緒明佑哉

Ph. D. Yuya Oaki
Associate Professor
Department of Applied Chemistry
Faculty of Science and Technology
Keio University

ORCID iD: 0000-0001-7387-923

Research work
Biography
Selected publication
Selected awards
Japanese

What's new


New
A new paper is 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.

New
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.

New
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.

New
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.

New
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 The 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.

New
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 Tsukuba University 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.

New
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.

New
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.

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. Shuji 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).

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.


Research work

Soft Two-Dimensional Polymer Materials and Their Applications
(1) Nanoscale morphology control of conjugated polymer materials and their energy-related applications
(2) Organic layered materials with tunable stimuli-responsive color-change properties and their applications to visualization and quantification of external stimuli
(3) Nanosheet materials derived from soft layered organic/inorganic composites
(4) Experiment-oriented materials informatics on small-scale data
Our group focus on synthesis and structure control of 2D organic and inorganic polymer materials with characteristic structures, such as layered and nanosheet materials. These functional polymer materials are applied to energy- and environment-related applications. Small-data materials informatics combined with data scientific method and chemical perspective is studied to realize efficient exploration of advanced functional materials.



See the more detailed concepts in review papers:
“Morphology Design of Crystalline and Polymer Materials from Nanoscopic to Macroscopic Scales”
Bull. Chem. Soc. Jpn. 2017, 90, 776 (Award Account).
“Crystal-controlled polymerization: Recent advances in morphology design and control of organic polymer materials”
Journal of Materials Chemistry A 2018, 6, 23197.


(1) Morphology control of conjugated polymer materials from nanoscopic to macroscopic scales and their application to energy-related functional materials


 Our group has studied morphology control of polymer materials, such as two-dimensional (2D) nanostructures and hierarchical structures from nanoscale to macroscopic scales. A variety of methods to control the nanostructures, such as application of templates and phase separations, were studied in previous works. We have developed new unique approaches for morphology control, such as application of crystal surfaces and morphologies, use of monomer vapor, and composite formation with the other materials, distinguished from typical methods (See the images). The resultant polymers were used for energy-related applications, such as energy storage and electrocatalyst.

 The hierarchical structures of crystalline materials were replicated to polymer materials through polymerization in the nanoscale interspace of the original crystals.[1-8] For example, the hierarchical polypyrrole and polystyrene had both the nanoscale structures with high specific surface area and micrometer-scale pathway. These polymers showed the improved performances as to energy-storage and adsorbent.[8-10]

 A variety of heteroaromatic monomers were polymerized with organic and inorganic oxidants.[9-14,16-18] For example, when volatile heteroaromatic monomer is set in a closed vessel with certain inorganic oxidative agent, the heteroaromatic polymers, such as polypyrrole and polythiophene derivatives, are coated on substrates and substances in the vessel.[4,14,17] This vapor-phase coating of conductive polymers is achieved at low temperature under ambient pressure. When quinone derivatives are used as the oxidants, conductive polymer with a variety of morphologies are obtained on the surface of the quinone crystals. Moreover, the composites of quinone derivatives and conductive polymers showed the high specific capacity originating from the redox reactions of the both active materials.[10,11,13] In specific cases, the random copolymer of quinone and heteroaromatic polymer forms the graphitic layers.[17] The exfoliated nanosheets showed the enhanced electrocatalytic performances as hydrogen evolution reaction.



Related publications
 [1] J. Am. Chem. Soc. 2011, 133, 8594.
 [2] J. Mater. Chem. 2012, 22, 21195.
 [3] Chem. Eur. J. 2013, 19, 2284.
 [4] Chem. Commun. 2014, 50, 11840.
 [5] Polym. J. 2014
 [6] Langmuir 2014, 30, 3236.
 [7] Nanoscale 2015, 7, 3466.
 [8] Chem. Commun. 2015, 51, 7919.
 [9] Chem. Commun. 2015, 51, 9698.
 [10] Chem. Lett. 2016, 45, 324.
 [11] ChemPlusChem 2017, 82, 177.
 [12] NPG Asia Mater. 2017, 9, e377.
 [13] Chem. Commun. 2017, 53, 7329.
 [14] Nanoscale 2017, 9, 7895.
 [15] NPG Asia Mater. 2018, 10, 397.
 [16] ACS Appl. Nano Mater. 2018, 1, 4218.
 [17] Commun. Chem. 2019, 2, 97.
 [18] Adv. Theory Simul. 2019, 2, 1900130.
 [19] Chem.Sci. 2020, 11, 7003.

Accounts
 [1] Bull. Chem. Soc. Jpn. 2017, 90, 776.
 [2] J. Mater. Chem. A 2018, 6, 23197.


(2) Organic layered materials with tunable stimuli-responsive color-change properties

 In general, layered materials represent inorganic layered compounds. Our group has focused on organic layered materials, such as layered polydiacetylene (PDA). Organic layered materials have intercalation nature, soft structure, and dynamic function. We studied the morphology and orientation control of such organic crystals on substrates.[1-3] The intercalation affords to control the layered structures and their dynamic functions.[4-11] The stimuli-responsive color-change properties of layered PDA were tuned by the types of the intercalated guests. Our intention is to visualize and quantify a variety of external stimuli, such as heat, light, and force. For example, 2D and 3D temperature distributions were visualized and quantified by the PDA-based paper device.[6,13] Moreover, friction force was visualized and quantified by this device.[10,14] If the stimuli is not directly detected by PDA, the stimuli conversion can induce the color changes.[12,15] NIR and microwave were visualized and quantified by the composite device of PDA and other polymers.[12,15] Our motivation is visualization and quantification of a variety of external stimuli.



Related publications
 [1] J. Mater. Chem. 2012, 22, 22686.
 [2] Bull. Chem. Soc. Jpn. 2015, 88, 1459.
 [3] Chem. Mater. 2015, 27, 2627.
 [4] Adv. Funct. Mater. 2016, 26, 3463.
 [5] Chem. Sci. 2017, 8, 647.
 [6] ACS Appl. Mater. Interfaces 2017, 9, 16546.
 [7] Chem 2017, 3, 509.
 [8] J. Mater. Chem. C 2017, 5, 8250.
 [9] Polym. J. 2018, 50, 319.
 [10] Adv. Mater. 2018, 30, 1801121.
 [11] Adv. Funct. Mater. 2018, 28, 1804906.
 [12] J. Mater. Chem. C 2019, 7, 4089.
 [13] Chem. Commun. 2019, 55, 11723.
 [14] J. Mater. Chem. C 2020, 8, 1265.
 [15] ACS Sensors 2020, 5, 11723.
 [16] Small 2020,16, 2004586.

Account
 [1] Chem. Commun. 2020, 56, 13069.


(3) Structure design and synthesis of inorganic nanosheet materials
 Recently, 2D nanomaterials have attracted much interest. Our group focuses on layered transition metal oxides and their exfoliation into the nanosheets. In general, exfoliation of these rigid layered compounds is performed in aqueous and polar organic media. We also study the size control of the nanosheets.[1-3] However, It is not easy to control the size and surface chemistry. We found that new exfoliation methods using soft layered composite materials.[4-12] The layered composites of the host layers and guest molecules are exfoliated into the surface-modified nanosheets in a variety of media. The affinity between the guest and medium plays important roles for the exfoliation process. Recently, we found that materials informatics is a powerful tool for the improvement of the yield and control of the size.[11]



Related publications
 [1] Adv. Funct. Mater. 2010, 20, 4127.
 [2] Chem. Eur. J. 2012, 18, 2825.
 [3] J. Am. Chem. Soc. 2013, 135, 4501.
 [4] Chem. Mater. 2014, 26, 3579.
 [5] Chem. Commun. 2015, 51, 10046.
 [6] Phys. Chem. Chem. Phys. 2015, 17, 32498.
 [7] Nanoscale 2016, 8, 11076.
 [8] Chem. Commun. 2016, 52, 9466.
 [9] Adv. Mater. Interface 2017, 4, 1601014.
 [10] Chem. Commun. 2018, 54, 244.
 [11] Adv. Theory Simul. 2019, 2, 1800180.
 [12] Bull. Chem. Soc. Jpn. 2019, 92, 779.
 [13] Nanoscale Adv. 2020, 2, 1168.
 [14] Adv. Theory Simul. 2020, 3, 2000084.

Account]
 [1] Chem. Lett. 2020, DOI: 10.1246/cl.2007471.





Biography


Associate Professor (April 2016 – current)
Department of Applied Chemistry
Faculty of Science and Technology, Keio University

*PRESTO Researcher (October 2016– March 2020)
(*A selected project researcher of Precursory Research for Embryonic Science and Technology)
Japan Science and Technology Agency, Japan

Junior Associate Professor (April 2012 – March 2016)
Department of Applied Chemistry
Faculty of Science and Technology, Keio University

Assistant Professor (April 2009 – March 2012)
Department of Applied Chemistry
Faculty of Science and Technology, Keio University

Postdoctoral Researcher
Research Fellowship for Young Scientists (PD) (April 2007 – March 2009)
Funded by Japan Society for the Promotion of Science (JSPS)
Department of Chemistry and Biotechnology
Graduate School of Engineering
The University of Tokyo

Ph. D. (April 2004 – March 2006)*
Graduate School of Science and Technology, Keio University

M. S. (April 2002 – March 2004)
Graduate School of Science and Technology, Keio University

B. S. (April 1998 – March 2002)
Department of Applied Chemistry
Faculty of Science and Technology, Keio University


Selected publication

(68) *Yuya Oaki, “Exfoliation Chemistry of Soft Layered Materials toward Tailored 2D Materials”
Chemistry Letters 2020, DOI: 10.1246/cl.2007471.

(67) *Yuya Oaki, “Intercalation and Flexibility Chemistries of Soft Layered Materials”
Chemical Communications 2020,56, 13069-13081.

(66) Kei Watanabe, Hiroaki Imai, *Yuya Oaki, “Solid-State Low-Temperature Thermoresponsive and Reversible Color Changes of Conjugated Polymer in Layered Structure”
Small 2020, 16, 2004586.

(65) 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.

(64) 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.

(63) Ryosuke Mizuguchi, Hiroaki Imai, *Yuya Oaki, “Formation processes, size changes, and properties of nanosheets derived from exfoliation of soft layered inorganic–organic composites”
Nanoscale Advances 2020, 2, 1168-1176.

(62) Minami Nakamitsu, Hiroaki Imai, *Yuya Oaki, “Visualization and Quantification of Microwave using Thermo-Responsive Color-Change Hydrogel”
ACS Sensors 2020, 5, 133.

(61) 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.

(60) 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.

(59) 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.

(58) Shohei Yano, Kosuke Sato, Jumpei Suzuki, Hiroaki Imai, *Yuya Oaki, “Amorphous 2D materials containing a conjugated polymer network”
Communications Chemistry 2019, 2, 97.

(57) Machi Takeuchi, Hisato Kawashima, Hiroaki Imai, *Shuji Fujii, *Yuya Oaki, “Quantitative detection of near-infrared (NIR) light using organic layered composites”
Journal of Materials Chemistry C 2019, 7, 4089-4095.

(56) 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, 779-784.

(55) 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.

(54) *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, 23197-23219.

(53) 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.

(52) 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, 4218-4226.

(51) 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, 397-405.

(50) Hideto Terada, Hiroaki Imai, *Yuya Oaki, “Visualization and Quantitative Detection of Friction Force by Self-Organized Organic Layered Composites”
Advanced Materials 2018, 30, 1801121.

(49) *Yuya Oaki, Yukiko Ishijima, Hiroaki Imai, “Emergence of temperature-dependent and reversible color-changing properties by the stabilization of layered polydiacetylene through intercalation”
Polymer Journal 2018, 50, 319–326.

(48) Gentoku Nakada, Hiroaki Imai,*Yuya Oaki, “Few-layered titanate nanosheets with large lateral size and surface functionalization: potential for the controlled exfoliation of inorganic–organic layered composites”
Chemical Communications 2018, 52, 224-227.

(47) Yukiko Ishijima, Hiroaki Imai, *Yuya Oaki, “Tunable Mechano-responsive Color-Change Properties of Organic Layered Material by Intercalation”
Chem 2017, 3, 509–521.

(46) Machi Takeuchi, Hiroaki Imai, *Yuya Oaki, “Effects of intercalation rate on layered crystal structures and stimuli-responsive color-change properties of polydiacetylene”
Journal of Materials Chemistry C 2017, 5, 8250–8255.

(45) *Yuya Oaki, “Morphology Design of Crystalline and Polymer Materials from Nanoscopic to Macroscopic Scales”
Bulletin of the Chemical Society of Japan 2017, 90, 776 (award account).

(44) Kosuke Sato, Mirei Arayasu, Hirotaka Masaki, Hiroaki Imai, *Yuya Oaki,“Hierarchical bicontinuous structure of redox-active organic composites and their enhanced electrochemical properties”
Chemical Communications 2017, 53, 7329 (Emerging Investigator Issue 2017).

(43) Machi Takeuchi, Hiroaki Imai, *Yuya Oaki,“Real-Time Imaging of 2D and 3D Temperature Distribution: Coating of Metal-Ion-Intercalated Organic Layered Composites with Tunable Stimuli-Responsive Properties”
ACS Applied Materials & Interfaces 2017, 9, 16546–16552.

(42) K. Kuwabara, H. Masaki, Hiroaki Imai,*Yuya Oaki,“Substrate coating by conductive polymers through spontaneous oxidation and polymerization”
Nanoscale 2017, 9, 7895–7900.

(41) Yuna Yamamoto, *Yuya Oaki, Hiroaki Imai, “Coupled Exfoliation and Surface Functionalization of Titanate Monolayer for Bandgap Engineering”
Advanced Materials Interface 2017, 4, 1601014 (8 pages).

(40) Kosuke Sato, *Yuya Oaki, Hiroaki Imai, “Phase separation of composite materials through simultaneous polymerization and crystallization”
NPG Asia Materials 2017, 9, e377 (7 pages).

(39) Kosuke Sato, Hirotaka Masaki, Mirei Arayasu, *Yuya Oaki, Hiroaki Imai, “Conductive Polymer Nanosheets Generated from the Crystal Surface of an Organic Oxidant”
ChemPlusChem 2017, 82, 177(Invited to Early Carrier Series).

(38) Yukiko Ishijima, Mamoru Okaniwa, *Yuya Oaki, Hiroaki Imai, “Two exfoliation approaches for organic layered compounds: hydrophilic and hydrophobic polydiacetylene nanosheets”
Chemical Science 2017, 8, 647.

(37) Hiroshi Matsui, *Yuya Oaki, Hiroaki Imai, “Surface-functionalized hydrophilic monolayer of titanate and its application for dopamine detection”
Chemical Communications 2016, 52, 9466.

(36) Hiroshi Matsui, *Yuya Oaki, Hiroaki Imai, “Tunable photochemical properties of a covalently anchored and spatially confined organic polymer in a layered compound”
Nanoscale 2016, 8, 11076.

(35) Mamoru Okaniwa, *Yuya Oaki, Hiroaki Imai, “Intercalation-Induced Tunable Stimuli-Responsive Color-Change Properties of Crystalline Organic Layered Compound”
Advanced Functional Materials 2016, 26, 3463.

(34) Kosuke Sato, *Yuya Oaki, Hiroaki Imai, “Incorporation of Redox-Active Guest in Conductive and Redox-Active Host: Hierarchically Structured Composite of a Conductive Polymer and Quinone Derivative”
Chemistry Letters 2016, 45, 324.

(33) Masashi Honda, *Yuya Oaki, *Hiroaki Imai, “Surface-functionalized monolayered nanodots of a transition metal oxide and their properties”
Physical Chemistry Chemical Physics 2015, 17, 32498.

(32) Mamoru Okaniwa, *Yuya Oaki, *Hiroaki Imai, “Morphology and Orientation Control of Organic Crystals in Organic Media through Advanced Biomimetic Approach”
Bulletin of the Chemical Society of Japan 2015, 88, 1459.

(31) Masashi Honda, *Yuya Oaki, *Hiroaki Imai, “Hydrophobic monolayered nanoflakes of tungsten oxide: Coupled exfoliation and fracture in a nonpolar organic medium”
Chemical Communications 2015, 51, 10046.

(30) Kento Kuwabara, *Yuya Oaki, Ryo Muramatsu, *Hiroaki Imai, “Crystal-surface-induced simultaneous synthesis and hierarchical morphogenesis of conductive polymers”
Chemical Communications 2015, 51, 9698.

(29) Mamoru Okaniwa, *Yuya Oaki, Soichiro Kaneko, Kazuki Ishida, Hideyuki Maki, *Hiroaki Imai, “Advanced Biomimetic Approach for Crystal Growth in Nonaqueous Media: Morphology and Orientation Control of Pentacosadiynoic Acid and Applications”
Chemistry of Materials 2015, 27, 2627.

(28) Kosuke Sato, *Yuya Oaki, *Hiroaki Imai, “A Hydrophobic Adsorbent Based on Hierarchical Porous Polymers Derived from Morphologies of a Biomineral”
Chemical Communications 2015, 51, 7919.

(27) Kosuke Sato, *Yuya Oaki, Daisuke Takahashi, Kazunobu Toshima, *Hiroaki Imai, “Hierarchical CaCO3 Chromatography: A Stationary Phase Based on Biominerals”
Chemistry–A European Journal 2015, 21, 5034.

(26) Yurika Munekawa, *Yuya Oaki, Kosuke Sato and *Hiroaki Imai, “Incorporation of Organic Crystals in the Interspace of Oriented Nanocrystals: Morphologies and Properties”
Nanoscale 2015, 7, 3466. [Selected for Cover Picture]

(25) Ryo Muramatsu, *Yuya Oaki, Kento Kuwabara, Kosei Hayashi, *Hiroaki Imai, “Solvent-free synthesis, coating and morphogenesis of conductive polymer materials through spontaneous generation of the activated monomers”
Chemical Communications 2014, 50, 11840.

(24) Masashi Honda, *Yuya Oaki, *Hiroaki Imai, “Hydrophobic Inorganic-Organic Composite Nanosheets Based on Monolayers of Transition Metal Oxides”
Chemistry of Materials 2014, 26, 3579.

(23) Yurika Munekawa, *Yuya Oaki, *Hiroaki Imai, “An Experimental Study on the Processes of Hierarchical Morphology Replication by Means of a Mesocrystal: A Case Study of poly(3,4-ethylenedioxythiophene)”
Langmuir 2014, 30, 3236.

(22) Tatsuya Ikeda, *Yuya Oaki, *Hiroaki Imai, “Thin Film Consisting of CuO Mesocrystal Nanosheets: An Application of Microbial-Mineralization-Inspired Approaches to Thin-Film Formation”
Chemistry–An Asian Journal 2013, 8, 2064.

(21)*Yuya Oaki, Tatsuya Ikeda, Hiroaki Imai, “A Microbial-Mineralization-Inspired Approach for Systematic Syntheses of Copper Oxides with Controlled Morphologies in an Aqueous Solution at Room Temperature”
Bulletin of the Chemical Society of Japan 2013, 86, 821. [Selected Paper]

(20) Naoki Yagita, *Yuya Oaki, *Hiroaki Imai, “A Microbial-Mineralization Approach for Syntheses of Iron Oxides with a High Specific Surface Area”
Chemistry–A European Journal 2013, 19, 4419.

(19) Keisuke Nakamura, *Yuya Oaki, *Hiroaki Imai, “Monolayered Nanodots of Transition Metal Oxides”
Journal of the American Chemical Society 2013, 135, 4501.

(18) Misako Kijima, *Yuya Oaki, Yurika Munekawa, *Hiroaki Imai, “Synthesis and Morphogenesis of Organic and Inorganic Polymers by Means of Biominerals and Biomimetic Materials”
Chemistry–A European Journal 2013, 19, 2284. [Selected for the Picture on Backcover]

(17) *Yuya Oakii, Takahiro Oki, *Hiroaki Imai, “Enhanced photoconductive properties on a simple composite coaxial nanostructure of zinc oxide and polypyrrole”
Journal of Materials Chemistry 2012, 22, 21195.

(16) *Yuya Oaki, Naoki Yagita, *Hiroaki Imai, “One-Pot Aqueous Solution Syntheses of Iron Oxides Nanostructures with Controlled Crystal Phases through a Microbial-Mineralization-Inspired Approach”
Chemistry–A European Journal 2012, 18, 110. [Selected for Cover Picture]

(15) *Yuya Oaki, Keisuke Nakamura, *Hiroaki Imai, “Homogeneous and Disordered Assembly of Densely-Packed Titanium-Oxides Nanocrystals: An Approach to Coupled Synthesis and Assembly in an Aqueous Solution”
Chemistry–A European Journal 2012, 18, 2825. [Selected for Cover Picture]

(14) *Yuya Oaki, Misako Kijima, *Hiroaki Imai, “Synthesis and Morphogenesis of Organic Polymer Materials with Hierarchical Structures in Biominerals”
Journal of the American Chemical Society 2011, 133, 8594.

(13) Yuya Oaki, Hiroyuki Ohno, *Takashi Kato, “Nanosegregated Composites of an Imidazolium Salt and a Layered Inorganic Compound: Organization of Both Anions and Cations in Interlayer Space”
Nanoscale 2010, 2, 2362.

(12) *Yuya Oaki, Takeo Anzai, *Hiroaki Imai, “Homogeneous and Disordered Assembly of Densely-Packed Nanocrystals”
Advanced Functional Materials 2010, 20, 4127.

(11) Manabu Oba, Yuya Oaki, *Hiroaki Imai, “A Microbial-Mineralization-Inspired Approach for Synthesis of Manganese Oxide Nanostructures with Controlled Oxidation States and Morphologies”
Advanced Functional Materials 2010, 20, 4279.

(10) Yuya Oaki, *Hiroaki Imai, “Photochemical Reactions in Nanoscopic Organic Domains Generated from Oriented Crystals with Polymers: Nanocrystalline Mosaics as a New Family of Host Materials”
Bulletin of the Chemical Society of Japan 2009, 82, 613.

(9) Yuya Oaki, Satoshi Kajiyama, Tatsuya Nishimura, Hiroaki Imai, *Takashi Kato, “Nanosegregated Amorphous Composites of Calcium Carbonate and an Organic Polymer”
Advanced Materials 2008, 20, 3633.

(8) Yuya Oaki, Satoshi Kajiyama, Tatsuya Nishimura, *Takashi Kato, “Selective Synthesis and Thin-Film Formation of alpha-Cobalt Hydroxide through an Approach Inspired by Biomineralization”
Journal of Materials Chemistry 2008, 18, 4140.

(7) Yuya Oaki, *Hiroaki Imai, “One-Pot Synthesis of Manganese Oxide Nanosheets in an Aqueous Solution: Chelation-Mediated Parallel Control of Reaction and Morphology”
Angewandte Chemie International Edition 2007, 46, 4951.

(6) Yuya Oaki, Akiko Kotachi, Takashi Miura, *Hiroaki Imai, “Bridged-Nanocrystals in Biominerals and Its Mimetics: Classical Yet Modern Crystal Growth in Nanoscale”
Advanced Functional Materials 2006, 16, 1633.

(5) Yuya Oaki, *Hiroaki Imai, “Hierarchically Organized Architecture of Potassium Hydrogen Phthalate and Poly(Acrylic Acid): Toward A General Strategy for Biomimetic Crystal Design”
Chemical Communications 2005, 6011.

(4) Yuya Oaki, *Hiroaki Imai, “Nanoengineering in Echinoderms: Emergence of Morphology from Nanobricks”
Small 2006, 2, 66.

(3) Yuya Oaki, *Hiroaki Imai, “Hierarchically Organized Superstructure Emerging from Exquisite Association of Inorganic Crystals, Organic Polymers, and Dyes: A Model Approach toward Suprabiomineral Material”
Advanced Functional Materials 2005, 15, 1407. [Selected for Cover Picture]

(2) Yuya Oaki, *Hiroaki Imai, “The Hierarchical Architecture of Nacre and Its Mimetic Material”
Angewandte Chemie International Edition 2005, 44, 6571.

(1) Yuya Oaki, *Hiroaki Imai, ‘‘Amplification of Chirality from Molecules into Morphology of Crystals through Molecular Recognition’
Journal of the American Chemical Society 2004, 126, 9271.



Selected awards

The Young Scientists’ Prize, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology (April 2018)

The Chemical Society of Japan Award For Young Chemists for 2015 (March 2016)