A5056596698- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced MRI Techniques and Applications
- Surfactants and Colloidal Systems
- Electrochemical Analysis and Applications
- Catalytic Processes in Materials Science
- Ionic liquids properties and applications
- Solid-state spectroscopy and crystallography
- X-ray Diffraction in Crystallography
- MRI in cancer diagnosis
- Nanomaterials for catalytic reactions
- Medical Imaging Techniques and Applications
- Iron oxide chemistry and applications
- Crystallization and Solubility Studies
- Nanocluster Synthesis and Applications
- Electron and X-Ray Spectroscopy Techniques
- nanoparticles nucleation surface interactions
- Porphyrin and Phthalocyanine Chemistry
- Atomic and Subatomic Physics Research
- Ovarian cancer diagnosis and treatment
- X-ray Spectroscopy and Fluorescence Analysis
- Machine Learning in Materials Science
- Electrocatalysts for Energy Conversion
- Photochemistry and Electron Transfer Studies
- Lanthanide and Transition Metal Complexes
- Magnetism in coordination complexes
Tokushima University
2003-2025
Nara Women's University
2013-2023
Tokushima University Hospital
2021
National Institutes for Quantum Science and Technology
2020
National Archives and Records Administration
2019
Hamamatsu University School of Medicine
2013
Kyoto University
1973-2010
Kitasato University
2007
Kyushu University
2007
National Institute of Advanced Industrial Science and Technology
2003-2006
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic activity and structural analysis of polymer-protected gold-palladium bimetallic clusters prepared by the simultaneous reduction hydrogen tetrachloroaurate palladium dichlorideNaoki Toshima, Masafumi Harada, Yoshinao Yamazaki, Kiyotaka AsakuraCite this: J. Phys. Chem. 1992, 96, 24, 9927–9933Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural analysis of polymer-protected palladium/platinum bimetallic clusters as dispersed catalysts by using extended x-ray absorption fine structure spectroscopyNaoki Toshima, Masafumi Harada, Tetsu Yonezawa, Kakuta Kushihashi, and Kiyotaka AsakuraCite this: J. Phys. Chem. 1991, 95, 19, 7448–7453Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 September...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic activity and structural analysis of polymer-protected gold/palladium bimetallic clusters prepared by the successive reduction hydrogen tetrachloroaurate(III) palladium dichlorideMasafumi Harada, Kiyotaka Asakura, Naoki ToshimaCite this: J. Phys. Chem. 1993, 97, 19, 5103–5114Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 1993https://doi.org/10.1021/j100121a042RIGHTS &...
Dynamic magnetic resonance (MR) imaging was performed on a 1.5-T superconducting unit for evaluation of 26 stage I endometrial carcinomas. To establish the appearance normal uterus, 27 uteri were also evaluated. After rapid injection gadopentetate dimeglumine, dynamic images obtained every 30 seconds with spin-echo technique in sagittal plane. On studies carcinoma, tumor-myometrial contrast marked at 120 after administration dimeglumine (contrast-to-noise ratio [C/N], 26.0). The study more...
The photoreduction process of [AuCl4]− precursors in poly(N-vinyl-2-pyrrolidone) solution was investigated by utilizing a combination situ quick scanning X-ray absorption fine structure (QXAFS) and small-angle scattering (SAXS) measurements to elucidate the nucleation subsequent aggregative particle growth colloidal gold nanoparticles (Au NPs). sequence stages for reduction–nucleation association (autocatalytic surface growth) Au atoms generate NPs observed during photoreduction. QXAFS...
A comparison of the electrochemical and physicochemical behavior cobalt-based oxides with spinel structure MCo2O4 (M = Mn, Fe, Co, Ni, Zn) was conducted to investigate effect oxidation state cation distribution in on electrocatalytic activity oxygen evolution reaction (OER) an alkaline solution. Various electrocatalysts were synthesized by a facile microwave-assisted synthesis low-temperature annealing. The overpotential these for OER is comparable reported overpotentials catalysts based...
Novel chelators, i.e., 4-(2-pyridyl)-1,2,3-triazole derivatives, were synthesized by means of Cu(I)-catalyzed 1,3-dipolar cycloaddition and used to prepare luminescent Re(I) complexes [ReCl(CO)3(Bn-pyta)], [ReCl(CO)3(AcGlc-pyta)] [ReCl(CO)3(Glc-pyta)] (Bn-pyta = 1-benzyl-4-(2-pyridyl)-1,2,3-triazole, AcGlc-pyta 2-(4-(2-pyridyl)-1,2,3-triazol-1-yl)ethyl 2,3,4,6-tetra-O-acetyl-β-D-glucopyranoside, Glc-pyta β-D-glucopyranoside). X-Ray crystallography Bn-pyta indicated an azocompound-like...
Formation mechanisms of silver (Ag) particles in an aqueous ethanol solution poly(N-vinyl-2-pyrrolidone) (PVP) by the photoreduction AgClO4 were investigated means situ small-angle X-ray scattering (SAXS) measurements. The kinetics association process (nucleation, growth, and coalescence) Ag0 atoms to produce Ag was successfully revealed quantitative SAXS analysis for number-average radius (R0), number (nAg), reduced standard deviation (σR/R0), volume fraction (ϕAg) produced photoreduction....
Formation of metal nanoparticles (rhodium (Rh) and palladium (Pd) nanoparticles) in an aqueous ethanol solution poly(N-vinyl-2-pyrrolidone) (PVP) by photoreduction was monitored means situ time-resolved small-angle X-ray scattering (SAXS) measurements. The kinetics association process (nucleation, growth, particle coalescence) atoms to produce successfully evaluated the quantitative SAXS analysis for number-average radius (R0), number particles (np), standard deviation (σR/R0), total volume...
The early stage in the nucleation and subsequent aggregative particle growth of colloidal platinum (Pt) dispersions produced by photoreduction an aqueous ethanol solution poly(N-vinyl-2-pyrrolidone) (PVP) was quantitatively investigated means situ quick XAFS (QXAFS) measurements. stages reduction-nucleation association process (aggregative Ostwald ripening) Pt atoms to produce nanoparticles successfully discriminated course time. present QXAFS analysis indicated that nuclei (i.e., (Pt0)m...
Spinel ferrite MFe2O4 (M = Mn, Fe, Co, Ni, and Zn) nanoparticles, coordinated with oleylamine, oleic acid, trioctylphosphine oxide, were effectively synthesized by the microwave-assisted rapid synthesis in 1-dodecanol. nanoparticles structurally analyzed using HRTEM, SAED, HAADF-STEM, XRD, XRF, XPS, EXAFS measurements, which suggested that have 3.2–4.3 nm diameter a spinel cubic structure space group Fd3̅m. The metal composition retains an initially charged molar ratio (Fe: M 2: 1), both...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural analysis of polymer-protected platinum/rhodium bimetallic clusters using extended x-ray absorption fine structure spectroscopy. Importance microclusters for the formation clustersMasafumi Harada, Kiyotaka Asakura, and Naoki ToshimaCite this: J. Phys. Chem. 1994, 98, 10, 2653–2662Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of polymer-protected palladium-platinum bimetallic clusters at the oxidized state: extended x-ray absorption fine structure analysisMasafumi Harada, Kiyotaka Asakura, Yasumitsu Ueki, and Naoki ToshimaCite this: J. Phys. Chem. 1992, 96, 24, 9730–9738Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November...
Formation mechanisms of metal particles (rhodium (Rh) and palladium (Pd) particles) in an aqueous ethanol solution poly(N-vinyl-2-pyrrolidone) (PVP) by photoreduction were investigated UV-vis, transmission electron microscopy (TEM), situ X-ray absorption fine structure (in XAFS). The average diameter the Rh Pd prepared was estimated from TEM to be 2.2 2.0 nm, respectively. In energy-dispersive XAFS DXAFS) measurements performed investigate reduction process Rh(III) Pd(II) aqua...
SUMMARY Volume‐selective proton magnetic resonance spectroscopy (1H‐MRS) of the brain was performed with a 1.5 Tesla magnet in 47 healthy children and six adults. Peaks N‐acetylaspartate (NAA), choline (Clio) creatine (Cr) were observed all cases, but lactate peak not observed. In right parietal region, I H‐MRS revealed increases rations NAAJCho NAA/Cr decrease Cho/Cr advancing age. The most rapid changes noted between one three years 1H‐MRS frontal region also 21 cases (20 adult). there an...
The formation mechanisms of metal particles (platinum (Pt) particles) in an aqueous ethanol solution poly(N-vinyl-2-pyrrolidone) (PVP) by the photoreduction method have been studied transmission electron microscopy (TEM) and situ ex X-ray absorption fine structure (XAFS) analysis. average diameter dilute concentrated Pt PVP is estimated from TEM to be 2.0 2.5 nm, respectively. XAFS analysis was performed for reduction process Pt4+ ions metallic L3 edge colloidal dispersions solutions....
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-Angle Scattering from Hexagonally Packed Cylindrical Particles with Paracrystalline DistortionTakeji Hashimoto, Tetsuya Kawamura, Masafumi Harada, and Hideaki TanakaCite this: Macromolecules 1994, 27, 11, 3063–3072Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 1994https://pubs.acs.org/doi/10.1021/ma00089a025https://doi.org/10.1021/ma00089a025research-articleACS PublicationsRequest reuse...
Preparation processes for Pt-deposited TiO(2) (Pt/TiO(2)) by the synthesis of Pt nanoparticles and their deposition were pursued transmission electron microscopy, extended X-ray absorption fine structure, UV-vis spectroscopy, Fourier transform infrared spectroscopic studies. Colloidal dispersions particles stabilized poly(N-vinyl-2-pyrrolidone) (PVP) photochemically synthesized in aqueous ethanol solution. The average diameter was estimated to be 2.0 +/- 0.5 nm, which almost unchanged...
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTIncorporation of Metal Nanoparticles into Block Copolymer Nanodomains via in-Situ Reduction Ions in Microdomain SpaceTakeji Hashimoto, Masafumi Harada, and Naoki SakamotoView Author Information Hashimoto Polymer Phasing Project, ERATO, Japan Science Technology Corporation, Department Chemistry, Graduate School Engineering, Kyoto University, 606-8501, Cite this: Macromolecules 1999, 32, 20,...
The electronic structure of transition metal clusters is great interest for a wide range investigations including the properties catalytic systems. In order to determine dimers, calculations total energies and geometry optimizations have been carried out on Pd2, Rh2, Ru2, Au2, Pt2 dimers as well PdPt, RhPt, RuPt, PdAu using method based density functional theory (DFT) with nonlocal (NLDFT) correction. typical applications DFT determination general features Pd4, Rh4, Au4, Pt4 also performed...
Formation mechanisms of metal particles (gold (Au) particles) in an aqueous ethanol solution HAuCl4 with poly(N-vinyl-2-pyrrolidone) (PVP) by the photoreduction method were investigated UV−vis, transmission electron microscopy (TEM), and situ ex X-ray absorption fine structure (XAFS) analysis. The average diameters dilute concentrated Au PVP are estimated from TEM to be 106 Å 925 Å, respectively. XAFS analysis was carried out elucidate reduction process AuCl4- ionic species metallic for...
Photocatalytic oxidation of CO to CO2 was carried out with TiO2 and Pt/TiO2 catalysts at room temperature investigate the effect Pt deposition. The rate for photooxidation by higher than that TiO2. reaction increased incident light intensity power 0.7 0.5 dependency on concentration water vapor explained in terms Langmuir−Hinshelwood mechanism, where more efficiently adsorbed sites compared On basis diffuse reflectance FTIR spectroscopic studies photodesorption measurements, acted as active...