A5058449731- Carbon Nanotubes in Composites
- Graphene research and applications
- Subcritical and Supercritical Water Processes
- Thermochemical Biomass Conversion Processes
- Fullerene Chemistry and Applications
- Gas Sensing Nanomaterials and Sensors
- Coal Combustion and Slurry Processing
- Transition Metal Oxide Nanomaterials
- Advanced Chemical Sensor Technologies
- Photochromic and Fluorescence Chemistry
- Electron and X-Ray Spectroscopy Techniques
- Environmental remediation with nanomaterials
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Luminescence Properties of Advanced Materials
- Catalysts for Methane Reforming
- Zeolite Catalysis and Synthesis
- Mechanical and Optical Resonators
- Nanotechnology research and applications
- Chemical and Physical Properties of Materials
- Nanopore and Nanochannel Transport Studies
- Thermal properties of materials
- Polydiacetylene-based materials and applications
- Chalcogenide Semiconductor Thin Films
- Catalysis for Biomass Conversion
The University of Tokyo
2002-2024
Kindai University
2023-2024
Hiroshima University
2013-2022
Institute of Engineering
2014-2017
Kyushu University
2016
Tokushima Bunri University
2016
Kansai University
2016
Hiroshima University of Economics
2010
Gifu University
2005
University of Miyazaki
1993
Supercritical water gasification is expected to be an effective process for wet biomass, but its reaction kinetics has not been elucidated actual biomass feedstocks. In this study, seven species are gasified in a supercritical reactor with and without use of suspended activated carbon catalyst, the overall rates determined. The feedstocks can classified into three groups depending on characteristics. Representative gasification-rate parameters presented. homogeneous had pre-exponential...
We herein report the effect of feedstock heating rate on supercritical water gasification a glucose/guaiacol mixture. In study, glucose was employed as model compound for cellulose and guaiacol lignin. A mixture (0.34 wt %) (0.16 fed into laboratory-scale continuous reactor at 600 °C 25 MPa through preheater, where could be controlled. Feedstock flow rates 1 2 g/min were along with preheaters three different lengths (i.e., 0.45, 0.9, 1.8 m). found that longer resulted in slower same rate....
The electric conductance of carbon-nanotube (CNT) films is affected by gas adsorption. Previous studies have shown that the adsorption molecules on CNT/CNT interface key to changing CNT-film conductance. However, it still unclear how affect conduction or its electron transport properties. We present here a study effects gas-molecule using fluctuation-induced tunneling (FIT) model electrical conduction. demonstrated follows FIT model, and subsequently estimated electrostatic potential between...
Effect of organic acids on char suppression in supercritical water gasification (SCWG) was investigated. When acetic acid or formic added to the SCWG guaiacol, production suppressed. Acetic also effectively suppressed formation a Shochu residue. an optimal amount added, drastically suppressed, while hydrogen produced excess acid. Further addition increased as well methane and carbon dioxide. We believe that function radical scavengers suppress usually occurs via mechanism.
Gas sensors based on carbon nanotube (CNT) films have attracted attention owing to their low power consumption. For further development of these sensors, we need understand the surface interaction with gas molecules. In our previous research, investigated influence water molecules electrical conductance multi-walled CNT and explained this phenomenon using a two-layer adsorption model. This work motivated us measure energy CNT-H2O. study, focused first-layer sheet resistance vapor pressure at...
The gasification characteristics of five amino acids, i.e., glycine, alanine, valine, leucine, and proline, in supercritical water were compared. A tubular reactor was employed for the reactions temperature range 500 to 650 ℃ with a reaction pressure 25 MPa residence time 86-119 s. leucine determined be similar, while rate valine much slower. activation energies proline lower than those leucine. These behaviors are attributed stability transition state carboxyl radical production secondary...
Alanine solution (1.0-3.0 wt%) was gasified in supercritical water using a tubular reactor at temperature of 500 to 650 °C and pressure 25 MPa for residence time 86-119 s compared the gasification characteristic with our previous work, glycine. The identification quantification gaseous products were conducted by gas chromatography (GC) total organic carbon (TOC) aqueous phase also determined. efficiency alanine rose increasing reaction rate followed first order kinetics. It well expressed...
Using a recently developed sensitive enzyme immunoassay (EIA) for TSH, serum TSH levels in normal subjects and patients with various thyroid disorders were measured. The minimum detectable concentration was less than 0.005 mU/l. An excellent correlation observed between values measured by EIA radioimmunoassay (r = 0.932). In 26 subjects, ranged from 0.30 to 2.65 mU/l (geometric mean 0.97 mU/l). 27 untreated hyperthyroid Graves' patients, detected all but one, ranging 0.19 0.040). These...
Photochromic nanoparticles of zinc-silicon oxide were synthesized using plasma enhanced chemical vapor deposition. These particles turned black upon irradiating with ultraviolet light. We investigated this phenomenon density functional theory calculations. Silicon inclusions create trap levels and oxygen defects that reduce the ionization potential ZnO. This forms a quantum between ZnO oxide, excited electron is stable. Because also increase bond overlap population zinc atoms in crystal,...
The chemical reactions of transition metal clusters in the gas phase have aroused considerable scientific interest and are also critical importance. For example, these involved synthesis single-walled carbon nanotubes, which considered ideal materials because their outstanding properties. Alcohol catalytic vapor deposition (ACCVD) is one best synthetic processes for nanotubes (CNTs); however, even initial growth mechanism still unclear, unlike those other processes. In this study, we used a...
We studied physical and chemical adsorption on carbon nanotube surfaces measured the effect of their electric conductance. The increase in capacitance at interface (due to physisorption) disturbed carrier transport, while chemisorption induced charge transfer resulted an or decrease principle transport films could be clearly explained by applying a fluctuation-induced tunneling model. Our model proved that surface coverage ratio conductance change are closely correlated.