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Optical properties of fcc C 60 samples have been studied by using photoacoustic spectroscopy over the temperature range 30–300 K. A sharp absorption edge is seen at 1.7 eV at room temperature. The optical absorption spectrum changes... more
Optical properties of fcc C 60 samples have been studied by using photoacoustic spectroscopy over the temperature range 30–300 K. A sharp absorption edge is seen at 1.7 eV at room temperature. The optical absorption spectrum changes drastically at 80 K. Another change of absorption spectrum is also observed at 260 K. These changes can be explained by the molecular motion of C 60 .
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Photoacoustic spectroscopy measurements have been carried out on the Se-ring microclusters confined in the cages of zeolite 4A. The shift of photoabsorption edge and the new absorption bands around 1.5 and 1.9 eV appeared by illumination... more
Photoacoustic spectroscopy measurements have been carried out on the Se-ring microclusters confined in the cages of zeolite 4A. The shift of photoabsorption edge and the new absorption bands around 1.5 and 1.9 eV appeared by illumination of the light having the band-gap energy at low temperature. These phenomena may be associated with the distortion of Se ring and the formation of dangling bonds. Mixing of S or Te to the Se microclusters causes appreciable change in the photoinduced phenomena.
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Research Interests: Chemistry, Analytical Chemistry, Chromatography, Mass Spectrometry, Medicine, and 15 moreCannabinoids, Chemiluminescence, Antioxidant, Cell, Physical sciences, Products, Luminescence, Plant Roots, Cannabis, Profiling, Cannabinoid, Constituents, Chemoluminescence, Plant Leaves, and Potassium Permanganate
This is a collection of selected, peer reviewed papers from the International Conference on Nanomaterials: Science, Technology and Applications (ICM' 13), December 5-7, 2013, Chennai, India. The 54 papers are grouped as follows: Nano... more
This is a collection of selected, peer reviewed papers from the International Conference on Nanomaterials: Science, Technology and Applications (ICM' 13), December 5-7, 2013, Chennai, India. The 54 papers are grouped as follows: Nano Materials: Synthesis and Characterisation, Electrical, Magnetic, Optical Properties of Nanomaterials, Polymers and Nanocomposites, Bio Nanomaterials and their Applications, Nanomaterials: Energy & Environment, and, Nanomaterials: Theoretical and Computational Studies.
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... for chalcogen Correspondence to: Professor H. Endo, Department of Physics, Faculty of Science, Kyoto University, Oiwake-cho, Kitasira: kawa, Sakyo-cho ... A theoretical study by Ikawa and Fukutome has revealed that, near the chain... more
... for chalcogen Correspondence to: Professor H. Endo, Department of Physics, Faculty of Science, Kyoto University, Oiwake-cho, Kitasira: kawa, Sakyo-cho ... A theoretical study by Ikawa and Fukutome has revealed that, near the chain end, chalcogen chains tend to have a planar ...
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EXAFS measurements have been carried out on Se K-edge and Te K-edge for Se8-x Te x and Se8-x S x microclusters with 8 chalcogen atoms. The clusters with various compositions were isolated in a synthetic 4A zeolite which has 11Å-diameter... more
EXAFS measurements have been carried out on Se K-edge and Te K-edge for Se8-x Te x and Se8-x S x microclusters with 8 chalcogen atoms. The clusters with various compositions were isolated in a synthetic 4A zeolite which has 11Å-diameter cage units. The data analysis led us to believe that the clusters form 8-membered rings in the cage. In Se8-x Te x microclusters, Se–Se bonds and Te–Te bonds are shorter than those in the crystalline state. It is found that Se–Te unlike-pairs are preferred over Se–Se and Te–Te like pairs. On the other hand, in Se8-x S x microclusters, Se–Se and S–S like-pairs are found to be preferred over Se–S unlike-pairs.
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Ce0.80Pr0.12Sn0.08O2−δ combination catalyst exhibited highest CO oxidation activity owing to its high specific surface area, better reducibility, superior surface active oxygen species, and oxygen vacancies among various samples... more
Ce0.80Pr0.12Sn0.08O2−δ combination catalyst exhibited highest CO oxidation activity owing to its high specific surface area, better reducibility, superior surface active oxygen species, and oxygen vacancies among various samples investigated.
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The authors maintain a culture collection of over 2,500 cyanobacteria and photosynthetic bacteria and 2,000 eukaryotic algae for research on H{sub 2} biophotoproduction as well as other projects. A high H{sub 2}-producing strain... more
The authors maintain a culture collection of over 2,500 cyanobacteria and photosynthetic bacteria and 2,000 eukaryotic algae for research on H{sub 2} biophotoproduction as well as other projects. A high H{sub 2}-producing strain Synechococcus sp. Miami BG 043511 from the collection has been used to examine H{sub 2} production in relation to water photolysis and substance degradation, high O{sub 2}-tolerance characterization of nitrogenase, and interactive effects of light intensity and cell density on H{sub 2} production and its stable isotope fractionation. When cellular carbohydrate is depleted, no H{sub 2} production occurs. However, when pyruvate or glucose is added, H{sub 2} production begins. On the other hand, when glucose and DCMU are added to cellular carbohydrate-depleted cells from synchronous cultures, H{sub 2} production is inhibited compared with that with glucose addition alone. These results indicate that water photolysis alone cannot directly induce H{sub 2} product...
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To develop efficient materials for CO oxidation, a series of co-doped CeO₂ ternary oxide solid solutions (Ce₀.₈₀M₀.₁₂Sn₀.₀₈O₂₋δ, M = Hf, Zr, Pr, and La) were prepared by a simple coprecipitation method. The fundamental characteristics of... more
To develop efficient materials for CO oxidation, a series of co-doped CeO₂ ternary oxide solid solutions (Ce₀.₈₀M₀.₁₂Sn₀.₀₈O₂₋δ, M = Hf, Zr, Pr, and La) were prepared by a simple coprecipitation method. The fundamental characteristics of the co-doped CeO₂ samples were studied by X-ray diffraction, Raman spectroscopy, UV-visible diffuse reflectance spectroscopy, transmission electron microscopy, Brunauer–Emmett–Teller surface area, H₂-temperature programmed reduction, X-ray photoelectron spectroscopy, and O₂-temperature programmed desorption. The oxidation of CO was chosen as a model reaction to evaluate the catalytic performance of these samples. The characterization results revealed that ternary oxide solid solutions had significantly enhanced surface area, improved reducibility, increased oxygen mobility and higher quantity of surface adsorbed oxygen species and oxygen vacancies, compared to undoped CeO₂. The CO oxidation performance of CeO₂ was greatly improved upon co-doping due...
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Widely known for its recreational use, the cannabis plant also has the potential to act as an antibacterial agent in the medicinal field. The analysis of cannabis plants/products in both pharmacological and forensic studies often requires... more
Widely known for its recreational use, the cannabis plant also has the potential to act as an antibacterial agent in the medicinal field. The analysis of cannabis plants/products in both pharmacological and forensic studies often requires the separation of compounds of interest and/or accurate identification of the whole cannabinoid profile. In order to provide a complete separation and detection of cannabinoids, a new two-dimensional liquid chromatography method has been developed using acidic potassium permanganate chemiluminescence detection, which has been shown to be selective for cannabinoids. This was carried out using a Luna 100 Å CN column and a Poroshell 120 EC-C18 column in the first and second dimension respectively. The method has utilised a large amount of the available separation space with a spreading angle of 48.4° and a correlation of 0.66 allowing the determination of more than 120 constituents and mass spectral identification of ten cannabinoids in a single analy...
Research Interests: Chemistry, Analytical Chemistry, Chromatography, Mass Spectrometry, Medicine, and 15 moreCannabinoids, Chemiluminescence, Antioxidant, Cell, Physical sciences, Products, Luminescence, Plant Roots, Cannabis, Profiling, Cannabinoid, Constituents, Chemoluminescence, Plant Leaves, and Potassium Permanganate
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Photoacoustic spectroscopy measurements have been carried out on the Se-ring microclusters confined in the cages of zeolite 4A. The shift of photoabsorption edge and the new absorption bands around 1.5 and 1.9 eV appeared by illumination... more
Photoacoustic spectroscopy measurements have been carried out on the Se-ring microclusters confined in the cages of zeolite 4A. The shift of photoabsorption edge and the new absorption bands around 1.5 and 1.9 eV appeared by illumination of the light having the band-gap energy at low temperature. These phenomena may be associated with the distortion of Se ring and the formation of dangling bonds. Mixing of S or Te to the Se microclusters causes appreciable change in the photoinduced phenomena.
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... a. oo. 739.747.1997 A18aoeo 5n nina Oe 1997 Ana Ia11aona 1in. ... a20c iaoan1 ii1o a 1aa Iaaa 1aaa(oao o 150D ia aUioa. A (Ooi i DaDU o Ia eaio ieooaa naoan1 a 51iO1nai1 eanaaaca o oaaEn1a c1aa, aaceOi o 1030 io oiiinEooaaca oaa 1n1a5... more
... a. oo. 739.747.1997 A18aoeo 5n nina Oe 1997 Ana Ia11aona 1in. ... a20c iaoan1 ii1o a 1aa Iaaa 1aaa(oao o 150D ia aUioa. A (Ooi i DaDU o Ia eaio ieooaa naoan1 a 51iO1nai1 eanaaaca o oaaEn1a c1aa, aaceOi o 1030 io oiiinEooaaca oaa 1n1a5 i aIc IaiinaocIoa aaaiaIa. ...
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Mechanochemical processing of zirconium and yttrium chloride precursors with lithium hydroxide has been used to synthesise ultrafine powders of yttria-stabilised zirconia. The precursors reacted during milling to form a composite... more
Mechanochemical processing of zirconium and yttrium chloride precursors with lithium hydroxide has been used to synthesise ultrafine powders of yttria-stabilised zirconia. The precursors reacted during milling to form a composite consisting of nanocrystalline oxide grains embedded within a matrix of lithium chloride. The ultrafine powder was recovered subsequently by removing the lithium chloride through washing with deionised water and methanol.
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Optical properties of fcc C 60 samples have been studied by using photoacoustic spectroscopy over the temperature range 30–300 K. A sharp absorption edge is seen at 1.7 eV at room temperature. The optical absorption spectrum changes... more
Optical properties of fcc C 60 samples have been studied by using photoacoustic spectroscopy over the temperature range 30–300 K. A sharp absorption edge is seen at 1.7 eV at room temperature. The optical absorption spectrum changes drastically at 80 K. Another change of absorption spectrum is also observed at 260 K. These changes can be explained by the molecular motion of C 60 .
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In this study, mechanochemical reaction systems with H2WO4 as a precursor were investigated for the synthesis of nanoparticulate powders of WO3, ZnWO4, and dual-phase (ZnWO4)x(ZnO)1–x. The objective was to establish whether... more
In this study, mechanochemical reaction systems with H2WO4 as a precursor were investigated for the synthesis of nanoparticulate powders of WO3, ZnWO4, and dual-phase (ZnWO4)x(ZnO)1–x. The objective was to establish whether mechanochemical processing can be used to manufacture high activity photocatalysts in the ZnO–WO3 system. Milling and heat treatment of H2WO4+12NaCl was found to result in the formation of irregularly
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... and attained a constant value at a temperature of 350°C. Although a weak hump was observed at 170°C, there was no clear evidence of a two-step decomposition, as in the case ofGd(OH)3 ... B. Murray, DJ Norris, and MG Bawendi,... more
... and attained a constant value at a temperature of 350°C. Although a weak hump was observed at 170°C, there was no clear evidence of a two-step decomposition, as in the case ofGd(OH)3 ... B. Murray, DJ Norris, and MG Bawendi, Synthesis and Characterization of Nearly ...
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Ultrafine alumina particles have been prepared by the mechanical milling and subsequent heat treatment of a mixture of AICI3 and CaO. Heat treatment of the as‐milled powder at temperatures above 350°C and washing with water resulted in... more
Ultrafine alumina particles have been prepared by the mechanical milling and subsequent heat treatment of a mixture of AICI3 and CaO. Heat treatment of the as‐milled powder at temperatures above 350°C and washing with water resulted in γ‐Al2O3 particles 10–20 nm in size. Single phase α‐Al2O3 was formed in the sample after heat treatment at 1250°C. This study demonstrates a novel process for synthesizing nanoscale alumina particles.
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ABSTRACT The authors studied how the chain structure of liquid Te is modified by adding halogen or alkali atoms. EXAFS measurements have been carried out using synchrotron radiation. Liquid Te has a twofold-coordinated structure with... more
ABSTRACT The authors studied how the chain structure of liquid Te is modified by adding halogen or alkali atoms. EXAFS measurements have been carried out using synchrotron radiation. Liquid Te has a twofold-coordinated structure with longer and shorter covalent bonds. By addition of Na and K, the length of the longer bond is considerably reduced, suggesting a structural modification of the Te zigzag chain. If Rb is added, the difference in length of the longer and shorter bonds is relatively large compared with the Na and K cases. For the liquid Te mixture containing 20 at.%Cl, only one Te-Te bond can be recognized within the chain.
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... for chalcogen Correspondence to: Professor H. Endo, Department of Physics, Faculty of Science, Kyoto University, Oiwake-cho, Kitasira: kawa, Sakyo-cho ... A theoretical study by Ikawa and Fukutome has revealed that, near the chain... more
... for chalcogen Correspondence to: Professor H. Endo, Department of Physics, Faculty of Science, Kyoto University, Oiwake-cho, Kitasira: kawa, Sakyo-cho ... A theoretical study by Ikawa and Fukutome has revealed that, near the chain end, chalcogen chains tend to have a planar ...
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ABSTRACT Extended X-ray absorption fine structure (EXAFS) has been measured for supercooled liquid and glassy CdRb(NO3)3 on the K-edges of both Cd and Rb using synchrotron radiation. The partial coordination number of oxygen around the... more
ABSTRACT Extended X-ray absorption fine structure (EXAFS) has been measured for supercooled liquid and glassy CdRb(NO3)3 on the K-edges of both Cd and Rb using synchrotron radiation. The partial coordination number of oxygen around the Rb+ cation increases rapidly with decreasing temperature, while the coordination number around the Cd2+ cation varies little. The Rb-O distance becomes appreciably longer with decreasing temperature in spite of the volume contraction. The results suggest that the monovalent Rb+ and divalent Cd2+ cations may play a different role when the liquid is transformed to a glassy state.
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EXAFS measurements have been carried out on Se K-edge and Te K-edge for Se8-x Te x and Se8-x S x microclusters with 8 chalcogen atoms. The clusters with various compositions were isolated in a synthetic 4A zeolite which has 11Å-diameter... more
EXAFS measurements have been carried out on Se K-edge and Te K-edge for Se8-x Te x and Se8-x S x microclusters with 8 chalcogen atoms. The clusters with various compositions were isolated in a synthetic 4A zeolite which has 11Å-diameter cage units. The data analysis led us to believe that the clusters form 8-membered rings in the cage. In Se8-x Te x microclusters, Se–Se bonds and Te–Te bonds are shorter than those in the crystalline state. It is found that Se–Te unlike-pairs are preferred over Se–Se and Te–Te like pairs. On the other hand, in Se8-x S x microclusters, Se–Se and S–S like-pairs are found to be preferred over Se–S unlike-pairs.
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The photodarkening phenomena of amorphous Se have been studied by the optical absorption coefficient, sound velocity and attenuation measurements. The light illumination at low temperatures induces the photodarkening, and the... more
The photodarkening phenomena of amorphous Se have been studied by the optical absorption coefficient, sound velocity and attenuation measurements. The light illumination at low temperatures induces the photodarkening, and the photodarkened state is completely recovered by annealing near 306 K corresponding to the glass transition temperature. The photodarkening is enhanced by application of pressure. The sound velocity decreases and the sound attenuation increases by the illumination at low temperature. These suggest that a structural disorder increases in the photodarkened state. Three stages are observed for the recovery process of the photodarkened specimen. The photodarkening and the recovery process are discussed on the basis of VAP (valence alternative pair) model.
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This is the first report of chemiluminescence from the reaction of cannabinoids with acidic potassium permanganate, which we have applied to the high performance liquid chromatography (HPLC) determination of cannabidiol (CBD) in... more
This is the first report of chemiluminescence from the reaction of cannabinoids with acidic potassium permanganate, which we have applied to the high performance liquid chromatography (HPLC) determination of cannabidiol (CBD) in industrial‐grade hemp. The intensities of the light‐producing reactions with two commercially available cannabinoid standards were compared to that of seven model phenolic analytes. Resorcinol, representing the parent phenolic moiety of the cannabinoid class, was shown to react with the permanganate reagents in a manner more similar to phenol than to its hydroxyphenol positional isomers, pyrocatechol and hydroquinone. Alkyl substituents on the phenolic ring, however, have a considerable impact on emission intensity that is dependent upon the position of the groups and the composition of the permanganate reagent. This analytical approach has potential for the determination of other cannabinoids including Δ9‐tetrahydrocannabinol in drug‐grade cannabis. Copyrig...
Research Interests: Chemistry, Analytical Chemistry, Medicine, Cannabinoids, Chemiluminescence, and 11 moreTHC, Cannabis, High Pressure Liquid Chromatography, Phenols, Green Reagent, Sensitivity and Specificity, Hydroquinone, Cannabinoid, Potassium Permanganate, Cannabidiol, and Pharmacology and pharmaceutical sciences
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Fabrication of carbon nanofiber by pyrolysis of freeze-dried cellulose nanofiber Ehsan Jazaeri Liyuan Zhang Xungai Wang Takuya Tsuzuki ... After pyrolysis of freeze-dried cellulose nanofibers below 600 °C, amorphous carbon fibers of... more
Fabrication of carbon nanofiber by pyrolysis of freeze-dried cellulose nanofiber Ehsan Jazaeri Liyuan Zhang Xungai Wang Takuya Tsuzuki ... After pyrolysis of freeze-dried cellulose nanofibers below 600 °C, amorphous carbon fibers of *20 nm in diameter were obtained. ...
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The aim of this study was to understand the structure and biodegradation relationships of silk particles intended for targeted biomedical applications. Such a study is also useful in understanding structural remodelling of silk debris... more
The aim of this study was to understand the structure and biodegradation relationships of silk particles intended for targeted biomedical applications. Such a study is also useful in understanding structural remodelling of silk debris that may be generated from silk-based implants. Ultrafine silk particles were prepared using a combination of efficient wet-milling and spray-drying processes with no addition of chemicals other than those used in degumming. Milling reduced the intermolecular stacking forces within the β-sheet crystallites without changing the intramolecular binding energy. Because of the rough morphology and the ultrafine size of the particles, degradation of silk particles by protease XIV was increased by about 3-fold compared to silk fibers. Upon biodegradation, the thermal degradation temperature of silk increased, which was attributed to the formation of tight aggregates by the hydrolyzed residual macromolecules. A model of the biodegradation mechanism of silk particles was developed based on the experimental data. The model explains the process of disintegration of β-sheets, supported by quantitative secondary structural analysis and microscopic images.