A5078441643- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Polymer Surface Interaction Studies
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- 3D Printing in Biomedical Research
- Bone Tissue Engineering Materials
- Acoustic Wave Resonator Technologies
- Advanced Polymer Synthesis and Characterization
- Nuclear Materials and Properties
- Hydrogen Storage and Materials
- Facial Trauma and Fracture Management
- Semiconductor materials and devices
- Innovative Microfluidic and Catalytic Techniques Innovation
- Ga2O3 and related materials
- Metal and Thin Film Mechanics
- Conducting polymers and applications
- Laser-induced spectroscopy and plasma
- Dental Implant Techniques and Outcomes
- Magnetic properties of thin films
- RFID technology advancements
- Hydrogels: synthesis, properties, applications
- Orthopaedic implants and arthroplasty
- Rare-earth and actinide compounds
- Advanced Combustion Engine Technologies
Yokohama National University
2023
Shizuoka University
2013-2016
Osaka University
1999-2013
Tokyo University of Science
2001-2006
National Institute for Materials Science
2006
Bioengineering Center
2006
Hokkaido University
2006
The University of Tokyo
2006
Abstract The fabrication of quasi-phase-matching (QPM) crystals by selective-area growth on the two asymmetrically polar surfaces GaN is examined. We attempted GaN-QPM one-time using a carbon mask. For double-polarity (DP-SAG), we investigated effect varied nitriding times Al 2 O 3 templates patterned with optimized conditions for DP-SAG process, and evaluated substrate fabricated process. In addition, examined interface formation mechanism DP-GaN determined that it possible to fabricate...
For nonlinear optical applications using gallium nitride (GaN), periodic inversion of crystallographic orientation (polarity) is required for quasi-phase matching. We developed a novel procedure designing polarity patterns in GaN metal organic vapor phase epitaxy (MOVPE), and we used this to fabricate polarity-inverted films. By carbon mask the formation selective area, substrate nitriding removal area were carried out epitaxial growth process. In report, double-polarity (DP-SAG) was...
Hydroxyapatite (HAp)-20 vol% β-tricalcium phosphate (β-TCP) composites were prepared. The effect of β-TCP size on bone-like layer growth and adhesion osteoblast-like cells the was systematically studied in vitro. When soaked a simulated body fluid, formation rates increased with increasing size, even if volume fraction constant. Moreover, selective dissolution phase around frequently observed. Higher Ca2+ concentration due to fast beneath sample surface resulted faster layer, especially...
Polypyridine grafted with poly(ethylene glycol) (Py-g-PEG) have been synthesized. Radical copolymerization of methyl-terminated PEG macromonomer 4-pyridylmethyl methacrylate homogeneously proceeded and the obtained copolymer spontaneously adsorbs from aqueous solution onto gold surfaces, where pyridine parts act as multipoint anchor to surface provide strong steric repulsion between chains. As a result, highly protein repellent stable was constructed through attachment compared singlepoint...
Calcium-deficient hydroxyapatite (DAp) was synthesized by hydrolysis of α-TCP at different pH. Ca/P ratio DAp increased with increasing pH during the hydrolysis. In addition, which lower pH, showed higher solubility in simulated body fluid (SBF) and had a more negatively charged surface than that Bone-like crystals were formed on have been soaked SBF 309.5 K vitro. demonstrated faster formation bone-like layer stoichiometric (HAp). Moreover, much The adhesion MC3T3-E1 osteoblast-like cells...
In this study, polyethylene glycol (PEG)-coated Gd-doped zinc oxide (ZnO) nanoparticles were prepared by the one-pot solvothermal method. X-ray diffraction (XRD) measurements indicated that all samples had a wurtzite structure. The size of could be controlled to approximately 15 nm. Magnetization using superconducting quantum interference device (SQUID) magnetometer saturation magnetization was enhanced Gd doping. Local structure analysis absorption fine (XAFS) revealed presence oxygen...
In recent years, spintronics has attracted much attention due to the charge and spin properties of electrons. Zinc oxide (ZnO) is known as a wide bandgap semiconductor with high exciton binding energy. our study, we have prepared diluted magnetic semiconductors by doping into ZnO nanoparticles 3d transition metals. this aimed prepare higher Gd, which seven unpaired electrons among 4f rare earth The local structures samples were analyzed X-ray absorption fine structure (XAFS) measurements,...
ポリエチレングリコール (PEG) の特性を活かし, タンパク質吸着を抑制する生体適合性表面を構築するため, 金基盤表面にPEGブラシ界面を作成するための分子設計, そのブラシ密度の制御と最適化を行った。従来, メルカプト基による単点型の金修飾では大気中室温下, 分子修飾表面の劣化による機能低下が解決すべき問題であった。そこで, ピリジン (Py) ユニットの多点吸着によって長期安定な金基板修飾を可能とするPy-PEGグラフト共重合体を合成した。高分子はメタクリロイルPEGマクロモノマーとメタクリロイルピリジンモノマーとの共重合比を任意に変化させた共重合体を合成し, PEGブラシ界面構築の最適化を行った。また, 界面物性は本グラフト共重合体の有する親水-疎水の両親媒バラジスぼよって決定されるため, ミセル形成能力などの溶液物性との相関を調べた。
For heavy-duty gas-turbine engines, one of the promising approaches to reducing NOX emissions is adoption lean premixed combustion. This technique could be combined with conventional exhaust gas recirculation (EGR). However, reduction in oxygen concentration will influence burning velocity and reaction zone characteristics flame. To elucidate this effect, study, we measured flame temperature OH distributions for various concentrations instantaneously simultaneously using laser imaging...