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
- 2021
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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, in press (DOI: 10.1039/D1CC01440D).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, accepted for publication.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, accepted for publication.
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- 2020
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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.
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- 2019
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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).
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- 2018
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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.htmlA 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.
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