A5047413100- Catalytic Processes in Materials Science
- Subcritical and Supercritical Water Processes
- Catalysis and Oxidation Reactions
- Radiation Detection and Scintillator Technologies
- Catalysts for Methane Reforming
- Nanomaterials for catalytic reactions
- Innovative Microfluidic and Catalytic Techniques Innovation
- Neutrino Physics Research
- Chemical Looping and Thermochemical Processes
- Petroleum Processing and Analysis
- Luminescence Properties of Advanced Materials
- Catalysis and Hydrodesulfurization Studies
- Advanced Photocatalysis Techniques
- Phase Equilibria and Thermodynamics
- Lignin and Wood Chemistry
- Mesoporous Materials and Catalysis
- Atomic and Subatomic Physics Research
- Nanofluid Flow and Heat Transfer
- Thermochemical Biomass Conversion Processes
- Gold and Silver Nanoparticles Synthesis and Applications
- Environmental remediation with nanomaterials
- Electrocatalysts for Energy Conversion
- Ferroelectric and Piezoelectric Materials
- Gas Sensing Nanomaterials and Sensors
- Magnetic Properties and Synthesis of Ferrites
University of Suwon
2023-2025
Tohoku University
2011-2024
University of Shanghai for Science and Technology
2024
Sendai University
2019-2021
Institute for Materials Research, Tohoku University
2017
Atomic-scale analysis of the cation valence state distribution will help to understand intrinsic features oxygen vacancies (VO ) inside metal oxide nanocrystals, which, however, remains a great challenge. In this work, cerium states across ultrafine CeO2 nanocubes (NCs) perpendicular {100} exposed facet is investigated layer-by-layer using state-of-the-art scanning transmission electron microscopy-electron energy loss spectroscopy. The effect size on Ce NCs demonstrated as changed from 11.8...
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...
The improvement of SnS 2 photocatalyst can be conducted through structural modification, morphological manipulation, and heterojunction formation.
Ultrasmall metal oxide nanoparticles (<5 nm) potentially have new properties, different from conventional nanoparticles. The precise size control of ultrasmall remains difficult for oxide. In this study, the CeO2 was precisely controlled (1.3–9.4 using a continuous-flow hydrothermal reactor, and atomic distortion that occurs in oxides explored CeO2. crystalline grow rapidly like droplets via coalescence, although they reach critical particle (∼3 to 4 nm), beyond which slowly change shape...
A continuous flow reaction process in which a metal salt solution is rapidly mixed with high-temperature water was employed to achieve rapid heating up supercritical conditions. quarter of century has passed since the hydrothermal method first proposed. This paper introduces recent advances science and technology related process. Process design, kinetics, atmosphere (redox) control, morphology organic modification particles, nanocatalysts, organic-inorganic hybrid materials are reviewed for...
Although the function and stability of catalysts are known to significantly depend on their dispersion state support interactions, mechanism catalyst loading has not yet been elucidated. To address this gap in knowledge, study elucidates Pt based a detailed investigation interaction between species localized polarons (Ce3+) associated with oxygen vacancies CeO2(100) facets. Furthermore, an effective method was proposed for achieving high catalytic activity while maintaining stability....
As described herein, the synthesis of highly Cr-substituted CeO2 nanoparticles (Cr-CeO2) for low-temperature bitumen upgrading is demonstrated using a supercritical hydrothermal method including subcritical region. A continuous flow reactor that can provide non-equilibrium process was used to improve Cr substitution in lattice. Consequently, Cr-substitution concentration 22.7 mol %, which unobtainable equilibrium (5.1 %), achieved. increased, Cr-CeO2 morphology changed from perfect...
CeO2 nanoparticles exhibit potential as solid adsorbents for carbon dioxide (CO2) capture and storage (CCS), offering precise control over various facets enhancing their efficiency. This study investigated the adsorption desorption behaviors of two types nanoparticles: cubic with primarily {001} polyhedral mainly {111} facets. The results showed that despite CeO2's lower quantity, it demonstrated successful adsorption–desorption cycles in both oxidized reduced states. However, CeO2–x...
Many different formulations of the viscosity particle dispersion can be found, even for Newtonian fluids, because wide variance in components dispersion. In this work, toward unified formulation, effects size and concentration were extensively studied. The reported data dispersions collected from literature (10 nm-116 μm, ∼ 20 vol%) as well experimental acquisition SiO2 to fulfill insufficient range (from tens hundreds nanometers). analysis reveals that with sizes cannot predicted by...
In this study, the supercritical hydrothermal synthesis of cerium oxide (CeO2) nanoparticles from a Ce–carboxylate complex with different valences was performed. Ce(III) and Ce(IV) octanoates were synthesized hydrothermally treated at 400 °C for 10 min. The Ce confirmed using L3-edge X-ray absorption near-edge structure spectra. products characterized by diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy. When octanoate used as precursor, cerium(III)...
A schematic of the proposed reaction mechanism for cobalt nanoparticle formation in reductive supercritical hydrothermal process.
This paper describes a supercritical hydrothermal synthesis method as green solvent process, along with products based on this that can be used materials contribute to solving environmental problems. The first part of summarizes the basics method, including mechanism reactions, specific features state for nanoparticle synthesis, continuous flow-type reactor and applications; provides better understanding suitability synthesize materials. second Cr-doped CeO(2) nanoparticles, which show an...
Abstract This article aimed at the size‐controlled one‐pot facile synthesis of silver nanoparticles (AgNPs) by chemical reduction method and their antibacterial response against Escherichia coli (E. coli) Staphylococcus aureus (S. aureus) bacteria. AgNPs coated with without trisodium citrate (TSC) were synthesized using nitrate as a precursor hydrazine reducing agent. Spherical (average size 35 nm) formation, capping agents attachment, product purity was confirmed ultraviolet‐visible...
Abstract In this study, organic surface‐modified Ce 1‐ x Zr O 2 ‐δ nanoparticles were synthesized using supercritical hydrothermal method. X‐ray diffraction and energy‐dispersive spectroscopy analysis results indicated intake into the CeO lattice vice versa. Results obtained from thermogravimetric proved surface modification of with carboxylic acids. Decreased particle size caused by along induction was found. Extraordinarily high oxygen storage capacity at low temperatures a 70%‐Zr loading...
Mesocrystals, non-classical crystalline nanostructured materials composed of aligned nanoparticles, present analogous behavior to ordinary particle formation.
CeO2 nanocasting in a mesoporous hard template provides three-dimensionally (3D) interconnected skeleton framework consisting of nanoparticles with particles smaller than 7 nm. Low-voltage high-resolution scanning electron microscopy Ar-ion-beam cross-sectional polishing revealed numerous (∼250 nm) clusters distributed the SBA-15 mesochannels. Each consists primary nanocrystals that are mutually and coherently connected. The mesochannel walls silica might confine growth nanocrystals,...