A5028785678- Fuel Cells and Related Materials
- Membrane-based Ion Separation Techniques
- Advanced Battery Materials and Technologies
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Conducting polymers and applications
- Lignin and Wood Chemistry
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Technologies Research
- Advanced Cellulose Research Studies
- Membrane Separation Technologies
- Advanced Chemical Sensor Technologies
- Transition Metal Oxide Nanomaterials
- Polymer Nanocomposite Synthesis and Irradiation
- Electrochemical Analysis and Applications
- Electron and X-Ray Spectroscopy Techniques
- Catalytic Processes in Materials Science
- Cellular Mechanics and Interactions
- Synthetic Organic Chemistry Methods
- Nanopore and Nanochannel Transport Studies
- Polymer crystallization and properties
- Cholinesterase and Neurodegenerative Diseases
- Catalytic Cross-Coupling Reactions
- Membrane Separation and Gas Transport
- Analytical Chemistry and Sensors
National Institutes for Quantum Science and Technology
2016-2025
Takasaki Advanced Radiation Research Institute
2017-2024
Advanced Science Research Center
2017-2020
Takasaki City University of Economics
2017-2018
Japan Atomic Energy Agency
2010-2016
Fukuoka University
1998
Nagoya Institute of Technology
1993
Cellulose was extracted from rice husk using the formic/peroxyformic acid process at an atmospheric pressure.
Sugarcane bagasse (SCB) is a renewable biomass source for cellulose extraction. In the pretreatment, SCB processed to break down cellulose-lignin-hemicellulose matrix and isolate components. This work proposes formic/peroxyformic acid process extracting nanocrystals (CNCs) from SCB. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, solid-state 13C nuclear magnetic resonance (ss- NMR) were employed evidence removal of wax, hemicellulose, lignin raw X-ray diffraction (XRD),...
The partial scattering function (PSF) analysis through contrast variation small-angle neutron experiments is applied to characterize structures of anion-exchange membranes (AEMs), prepared by graft copolymerization 2-methyl-N-vinylimidazolium (Im) and styrene (St) monomers with Im/St ratios 62/38 26/74 (denoted as AEM_IS64 AEM_IS37, respectively), on a poly(ethylene-co-tetrafluoroethylene) base polymer (BP). PSF self-terms can be expressed the combination mass fractal, Teubner–Strey, Guinier...
We comprehensively investigate the hierarchical structures of previously reported radiation-grafted anion-exchange membranes (AEMs), consisting p-(2-imidazoliumyl) styrene graft-polymers onto poly(ethylene-co-tetrafluoroethylene) (ETFE) films with different grafting degrees (GD), using partial scattering function (PSF) analysis. first confirm existence a characteristic GD (GDc) 20–25%, over which AEMs show enhanced anion transport efficiency. To clarify structure features in correlation GDc,...
ABSTRACT Silicone rubbers, such as polydimethylsiloxane (PDMS), have been widely used in biotechnology and medical science because of their excellent properties. However, microfabrication silicone rubbers remains to be problematic the high viscosity adhesiveness (tackiness) rubber, making it difficult fill molds reproduce shapes during soft lithography. Also, patterns made rubber are prone pattern collapse. To address these, we designed molecules that can modified by radiation whose hardness...
The KWS-2 small-angle neutron scattering (SANS) diffractometer operated by Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum, Garching, Germany, is dedicated to the investigation of mesoscopic multi-scale structures and structural changes due rapid kinetic processes in soft condensed matter biophysical systems. Following requests from user community, it has been repeatedly upgraded with respect most important methodological parameters an instrument this type, namely...
The hierarchical structures of graft-type poly(ethylene-co-tetrafluoroethylene) (ETFE)-based polymer electrolyte membranes (ETFE-PEMs) were investigated using small- and ultrasmall-angle X-ray scattering experiments. ETFE-PEMs with ion exchange capacities (IECs) <2.4 mmol/g possessed conducting graft domains around lamellar crystals, a d-spacing 21.8–29.1 nm, oriented crystallites (lamellar grains) short long correlation distances 218–320 903–1124 respectively. IECs > 2.7 showed new phase...
We investigated the morphology and swelling behavior of a new graft-type anion exchange membrane (AEM) containing 2-methylimidazolium groups by using contrast variation small angle neutron scattering (SANS) technique. These AEMs were prepared radiation-induced grafting 2-methyl-1-vinylimidazole styrene into poly(ethylene-co-tetrafluoroethylene) (ETFE) films subsequent N-alkylation with methyliodide, possessed both high alkaline durability conductivity. Our results showed that crystalline...
A fully hydrated Nafion membrane is generally treated as a three-component system comprising the tetrafluoroethylene-like main chain, fluorinated side chain ending with sulfonic acid group, and absorbed water. We applied contrast variation small-angle neutron scattering technique to decompose intensity profiles partial functions (PSFs) of each component in quantitatively. In large scale (>30 nm), structural heterogeneities were observed main- side-chain domains but not water domains. middle...
The conventional hydration number, λ, of a polymer electrolyte membrane (PEM) is estimated by the gravimetric measurement total water uptake in membrane. This overall molecules divided number ionic groups covering distribution from macroscale to molecular level. For more precise evaluation local ion-water interactions and ion transport efficiency hydrophilic channels, contrast we here propose an index, (λlocal), defined as located adjacent interacting with PEM, per group channels. We...
Graft-type anion-conducting electrolyte membranes (AEMs) with imidazolium cations on graft polymers were synthesized through radiation-induced polymerization of N-vinylimidazole (NVIm) poly(ethylene-co-tetrafluoroethylene) (ETFE) films, followed by N-propylation and ion-exchange reactions. The proceeded quantitatively, whereas the reactions in 1 M KOH at 60°C accompanied partial β-elimination to yield copolymer grafts consisting poly-(1-vinyl-3-propylimidazolium hydroxide) double bonds...
Compounds derived from two major biomass components, cellulose and lignin, were artificially recombined via the radiation-induced graft polymerization of vinyl monomers, which could be potentially sourced onto fabric. This process yielded organic hybrids featuring a substrate surface aldehyde groups lignin-obtained vanillin. Then, Kabachnik–Fields three-component reaction (KF-3CR) poly(methacrylated vanillin) (PMV)-sourced aldehydes was carried out with amines phosphites. Overall, KF-3CR on...
Newly designed styrylimidazolium-based grafted anion-exchange membranes (StIm-AEMs), in which imidazolium ionic groups are attached to styrene at the far side from graft chains, were prepared by radiation-induced polymerization of p-(2-imidazoliumyl) onto poly(ethylene-co-tetrafluoloethylene) (ETFE) films, followed N-alkylation and ion-exchange reactions. StIm-AEM having an ion exchange capacity (IEC) 0.54 mmol g-1 with a grafting degree (GD) ∼18%, possesses practical conductivity (>50 mS...
Abstract Graft‐type anion‐conducting polymer electrolyte membranes (AEMs) are prepared by the radiation‐induced graft polymerization of chloromethylstyrene into poly(ethylene‐ co ‐tetrafluoroethylene) (ETFE) films and subsequent quaternization with trimethylamine. AEMs in hydroxide form (AEM‐OH) immersing chloride (AEM‐Cl) 1 M potassium (KOH) solution, followed KOH washing nitrogen‐saturated water to prevent bicarbonate formation (AEM‐HCO 3 ). The AEM‐OH shows conductivity uptake four two...
The partial scattering function analysis was applied to determine the exact structure of radiation-grafted proton-exchange membranes, made poly(styrenesulfonic acid)-grafted poly(ethylene-co-tetrafluoroethylene) (ETFE-g-PSSA). Hydrated ETFE-g-PSSA membranes were treated as a three-component system comprising ETFE base polymer (BP), PSSA graft (GP), and absorbed water. On large length scale, grains with an approximate radius gyration (Rg) 150 nm mass fractal dimension 2.4 observed. These...
We report a novel ionic structure of dispersed ions and its impact on conducting properties.
We found unprecedented reverse relationships in anion-exchange membranes (AEMs) for Pt-free alkaline fuel cell systems, i.e., the increase hydrophobicity increased water uptake and susceptibility to hydrolysis. AEMs with graft copolymers that composed of anion-conducting 2-methyl-N-vinylimidazolium (Im) hydrophobic styrene (St) units were employed. characterized two new structures these using a small-angle neutron scattering contrast variation method. (1) The distribution polymers conducting...
We studied anion transport behaviors in grafted exchange membranes (AEMs) composed of 2-methyl-N-vinylimidazole (Im) and styrene (St) having various Im/St ratios (6/4, 4/6, 3/7) onto poly(ethylene-co-tetrafluoroethylene) films (named AEM64, AEM46, AEM37). The properties were evaluated based on the efficiency defined as diffusion coefficients AEMs to dilution solutions (D/D0) correlated morphology analyzed by small angle scattering method. found a master curve D/D0 with hydration for...
This work presents a strategy to reveal the key structural factor of local hydration number (λlocal) for improving chemical stability hydrocarbon-based polymer electrolyte membranes (PEMs), which is major challenge their application in energy conversion devices such as fuel cells and electrolyzers. λlocal defined water molecules surrounding ion-conducting ionic groups nanometer-scale ion channels, determined by partial scattering function analysis. In series radiation-grafted PEMs,...