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

What's new


New
A new paper has been acceted for publication in NPG Asia 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,in press.

New
A new paper has been accepted for publication 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,in press.


Research work

Morphology control of organic and inorganic polymer materials and their function exploration
(1) Morphology control of conjugated polymer materials from nanoscopic to macroscopic scales and their application to energy-related functional materials
(2) Organic layered materials with tunable stimuli-responsive color-change properties
(3) Structure design and synthesis of inorganic nanosheet materials

Our group focuses on design, synthesis, morphology control, and composite formation of organic and inorganic polymer materials. The three main target materials are conjugated polymers, redox-active organic materials, and inorganic and organic layered compounds and their exfoliated nanosheets. Although these materials are generally not in the same category for research work, we believe the presence of the same underlying strategies for structure control and function exploration. In general, molecular design and synthesis in molecular level and nanometer scale is a main stream for development of organic materials. Our group focuses on structure and morphology control from nanometer to macroscopic scales, distinguished from typical molecular design and synthesis. A variety of the control strategies are developed in recent works. Structure and morphology control from nanometer to macroscopic scales have significant impact on properties and functions of polymer materials. These unique strategies facilitates enhancement of the properties and emergence of functions in charge-storage, sensing, and stimuli-responsive applications. See the more detailed concepts in review paper: “Morphology Design of Crystalline and Polymer Materials from Nanoscopic to Macroscopic Scales” Bull. Chem. Soc. Jpn. 2017, 90, 776-788 (Award Account).




(1) Morphology control of conjugated polymer materials from nanoscopic to macroscopic scales and their application to energy-related functional materials
  Our group has studied how to control morphologies of conjugated polymer materials from nanoscopic to macroscopic scales. In general, it is not easy to control the morphologies because of the low solubility and processability. Simultaneous synthesis and morphology control are required for morphology design of rigid conjugated polymers. Our group has developed a variety of approaches for morphology control, coating, and composite formation. The resultant polymers were used for energy-related applications, such as charge storage.


Related publications
 J. Am. Chem. Soc. 2011, 133, 8594.
 J. Mater. Chem. 2012, 22, 21195.
 Chem. Eur. J. 2013, 19, 2284.
 Chem. Commun. 2014, 50, 11840.
 Polym. J. 2014
 Langmuir 2014, 30, 3236.
 Nanoscale 2015, 7, 3466.
 Chem. Commun. 2015, 51, 7919.
 Chem. Commun. 2015, 51, 9698.
 Chem. Lett. 2016, 45, 324.
 ChemPlusChem 2017, 82, 177.
 NPG Asia Mater. 2017, 9, e377.
 Chem. Commun. 2017, 53, 7329.
 Nanoscale 2017, 9, 7895.
 NPG Asia Mater. 2018, in press.



(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 found that the intercalation can control the layered structures and their dynamic functions. The stimuli-responsive color-change properties of layered PDA were tuned by the types of the intercalated guests. Our intention is the unique applications of organic layered materials based on the characteristic structures and properties.



Related publications
 J. Mater. Chem. 2012, 22, 22686.
 Bull. Chem. Soc. Jpn. 2015, 88, 1459.
 Chem. Mater. 2015, 27, 2627.
 Adv. Funct. Mater. 2016, 26, 3463.
 Chem. Sci. 2017, 8, 647.
 ACS Appl. Mater. Interfaces 2017, 9, 16546.
 Chem 2017, 3, 509.
 J. Mater. Chem. C 2017, 5, 8250.
 Polym. J. 2018, 50, 319.
 Adv. Mater. 2018, in press.



(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, the exfoliation is performed in aqueous and polar organic media. It is not easy to control the size and surface chemistry. We found that new exfoliation methods using layered composite materials. The layered composites containing 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. We explore the new exfoliation methods.



Related publications
 Adv. Funct. Mater. 2010, 20, 4127.
 Chem. Eur. J. 2012, 18, 2825.
 J. Am. Chem. Soc. 2013, 135, 4501.
 Chem. Mater. 2014, 26, 3579.
 Chem. Commun. 2015, 51, 10046.
 Phys. Chem. Chem. Phys. 2015, 17, 32498.
 Nanoscale 2016, 8, 11076.
 Chem. Commun. 2016, 52, 9466.
 Adv. Mater. Interface 2017, 4, 1601014.
 Chem. Commun. 2018, 54, 244.


Biography


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

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

Junior Associate Professor (April 2012 – March 2016t)
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

(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,in press.

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

(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.

(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 (受賞総説).

(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)