuli-responsive layered polydiacetylene and capsules. The device enables visualization and quantification of weak compression stresses in kPa range. The device was applied to image and measure the force distribution generated by a surgical device. This work is collaborative research with Prof. Syuji Fujii in Osaka Institute of Technology and Prof. Koji Okagayashi and Prof. Ryo Seishima in School of Medicine, Keio University.
      Nahoko Ono, Ryo Seishima, Koji Okabayashi, Hiroaki Imai, *Syuji Fujii, *Yuya Oaki, “Stimuli-Responsive Sponge for Imaging and Measuring Weak Compression Stresses”
      Advanced Science 2023, 10, 2206097. This paper is highlighted as a Frontispiece.
  • 2022
    • Our group members have received Best Poster Award (Ryota Hikich) and Poster Award (Nahoko Ono, Nano Shioda, Yuki Mochizuki) for their presentations in 12th CSJ Chemistry Festa on October 2022.
      A new paper has been accepted for publication in ACS Applied Materials & Interfaces.
      This paper shows softening layered polydiacetylene with the intercalation of bulky macromolecular guests. The softening enables the large-area coating and thermoresponsive color changes near our daily life. The thermal imaging device was applied to colorimetric estimation of the specific heat of liquids and visualization of temperature distribution on a simulated tissue during surgical operation using ultrasonic coagulation cutting device This work is collaborative research with Prof. Satoru Matsuda and Prof. Hirofumi Kawakubo in School of Medicine, Keio University.
      Aya Edagawa, Satoru Matsuda, Hirofumi Kawakubo, Hiroaki Imai, *Yuya Oaki, “Coatable 2D Conjugated Polymers Containing Bulky Macromolecular Guests for Thermal Imaging”
      ACS Applied Materials & Interfaces 2022, 14, 43792-43801. This paper is highlighted as Supplementary Journal Cover.
      A new paper has been accepted for publication in iScience (cell press).
      This paper shows correlation between the thickness and lateral-size distribution of the exfoliated nanosheets. According to the relationship, the thickness-controlled syntheses of transition-metal-oxides nanosheets are demonstrated with an assistance of the size-distribution predictor constructed in our previous work.
      Yuri Haraguchi, Hiroaki Imai, *Yuya Oaki, “Selective Syntheses of Thick and Thin Nanosheets Based on Correlation between Thickness and Lateral-Size Distribution”
      iScience 2022, 25, 104933.
      A new paper has been accepted for publication in Advanced Materials Interfaces.
      This paper shows the angle-independent structural color of the thin film based on the polydispersed nanosheets. The structural color is applied to sensing biogenic amines.
      Yuri Haraguchi, Hiroaki Imai, *Yuya Oaki, “Nanosheet-Based Uneven Thin Film Exhibiting Angle-Independent Structural Color and Its Application to Detection of Biogenic Amines”
      Adv. Mater. Interfaces 2022, 9, 2201111.
      A new paper has been accepted for publication in ACS Applied Energy Materials
      This paper shows construction of a revised capacity prediction model for organic anodes of lithium-ion battery. The prediction model constructed by sparse modeling for small data (SpM-S) facilitated finding 5-formylsalicylic acid as an overlooked high-performance organic anode. This work is collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba.
      Takumi Komura, Kosuke Sakano, Yasuhiko Igarashi, Hiromichi Numazawa, Hiroaki Imai, *Yuya Oaki, “A Capacity-Prediction Model for Exploration of Organic Anodes: Discovery of 5-Formylsalicylic Acid as a High-Performance Anode Active Material”
      ACS Appl. Energy Mater. 2022, 5, 8990-8998.
      A new paper has been accepted for publication in Nanoscale Advances.
      This minireview summarized our recent works about vapor-phase polymerization at low temperature to obtain coatings and composites of conjugated polymer materials for energy applications. This paper is an invited article for "Design and function of materials nanoarchitectonics." This paper is written with Dr. Kosuke Sato (Sagami Chemical Research Center), a former member of our group.
      *Yuya Oaki, Kosuke Sato, “Nanoarchitectonics for conductive polymers using solid and vapor phases”
      Nanoscale Advances 2022, 4, 2273-2281.
      A new paper has been accepted for publication in ACS Applied Energy Materials.
      This paper shows construction of performance prediction models for organic cathodes of lithium-ion battery. The prediction models of potential, capacity, and energy density were prepared by sparse modeling for small data (SpM-S) on small datasets based on literature data. This work is collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba and SoftBank Corp.
      Kosuke Sakano, Yasuhiko Igarashi, Hiroaki Imai, Shuntaro Miyakawa, Takaya Saito, Yoshiki Takayanagi, Koji Nishiyama, *Yuya Oaki, “Performance Predictors for Organic Cathodes of Lithium-Ion Battery”
      ACS Appl. Energy Mater. 2022, 5, 2074-2082.
      A new paper has been accepted for publication in Digital Discovery, which is launched by the Royal Society of Chemistry at 2022.
      This paper shows advantages of our sparse modeling for small data (SpM-S) compared to the other machine learning methods. Our group has been developed SpM-S, i.e. combination of machine learning and our chemical insight, to develop small-data-driven sciences. Here we studied the advantages of the original approach. This work is collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba. This paper is highlighted in Inside Cover and twitter of the journal.
      Yuri Haraguchi, Yasuhiko Igarashi, Hiroaki Imai, *Yuya Oaki, “A sparse modeling for small data: Case studies in controlled syntheses of 2D materials”
      Digital Discovery 2022, 1, 26-34
      A new paper has been accepted for publication in Sensors & Diagnostics, which is launched by the Royal Society of Chemistry at 2022.
      This paper shows a new layered macrocycle with the structural flexibility and intercalation capability. Unusually wide-range thermoresponsive color-changing properties were observed originating from the structural flexibility. The dynamic properties were applied to monitoring the temperature distribution during cryotherapy. This work is collaborative research with Prof. Jong-Man Kim in Hanyang University.
      Nano Shioda, Jung-Moo Heo, Bubsung Kim, Hiroaki Imai, *Jong-Man Kim, *Yuya Oaki, “Layered macrocycles with flexibility and tunable dynamic properties for wide-range thermoresponsive color changes”
      Sensors & Diagnostics 2022, 1, 160-168. This paper is highlighted as Inside Back Cover.
  • 2021
    • A new paper has been accepted for publication in Bulletin of the Cheimcal Society of Japan.
      This review paper summarized our recent works about sparse modeling for small data. This paper is an invited article for asterpiece Materials with Functional Excellence.
      *Yuya Oaki, Yasuhiko Igarash “Materials Informatics for 2D Materials Combined with Sparse Modeling and Chemical Perspective: Toward Small-Data-Driven Chemistry and Materials Science”
      Bulletin of the Chemical Society of Japan 2021, 94, 2410-2422. 　This paper is highlighted as the Inside Cover.
      A new paper has been accepted for publication in ChemPlusChem.
      This paper shows a new fotening strategy of layered polydiacetylene with the intercalation of the guest via hydrogen bonding. The soft layered structures showed wide-range thermoresponsive color-change properties. This paper is an invited article for 10th Anniversary Special Collection.
      Yuki Mochizuki, Hiroaki Imai, *Yuya Oaki, “A Layered Polydiacetylene Containing Hydrogen-Bonding 4,4′-Bipyridyl Guests: Reversible Color Changes with a Wide-Range Temperature Response”
      ChemPlusChem 2021, 86, 1563-1568. This paper is selected for the Cover Picture and highlighted in the Cover Profile with introduction of our group members。
      A new paper has been accepted for publication in Advanced Theory and Simulations.
      This paper shows size-distribution control for the exfoliated transition-metal-oxide 2D materials. The prediction model of the size distribution was constracted by machine learning, namely sparse modeling, on the small experimental data. This work is a collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba.
      Yuri Haraguchi, Yasuhiko Igarashi, Hiroaki Imai, *Yuya Oaki, “Size-Distribution Control of Exfoliated Nanosheets Assisted by Machine Learning: Small-Data-Driven Materials Science Using Sparse Modeling”
      Advanced Theory and Simulations 2021, 4, 2100158.
      A new paper has been accepted for publication in Chemical Communications.
      This paper shows high-yield syntheses of exfoliated graphite and conjucated polymer from the precursor layered materials based on van der Waals interaction. The yield prediction model for metal-oxide nanosheets based on materials informatics was applied to the other types of the layered materials. This work is a collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba.
      Kyohei Noda, Yasuhiko Igarashi, Hiroaki Imai, *Yuya Oaki, “Yield-prediction models for efficient exfoliation of soft layered materials into nanosheets”
      Chemical Communications 2021, 57, 5921-5924.
      A new paper has been accepted for publication in Nanoscale.
      This paper shows size-controlled syntheses of exfoliated transition-metal-oxide 2D materials. The size-prediction model was constracted by machine learning, namely sparse modeling, on the small experimental data. This work is a collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba.
      Ryosuke Mizuguchi, Yasuhiko Igarashi, Hiroaki Imai, *Yuya Oaki, “Lateral-Size Control of Exfoliated Transition-Metal-Oxide 2D Materials by Machine Learning on Small Data”
      Nanoscale 2021, 13, 3853-3859.
      A new paper has been accepted for publication in Advanced Materials.
      This paper shows integration of stimuli-responsive materilas, namely layered polydiacetylene (PDA) and dry liquid (DL), for detection of weak compression stresses. The new sensor device can detect compression stresses weker than kPa order. In general, it is not easy to induce the molecular motion and color change of the rigid chromophores in response to weak mechanical stresses. Our new integration strategy enables to achieve the high-sensitive detection through the response cascades. This is a collaborative research with Prof. Syuji Fujii in Osaka Institute of Technology.
      Minami Nakamitsu, Keigo Oyama, Hiroaki Imai, *Syuji Fujii, *Yuya Oaki, “Ultrahigh-Sensitive Compression-Stress Sensor using Integrated Stimuli-Responsive Materials”
      Advanced Materials 2021, 33, 2008755.
  • 2020
    • A new paper has been accepted for publication in Chemistry Letters as a Vol. 50 Commemorative Highlight Review.
      This review summarizes a new exfoliation chemistry of soft layered inorganic-organic composites toward syntheses of designed 2D materials. The review covers from the fundamentals of the new exfoliation chemistry to recent approaches using materials informatics (machine learning). The main conclusions are summary of the results based on the JST-PRESTO project in FY 2016-2019 (Materials Informatics).
      *Yuya Oaki, “Exfoliation Chemistry of Soft Layered Materials toward Tailored 2D Materials”
      Chemistry Letters 2020, DOI: 10.1246/cl.2007471.
      A new paper has been accepted for publication in Chamical Communications as a Feature Article.
      This review paper shows nice earlier works about soft layered materials with dynamic functions and our recent works about layered polydiacetylene with tunable stimuli-responsive color-change properties for sensing applications.
      *Yuya Oaki, “Intercalation and Flexibility Chemistries of Soft Layered Materials”
      Chemical Communications 2020,56, 13069-13081.
      This paper is highlighted in the Inside Cover.
      A new paper has been accepted for publication in Small.
      This paper shows color changes originating from molecular motion of rigid conjugated polymer, namely layered composites of polydiacetylene and L-arginie, at unusual low-temperature range even in the solid crystalline state.
      Kei Watanabe, Hiroaki Imai, *Yuya Oaki, “Solid-State Low-Temperature Thermoresponsive and Reversible Color Changes of Conjugated Polymer in Layered Structure”
      Small 2020, DOI: 10.1002/smll.202004586.
      This paper is highlighted in the Frontispiece.
      A new paper has been accepted for publication in Chemical Science.
      This paper shows a new amorphous flexible covalent network containing functional molecules and their superior electrochemical performances. This is a collaborative research with Prof. Chi-How Peng in National Tsing Hua University.
      Jumpei Suzuki, Akira Ishizone, Kosuke Sato, Hiroaki Imai, Yu-Jen Tseng, Chi-How Peng, *Yuya Oaki, “Amorphous flexible covalent organic networks containing redox-active moieties: A noncrystalline approach to assembly of functional molecules”
      Chemical Science 2020,11, 7003-7008.
      This paper is highlighted in the inside back cover.
      A new paper has been accepted for publication in Advanced Theory and Simulations.
      This paper shows efficienty syntheses of a variety of 2D materials guided by yield prediction model based on experiment-oriented materials informatics. This is a collaborative research with Dr. Yasuhiko Igarashi in University of Tokyo.
      Kyohei Noda, Yasuhiko Igarashi, Hiroaki Imai, *Yuya Oaki, “Efficient Syntheses of 2D Materials from Soft Layered Composites Guided by Yield Prediction Model: Potential of Experiment‐Oriented Materials Informatics”
      Advanced Theory and Simulations 2020, 3, 2000084.
      The following two papers are selected as TOP DOWNLOADED PAPER (2019/2020) in the journal. Our group published two papers about experiment-oriented materials informatcs based on small data. The concept was applied to efficient syntheses of nanosheets and exploration of high-performance organic anodes. These works are collaborative research with Prof. Yasuhiko Igarashi in University of Tsukuba with financial support by JST-PRESTO. We will continue to maximize the potential of materials informatics by experimental scientists for efficient exploration of processes and materials.
      Hiromichi Numazawa, Yasuhiko Igarashi, Kosuke Sato, Hiroaki Imai, *Yuya Oaki,
      “Experiment-Oriented Materials Informatics for Efficient Exploration of Design Strategy and New Compounds for High-Performance Organic Anode”
      Advanced Theory and Simulations 2019, 2, 1900130.
      Gentoku Nakada, Yasuhiko Igarashi, Hiroaki Imai, *Yuya Oaki,
      “Materials-Informatics-Assisted High-Yield Synthesis of 2D Nanomaterials through Exfoliation”
      Advanced Theory and Simulations 2019, 2, 1800180.
      A new paper has been accepted for publication in ACS Sensors.
      This paper shows visualization and quantification of microwave using thermo-responsive color-changing gel containing layered polydiacetylene (PDA).
      Minami Nakamitsu, Hiroaki Imai, *Yuya Oaki, “Visualization and Quantification of Microwave using Thermo-Responsive Color-Change Hydrogel”
      ACS Sensors 2020, 5, 133.
      A new paper has been accepted for publication in Journal of Materials Chemistry C.
      This paper shows visualization and quantification of a weak friction force using layered polymer composites of polydiacetylene (PDA) and polyethyleneimine (PEI).
      Kei Watanabe, Hiroaki Imai, *Yuya Oaki, “A paper-based device of a specially designed soft layered polymer composite for measurement of weak friction force”
      Journal of Materials Chemistry C 2020, 8, 1265.
      The related image will be highlighted in the Inside Back Cover.
      This paper is selected as 2020 Journal of Materials Chemistry C HOT papers.
  • 2019
    • A new paper has been accepted for publication in Chemical Communications.
      This paper shows visualization of molecular motion caused by glass transition of polystyrene using layered polydiacetylene (PDA). This is a collaborative research with Prof. Chi-How Peng in National Tsing Hua University.
      Shuhei Ishioka, Kei Watanabe, Hiroaki Imai, Yu-Jen Tseng, Chi-How Peng, *Yuya Oaki, “Glass-transition-induced color-changing resins containing layered polydiacetylene”
      Chemical Communications 2019,55, 11723.
      A new paper has been accepted for publication in Advanced Theory and Simulations.
      This paper shows efficient exploration of new organic-polymer anodes for lithium-ion battery by experiment-oriented materials informatics informatics combined with experimental, calculational, and data sciences. This is a collaborative research with Dr. Yasuhiko Igarashi in The University of Tokyo.
      Hiromichi Numazawa, Yasuhiko Igarashi, Kosuke Sato, Hiroaki Imai, *Yuya Oaki, “Experiment-Oriented Materials Informatics for Efficient Exploration of Design Strategy and New Compounds for High-Performance Organic Anode”
      Advanced Theory and Simulations 2019, 2, 1900130.
      The related image was highlighted in the Inside Cover.
      This achievement was featured in newspapers (in Japanese).
      Mr. Hiromichi Numazawa, the first author of this paper, was highlighted as a Spotlight-Research in Chem-Station, a Japanese famous chemistry-related website.
      A new paper has been accepted for publication in Communications Chemistry.
      This paper shows synthesis of amorphous organic layered materials and their exfoliation into the nanosheets. The organic nanosheets exhibited enhanced catalytic performances as a metal-free electrocatalyst for hydrogen evolution reaction.
      Shoichiro Yano, Kosuke Sato, Jumpei Suzuki, Hiroaki Imai, *Yuya Oaki, “Amorphous 2D materials containing a conjugated-polymer network”
      Communicationss Chemistry 2019,2, 97.
      This article was highlighted in Behind the Paper of Nature Research Chemistry Community.
      A new paper has been accepted for publication in Bulletin of the Chemical Society of Japan.
      This paper shows high-yield exfoliation of layered inorganic-organic composites into the nanosheets through reduction of the interlayer guest.
      Yuna Yamamoto, Hiroaki Imai, *Yuya Oaki, “Redox-Mediated High-Yield Exfoliation of Layered Composites into Nanosheets”
      Bulletin of the Chemical Society of Japan 2019,92, 779.
      This paper was highlighted as a Selected Paper in the issue.
      A new paper has been accepted for publication in Journal of Materials Chemistry C.
      This paper shows imaging and quantification of invisible NIR light using layered polydiacetylene (PDA) on a paper-based substrate with coating of polypyrrole (PPy). The photo-thermal conversion property of PPy induces the color change of PDA. This is a collaborative research with Prof. Syuji Fujii in Osaka Institute of Technology.
      Machi Takeuchi, Hisato Kawashima, Hiroaki Imai, *Syuji Fujii, *Yuya Oaki, “Quantitative detection of near-infrared (NIR) light using organic layered composites”
      Journal of Materials Chemistry C 2019,7, 4089.
      A new paper has been accepted for publication in Advanced Theory and Simulations.
      This paper shows efficient exploration of conditions for high-yield synthesis of nanosheets from layered composite materials using materials informatics combined with experimental, calculational, and data sciences. This is a collaborative research with Dr. Yasuhiko Igarashi in The University of Tokyo.
      Gentoku Nakada, Yasuhiko Igarashi, Hiroaki Imai, *Yuya Oaki, “Materials-Informatics-Assisted High-Yield Synthesis of 2D Nanomaterials through Exfoliation”
      Advanced Theory and Simulations 2019, 2, 1800180.
      This achievement was featured in newspapers (in Japanese).
  • 2018
    • A review paper has been published in Journal of Materials Chemistry A.
      This review summarizes recend advances about morphological variety of organic polymer materials and their applications.
      *Yuya Oaki, Kosuke Sato,“Crystal-controlled polymerization: Recent advances in morphology design and control of organic polymer materials”
      Journal of Materials Chemistry A 2018, 6, 23197.
      A new paper has been published in Advanced Functional Materials.
      This paper shows how the temperature-responsive color-change properties of layered polydiacetylene are tuned by intercalation of guest ions. This is a collaborative research with Prof. Nico A. J. M. Sommerdijk and his coworkers in Eindhoven University of Technology.
      Machi Takeuchi, Karthikeyan Gnanasekaran, Heiner Friedrich, Hiroaki Imai, Nico A. J. M. Sommerdijk, *Yuya Oaki, “Tunable Stimuli-Responsive Color-Change Properties of Layered Organic Composites”
      Advanced Functional Materials 2018, 18, 1804906.
      A new paper has been published in ACS Applied Nano Materials.
      Conductive-polymer nanosheets with tunable thickness and superior conductivity and electrochemical performance were prepared using a new crystal-controlled polymerization scheme.
      Kosuke Sato, Hiroaki Imai, *Yuya Oaki, “Two-Dimensional Conductive and Redox-Active Nanostructures Synthesized by Crystal-Controlled Polymerization for Electrochemical Applications”
      ACS Applied Nano Materials 2018, 1, 4218.
      Our recent work related to organic layered materials is featured on Keio Research Highlight (in English) in the website of our university.We have studied tunable stimuli-responsive color-change properties of layered organic materials and their applications to visualization and quqntitative detection of external stress. The recent intersting results are summarized in the following website.
      https://research-highlights.keio.ac.jp/2018/06/b.html
      A new paper has been published in Advanced Materials.
      Hideto Terada, Hiroaki Imai, *Yuya Oaki, “Visualization and Quantitative Detection of Friction Force by Self-Organized Organic Layered Composites”
      Advanced Materials 2018, 30, 1801121.
      A new paper has been published in NPG Asis Materials.
      Hiromichi Numazawa, Kosuke Sato, Hiroaki Imai, *Yuya Oaki, “Multistage Redox Reaction of Conductive-Polymer Nanostructures with Lithium Ion: Potentials for High-Performance Organic Anode”
      NPG Asia Materials 2018, 10, 397.

Contact

Department of Applied Chemistry,
Faculty of Science and Technology,
3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522

Tel:+81-45-566-1838
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