A5028786402- Polydiacetylene-based materials and applications
- Fuel Cells and Related Materials
- Radiation Therapy and Dosimetry
- Photochromic and Fluorescence Chemistry
- Luminescence and Fluorescent Materials
- Particle accelerators and beam dynamics
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Battery Materials and Technologies
- Surfactants and Colloidal Systems
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Polymer Synthesis and Characterization
- Atomic and Molecular Physics
- Conducting polymers and applications
- Semiconductor Lasers and Optical Devices
- Mass Spectrometry Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Ion-surface interactions and analysis
- Electrocatalysts for Energy Conversion
- Radiation Effects in Electronics
- Integrated Circuits and Semiconductor Failure Analysis
- Advancements in Solid Oxide Fuel Cells
- Ultrasonics and Acoustic Wave Propagation
- Photonic and Optical Devices
Sumitomo Heavy Industries (Japan)
2019-2024
Kansai Photon Science Institute
2023
National Institutes for Quantum Science and Technology
2023
Kyoto University
2014-2017
Mie University
2002-2015
Nomura Research Institute
2009
Kyushu University
2004
Osaka University
1993-2004
Nara University of Education
2004
Sekisui Chemical (Japan)
1999-2003
Polymer electrolyte membrane fuel cells (PEMFCs) have been recently investigated extensively as a key technology to solve global energy and environmental problem by their higher conversion efficiency compared internal combustion engines. The is basic element in PEMFC, however, the polymer membrane, typically such Nafion, usually suffers from degradation at temperature, resulting narrow operational temperature windows below 100°C. If there an alternative with high stability sufficient...
The difference in the crystal-packing mode of a monomer can significantly affect its polymerization reactivity. Synthesis 7,7,8,8-tetrakis(methoxycarbonyl)quinodimethane (1) afforded two polymorphs: prisms (1 a), and needles b). former, 1 a, polymerized topochemically under thermal photopolymerization (see scheme) but b did not.
Intermediate temperature operation of polymer electrolyte fuel cells has been pointed out to be a promising option overcome most the technological problems current PEM system and new classes membrane have investigated elsewhere. Proton conducting organic/inorganic nano-hybrid membranes synthesized in present work. The were by bridging tolerant polyether polymers such as PEO or PTMO inorganic silicate moieties form hybrid macromolecules. become proton electrolytes doping with heteropolyacids...
Highly conjugated monomers, 7,7,8,8-tetrakis(alkoxycarbonyl)quinodimethanes (methoxy (1a), ethoxy (1b), isopropoxy (1c), benzyloxy (1d), chloroethoxy (1e), and bromoethoxy (1f)), were synthesized. Recrystallizations of 1a, 1c, 1e, 1f yielded two crystal forms (prisms (1a-A) needles (1a-B), (1c-A) plates (1c-B), prisms (1e-A) (1e-B), (1f-A) (1f-B)), which have different molecular packing modes by X-ray structure analysis, indicating that the crystals are polymorphic. In photopolymerizations...
Proton exchange membrane fuel cells (PEMFCs) have been considered to be a key technology for renewable energy systems such as an alternative battery electric vehicles (EVs), stationary power generators, and mobile phones. Intermediate temperature operation of PEMFCs overcome most the technological problems current PEM system CO poisoning, cathode overpotential, complicated water heat management. As is recognized element more efficient PEMFCs, new classes polymer electrolytes investigated...
A family of amphiphilic organic/inorganic hybrid electrolyte membranes has been synthesized through sol-gel processing bridged polysilsesquioxane macromolecules. The membrane doped with acidic moieties such as 12-phosphotungstic acid (PWA), shows proton conductivities larger than at temperatures up to 160°C. An effect the nanostructure macromolecules on conductivity is discussed. conducting properties alkylene various organic bridging groups were investigated in range 100 160°C and a...
Slipping through the lattice: Molecular oxygen reacts with crystals of quinodimethane 1 to give highly crystalline alternating copolymers by means a radical mechanism. An X-ray crystallographic study indicates that unique arrangement in crystal is crucial copolymerization.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHalogen Bond Effect for Single-Crystal-to-Single-Crystal Transformation: Topochemical Polymerization of Substituted QuinodimethaneTakahito Itoh*†, Shinji Nomura†, Hirofumi Nakasho†, Takahiro Uno†, Masataka Kubo†, Norimitsu Tohnai‡, and Mikiji Miyata‡View Author Information† Division Chemistry Materials, Graduate School Engineering, Mie University, 1577 Kurima Machiya-cho, Tsu, 514-8507, Japan‡ Department Material Life Science, Osaka 2-1 Yamadaoka,...
Solid-state alternating copolymerization took place by molecular oxygen insertion in the crystals of 7,7,8,8-tetrakis(ethoxycarbonyl)quinodimethane (1a) and 7,7-bis(ethoxycarbonyl)-8,8-bis(methoxycarbonyl)quinodimethane (1b) to form highly crystalline needlelike white solids for 1a amorphous ones 1b. The polymer structures were confirmed 1H NMR, 13C IR, elemental analysis, powder XRD, TGA measurements. However, vacuo polymerizations 1b solid state with heating photoirradiation did not take...
Gleiten durch das Gitter: Molekularer Sauerstoff reagiert in einem Radikalmechanismus mit Kristallen des Chinodimethans 1 zu hochkristallinen alternierenden Copolymer. Die röntgenographische Untersuchung ergab, dass die einzigartige Anordnung von im Kristall für Copolymerisation entscheidend ist.
Abstract Emulsions stabilized by colloidal particles, namely Pickering emulsions were prepared mixing silicone oil with silica particles dispersed in the continuous water phase as functions of concentration and viscosity. Characteristics resulting (O/W) determined measurements adsorbed amounts droplet size, some rheological responses, such hysteresis loop, stress-strain sweep curve, dynamic viscoelastic moduli. Oil droplets found to be formation a fractal structure surrounding droplets. The...
The effect of aqueous environment on fast heavy-ion radiation damage biomolecules was studied by comparative experiments using liquid- and gas-phase amino acid targets. Three types acids with different chemical structures were used: glycine, proline, hydroxyproline. Ion-induced reaction products analyzed time-of-flight secondary-ion mass spectrometry. results showed that fragments from the resulting C—Cα bond cleavage major for both For liquid-phase targets, specific originating reactions in...
We showed previously that temporal low-voltage irregular delta waves (TLID) on EEG are indicative of cerebrovascular dysfunction in its early stages. The present study was designed to determine whether the incidence this finding is elevated diabetics as compared normal controls.EEGs 50 and controls were examined. Relationships blood sugar levels, levels HbA1C stages diabetic retinopathy TLID also examined.TLID found 56% EEGs 14% (P < 0.0001). occurrence associated with presence...
Solid-state polymerization of 7,7,8,8-tetrakis(methoxyethoxycarbonyl)quinodimethane (1) was investigated in vacuo by irradiation using a high-pressure mercury lamp at 30 °C. The 1 the solid state took place very slow rate and reached to complete conversion 37 days. UV crystals formed diradical dimer as reactive intermediate, coupling reaction which afforded corresponding polymer with molecular weight >20 000. When UV-irradiated were dissolved degassed solvent,...
Thermal polymerizations and photopolymerizations of 7-alkoxycarbonyl-7-cyano-1,4-benzoquinone methides (methoxy (2a), ethoxy (2b), propoxy (2c), isopropoxy (2d), butoxy (2e), sec-butoxy (2f)) were investigated in the solid state. In thermal polymerization state, 2a, 2c, 2d, 2e polymerized to give glassy solids or a mass crystals, but both 2b 2f did not polymerize. photopolymerization all monomer crystals except for 2a corresponding polymers as needlelike solids. The polymer obtained by...
A simple explanation of the automatic power stabilization microwave light modulation is presented. The based on thermal considerations total amount heat produced in modulating crystal by and transferred from to an ambient medium. results obtained theory are qualitatively examined case with ADP at 7GHz frequency.