A5060833210- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Tribology and Wear Analysis
- Semiconductor materials and devices
- High-Temperature Coating Behaviors
- Lubricants and Their Additives
- Luminescence Properties of Advanced Materials
- Advanced materials and composites
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Polymer Surface Interaction Studies
- Advanced ceramic materials synthesis
- Catalytic Processes in Materials Science
- Silicone and Siloxane Chemistry
- Solid-state spectroscopy and crystallography
- Flame retardant materials and properties
- Material Properties and Applications
- Advanced Surface Polishing Techniques
- Carbon Nanotubes in Composites
- Hydrogen Storage and Materials
- Boron and Carbon Nanomaterials Research
- Supercapacitor Materials and Fabrication
- Ion-surface interactions and analysis
- Glass properties and applications
- Aluminum Alloys Composites Properties
Tokyo Institute of Technology
2016-2025
Institute of Science Tokyo
2025
Nagaoka University of Technology
2003-2018
Nagaoka University
2009-2014
Hoshi University
2000
Nippon Koei (Japan)
1985
Hydrogenated amorphous carbon (a-C:H) films have optical and electrical properties that vary widely depending on deposition conditions; however, the conduction mechanism, which is dependent film structure, has not yet been fully revealed. To understand relationship between structure three types of a-C:H were prepared their structures evaluated. The sp2/(sp2 + sp3) ratios measured by a near-edge X-ray absorption fine technique. From conductivity–temperature relationship, variable-range...
Diamond-like carbon (DLC) material is used in blood contacting devices as the surface coating because of antithrombogenicity behavior which helps to inhibit platelet adhesion and activation. In this study, DLC films were doped with boron during pulsed plasma chemical vapor deposition (CVD) improve compatibility. The ratio (B/C) was varied from 0 0.4 film by adjusting flow rate trimethylboron acetylene. Tribological tests indicated that doping a low B/C 0.03 beneficial for reducing friction...
Abstract Positron annihilation spectroscopy was used to investigate vacancy-type defects in diamond-like carbon (DLC) films. From Doppler broadening measurements of the γ -rays produced by and positron lifetime (PAL) using a slow beam on DLC films deposited various deposition methods conditions, it found that there is good correlation between S parameter obtained PAL. The result PAL correlates well with film density hardness, indicating can be as an indicator these properties. hydrogen...
The relationship of the detailed structural change KOH activated carbon and hydrogen storage ability was investigated in materials fabricated from waste coffee beans. specific surface area porous calculated N2 adsorption isotherms stood at 2070 m2/g when weight ratio to 5:1, pore size range approximately 0.6 1.1 nm as micropores. In analysis, X-ray diffraction analysis Raman spectroscopy indicated these through activation. order graphite structure changed a smaller scale with this It is...
Abstract We have successfully conceived and demonstrated a simple, scalable process for improving the fracture energy of epoxy resins. The is based on combined application high pressures (in order GPa) shear rates 10 6 s −1 ) in pre-cured polymer, obtaining mechanical forces sufficiently to increase reactivity monomers due scission groups. To achieve these values pressure rate, we take advantage elastohydrodynamic phenomena occurring at lubricated higher kinematic pairs as, example, rolling...
The work function of the amorphous phase hydrogenated carbon nitride (a-CNx:H) was calculated using Fowler–Nordheim field emission. First, metal films were deposited on conductive ZnO:Al whiskers to determine geometric enhancement factor at tip emitter. radius curvature whisker after deposition measured. Next, ceramic metals and emitter tip. Finally, a-CNx:H introduced equation with factor. is dependent upon functional group.
In this work, the thermal stability and oxidation tribological behavior of nanoporous a-BC:H films are studied compared with those in conventional diamond-like carbon (DLC) films. were deposited by pulsed plasma chemical vapor deposition using B(CH3)3 gas as boron source. A DLC interlayer was used to prevent film delamination produced oxidation. Thermal films, no signs after annealing at 500 °C for 1 h, is better than that which completely disappeared under same conditions. Tribological test...
Diamond-like carbon (DLC) films were prepared by dc pulse plasma chemical vapor deposition (CVD). The hydrogen flow ratio [H 2 /(C H +H )] was varied from 0 to 0.75, and the frequency 1 20 kHz. Then, relationship between film structure hardness investigated. At )=0, at 10 kHz have greatest because a further increase in leads an number of regular sixfold ring structures excessive ion peening on growth face. )=0.5 is greater than that )=0 effect are suitable for fabricating hard films. In...
Rapid screening for exploring biocompatible ceramics is important. We demonstrate the detection of lysozyme (Lyz) on a silica surface using custom-made plasmon resonance (SPR) sensor that can detect interaction between and biomolecules. The results expressed as shifts angle SPR followed expected theory when film was synthesized chip. Moreover, adsorption desorption behaviors Lyz hydrophilic or hydrophobic in phosphate buffer solution were investigated. Relatively large amounts molecules...