A5081386022- Subcritical and Supercritical Water Processes
- Catalytic Processes in Materials Science
- Chemical Synthesis and Characterization
- Phase Equilibria and Thermodynamics
- Radioactive element chemistry and processing
- Catalysis and Oxidation Reactions
- Radioactive contamination and transfer
- Industrial Gas Emission Control
- Ammonia Synthesis and Nitrogen Reduction
- Adsorption and biosorption for pollutant removal
- Free Radicals and Antioxidants
- Semiconductor materials and devices
- Quantum Dots Synthesis And Properties
- Photochemistry and Electron Transfer Studies
- Phosphorus and nutrient management
- Odor and Emission Control Technologies
- Boron Compounds in Chemistry
- Environmental remediation with nanomaterials
- Nuclear materials and radiation effects
- TiO2 Photocatalysis and Solar Cells
- Mesoporous Materials and Catalysis
- Pigment Synthesis and Properties
- Graphite, nuclear technology, radiation studies
- Cultural Heritage Materials Analysis
- Carbon Dioxide Capture Technologies
National Institute of Advanced Industrial Science and Technology
2015-2024
University of Tsukuba
2018
Nanomaterials Research (United States)
2016-2018
Tohoku University
2004-2016
Advanced Institute of Materials Science
2010
Institute for Materials Research, Tohoku University
2009
Nihon University
2005
Genesis Research Institute
2002-2005
Noritake (Japan)
2002
Prussian blue is a historical pigment synthesized for the first time at beginning of 18th century. Here we demonstrate that exhibits surprising adsorption properties gaseous ammonia. shows 12.5 mmol/g ammonia capacity 0.1 MPa, whereas standard adsorbents show only 5.08-11.3 mmol/g. Dense was also observed trace contamination in atmosphere. Results higher by analogues with optimization chemical composition. The respective capacities cobalt hexacyanocobaltate (CoHCC) and copper...
Abstract Since the early 1990s, Adschiri and his colleagues have performed research on use of supercritical water in diverse applications, including heavy oil reforming, waste polymer decomposition chemical raw materials recovery, cellulose hydrolysis sugar lignin nanoparticle synthesis. Regarding inorganic synthesis, they invented hydrothermal synthesis for continuous flow metal oxide nanoparticles, which has already found worldwide industrial applications. They proposed a two-fluid mixing...
Reactions of cellobiose in subcritical and supercritical water were studied. Kinetic study on the decomposition clarified that contribution hydrolysis to overall rate decreased retro-aldol condensation greatly increased with decreasing pressure near-critical water. It was found expressed as a first-order reaction law kinetic parameters this estimated. With regards cellobiose, it indicated second-order (first-order concentration) its activation energy preexponential factor determined....
Environmental radioactivity, mainly in the Tohoku and Kanto areas, due to long living radioisotopes of cesium is an obstacle speedy recovery from impacts Fukushima Daiichi Nuclear Power Plant accident. Although incineration contaminated wastes encouraged, safe disposal Cs enriched ash big challenge. To address this issue, while restricting release volatile atmosphere was studied. Detailed study on effective removal samples generated wood bark, household garbage, municipal sewage sludge...
Metal hexacyanoferrates (MHCF) or Prussian blue analogs are excellent Cs
A new physical method was proposed to control the liquid properties of room temperature ionic liquids (RT-ILs) in combination with nanoporous materials; melting point ILs confined nanopores remarkably decreases proportion inverse pore size.
Ammonia adsorbents effective even in trace concentrations are key to the countermeasure for air pollution of particulate matter caused by ammonia emission from agriculture sectors. We revealed that Prussian blue (PB) and its analogues (PBAs), one porous coordination polymers, have higher adsorption capacity 10 ppmv (parts per million volume, = 0.0001 volume percent), ≥8 times conventional adsorbents. Moreover, these compounds can be recycled only through water flushing. The PBA was...
An efficient preparation of size-controlled nanoparticles an open framework coordination polymer.
Designed porous copper hexacyanoferrate micro-capsule beads (CuHCF-MCB) were prepared using freeze-drying (FD).
Ceria (CeO2) nanocyrstals which could be transparently dispersed in several organic solvents were synthesized by organic-ligand-assisted hydrothermal synthesis. We have studied the dispersity of nanocrystals into typical using dynamic light scattering (DLS) measurement. The mean diameter dispersant (the nanocrystals' cluster) varied with changing solvent species. When solubility parameter (SP) values and modifier comparable to each other, tended disperse initial particle size. One...
ITO nanoparticles were synthesized hydrothermally and surface modified in supercritical water using a continuous flow reaction system. The organic modification of the converted from hydrophilic to hydrophobic, making easily dispersible solvent. addition modifier into system impacted crystal growth particle size as well dispersion. was 18 nm. Highly crystalline cubic with narrow distribution obtained. advantages short time use make this method suitable for industrial scale synthesis.
Hafnium oxide nanoparticles were synthesized via a short-duration (10 min) hydrothermal reaction. The reaction was found to produce three differently shaped nanoparticles: flower-like nanostructures (20 nm diameter), polycrystalline nanoagglomerates (25 and water-dispersible single (4 diameter). mechanisms by which these different shapes form then investigated examining the effects of precursor alkalinity presence an organic capping agent. showed very high affinity for water-soluble...
A new NH4+ adsorbent with high capacity and selectivity, sodium cobalt(ii) hexacyanoferrate(ii) (NaCoHCF, Na y Co(ii) [Fe2+(CN)6] x ·zH2O), was prepared. The adsorption performance investigated by varying the mixing ratio of [Fe(CN)6]4- to Co2+ during synthesis, Rmix. ammonia found be proportional Rmix, indicating that can increased increasing Na+-ion content in NaCoHCF. To conduct a detailed study, we prepared homogeneous nanoparticles flow synthesis using micromixer Rmix = 1.00. Even on...
Titanium dioxide (TiO2, anatase) nanocyrstals tha can be transparently (perfectly) dispersed in several organic solvents were synthesized by organic-ligand-assisted hydrothermal synthesis. To analyze the dispersion behavior of surface-modified nanocrystals from surface nanocrystals, three types TiO2 prepared. Depending on nature showed different behaviors solvents. In particular, with carboxylic acid terminated modifier (TiO2—COOH) varied strongly changing solvent species. We investigated...
UV–visible spectra of quinoline was measured in sub- and supercritical water (25 °C<T<430 °C 0.1 MPa<P<40 MPa), the degree hydrogen bonding between estimated from solvatochromic shifts π–π* absorbance band. Hydrogen decreased with increasing temperature 25 to 360 °C. At conditions (380 °C<T<400 °C), abruptly where isothermal compressibility large (0.5<ρr<1.5). In this condition, local density around lower than bulk density, namely...