論文 - 今井　宏明

Few-layered titanate nanosheets with large lateral size and surface functionalization: Potential for the controlled exfoliation of inorganic-organic layered composites

今井 宏明

Chemical Communications （Chemical Communications）  54 （ 3 ） 244 - 247 2018年01月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  13597345

　概要を見る

Herein, few-layered titanate nanosheets with a large lateral size and surface functionalization were synthesized via the exfoliation of precursor layered composites in an organic medium. The combination of layered compounds, intercalated guests, and dispersion media has the potential for the synthesis of nanosheets with controlled lateral sizes, thicknesses, and surface chemistry through exfoliation.

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Emergence of temperature-dependent and reversible color-changing properties by the stabilization of layered polydiacetylene through intercalation

今井 宏明

Polymer Journal （Polymer Journal）  50 （ 4 ） 319 - 326 2018年01月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  00323896

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The stimuli-responsive color-changing properties of functional polymers are applied to the development of sensing and imaging devices. Tuning the stimuli responsivity is required for a wide range of applications. Polydiacetylene (PDA) derivatives show color changes with the application of external stimuli, such as heat and mechanical stress. Our group has focused on the layered crystal structure of PDA and its intercalation chemistry. The original layered PDA shows an irreversible color transition from blue to red upon heating to the threshold temperature. Here, we found that alkyldiamine-intercalated PDA possessed different color-changing properties, such as a higher color transition temperature and a temperature-dependent and reversible color change, than the original PDA. As the alkyl-chain length increased, the color-changing behavior gradually converted from the irreversible color transition type to the reversible temperature-dependent one. Since the intercalated diamine had a stabilizing effect on the layered structure, the stimuli responsivity varied according to the type of diamine. The results suggest that the stimuli-responsive color-changing properties of layered PDA can be finely and systematically tuned by the intercalation of organic guests.

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Evolution of Calcite Nanocrystals through Oriented Attachment and Fragmentation: Multi-Step Pathway Involving Bottom-Up and Break-Down Stages

今井 宏明

ACS Omega 2   8997 - 9001 2017年12月

研究論文（学術雑誌）, 共著, 査読有り

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Spatial Control of Crystallographic Direction in 2D Microarrays of Anisotropic Nanoblocks on Trenched Substrates

今井 宏明

R. Matsumoto, Y. Nakagawa, K. Kato, Y. Oaki, H. Imai （Langmuir）  33   13805 - 13810 2017年12月

研究論文（学術雑誌）, 共著, 査読有り

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Hierarchical Textures on Aragonitic Shells of a Hyaline Radial Foraminifer Hoeglundina elegans

今井 宏明

CrystEngComm 19   7191 - 7196 2017年11月

研究論文（学術雑誌）, 共著, 査読有り

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Enhanced quantum yield of fluorophores in confined spaces of supermicroporous silicas

今井 宏明

Bulletin of the Chemical Society of Japan （Bulletin of the Chemical Society of Japan）  91 （ 1 ） 87 - 91 2017年10月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  00092673

　概要を見る

The optical properties of polycyclic aromatic hydrocarbon fluorophores, such as pyrene and perylene, are controlled by confined spaces of meso- and supermicropores in a silica matrix. The quantum yield of fluorescence from monodispersed pyrene and perylene increases with limitation of the excimer formation in 1 nm supermicropores. When the pore diameter is close to the molecular size, solid-state fluorescence having a high quantum yield is achieved via the fluorophores in the confined spaces by suppressing the aggregation, the interaction with charge-transfer sites and the stabilization of the excited state.

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Polymer-Assisted Shapeable Synthesis of Porous Frameworks Consisting of Silica Nanoparticles with Mechanical Property Tuning

今井 宏明

Polymer Journal 49   825 - 830 2017年10月

研究論文（学術雑誌）, 共著, 査読有り

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Ultrasensitive Detection of Methylmercaptan Gas Using Layered Manganese Oxide Nanosheets with a Quartz Crystal Microbalance Sensor

今井 宏明

Analytical Chemistry 89   12123 - 12130 2017年10月

研究論文（学術雑誌）, 共著, 査読有り

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Two exfoliation approaches for organic layered compounds: hydrophilic and hydrophobic polydiacetylene nanosheets

今井 宏明

Chemical Science 8   647 - 653 2017年08月

研究論文（学術雑誌）, 共著, 査読有り

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Effects of intercalation rate on layered crystal structures and stimuli-responsive color-change properties of polydiacetylene

今井 宏明

Journal of Materials Chemistry C 5   8250 - 8255 2017年07月

研究論文（学術雑誌）, 共著, 査読有り

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Evolution analysis of V2O5·nH2O gels for preparation of xerogels having a high specific surface area and their replicas

今井 宏明

RSC Advances 7   35711 - 35716 2017年07月

研究論文（学術雑誌）, 共著, 査読有り

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Dispersion of Hydroxyapatite Nanocrystals Stabilized by Polymeric Molecules Bearing Carboxy and SulfoGroups

今井 宏明

Colloid and Polymer Science 295   1491 - 1498 2017年06月

研究論文（学術雑誌）, 共著, 査読有り

Tunable Mechano-responsive Color-Change Properties of Organic Layered Material by Intercalation

今井 宏明

Chem 3   509 - 521 2017年05月

研究論文（学術雑誌）, 共著, 査読有り

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Hierarchical bicontinuous structure of redox-active organic composites and their enhanced electrochemical properties

今井 宏明

Chemical Communications 53   7329 - 7332 2017年05月

研究論文（学術雑誌）, 共著, 査読有り

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Self-organized Formation of Parallel-banded Structures through Synchronization of Twisted Growth

今井 宏明

Crystal Growth and Design 17   3694 - 3699 2017年05月

研究論文（学術雑誌）, 共著, 査読有り

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Coupled Exfoliation and Surface Functionalization of Titanate Monolayer for Bandgap Engineering

今井 宏明

Advanced Materials Interface 4 （ 7 ） 1601014 2017年04月

研究論文（学術雑誌）, 共著, 査読有り

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Real-Time Imaging of 2D and 3D Temperature Distribution: Coating of Metal-Ion-Intercalated Organic Layered Composites with Tunable Stimuli-Responsive Properties

今井 宏明

ACS Applied Materials and Interfaces 9   16546 - 16552 2017年04月

研究論文（学術雑誌）, 共著, 査読有り

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Synthesis of dispersible nanosheets based on monolayer clays with imidazolium and ammonium ations aving long-chain alkyl groups

今井 宏明

Journal of the Ceramics Society of Japan 125 （ 4 ） 353 - 356 2017年04月

研究論文（学術雑誌）, 共著, 査読有り

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Phase separation through simultaneous polymerization and crystallization for composite materials, Asian Materials

今井 宏明

MPG Asia Materials 9   e377 2017年04月

研究論文（学術雑誌）, 共著, 査読有り

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Synthesis of poly(amidoamine) dendrimer having a 1,10-bis(decyloxy)decane core and its use in fabrication of carbon nanotubes/calcium carbonate hybrids through biomimetic mineralization

今井 宏明

Canadian Journal of Chemistry    935 - 941 2017年04月

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