A5002071573- Carbon Nanotubes in Composites
- Graphene research and applications
- Nanoparticles: synthesis and applications
- Wireless Power Transfer Systems
- Energy Harvesting in Wireless Networks
- Wireless Body Area Networks
- Wireless Networks and Protocols
- Innovative concrete reinforcement materials
- Mobile Ad Hoc Networks
- Mechanical Engineering and Vibrations Research
- RFID technology advancements
- Innovations in Concrete and Construction Materials
- Railway Engineering and Dynamics
- Wireless Communication Networks Research
- Software-Defined Networks and 5G
- Anesthesia and Neurotoxicity Research
- Fullerene Chemistry and Applications
- Electromagnetic Fields and Biological Effects
- Millimeter-Wave Propagation and Modeling
- Nanotechnology research and applications
- IPv6, Mobility, Handover, Networks, Security
- Concrete and Cement Materials Research
- Concrete Properties and Behavior
- Advanced MIMO Systems Optimization
- 3D IC and TSV technologies
NTT (Japan)
2003-2024
Kajima Corporation (Japan)
2023
Hoshi University
2020-2021
Hitachi (Japan)
1990-2020
Ibaraki University
2017-2020
Tohoku University
1976-2020
Kitakyushu National College of Technology
2019
National Institute of Technology
2019
Kansai Electric Power (Japan)
2013-2019
Kyoto University
2012-2015
We demonstrate the efficient chemical vapor deposition synthesis of single-walled carbon nanotubes where activity and lifetime catalysts are enhanced by water. Water-stimulated catalytic results in massive growth superdense vertically aligned nanotube forests with heights up to 2.5 millimeters that can be easily separated from catalysts, providing material purity above 99.98%. Moreover, patterned, highly organized intrinsic structures were successfully fabricated. The water-assisted method...
Among all known materials, we found that a forest of vertically aligned single-walled carbon nanotubes behaves most similarly to black body, theoretical material absorbs incident light. A requirement for an object behave as body is perfectly absorb light wavelengths. This important feature has not been observed real materials because intrinsically have specific absorption bands their structure and composition. We can almost across very wide spectral range (0.2-200 mum). attribute this...
Here we investigate the kinetics of water-assisted CVD (henceforth denoted as supergrowth CVD) by a quantitative time-evolution analysis based on simple growth model. We found that can be well described model where dynamics catalyst activity is treated similar to radioactive decay. An in-depth this revealed CVD, showing scale relationship between carbon source and water, elucidated role water enhancer preserver.
We propose a statistical and macroscopic analysis to estimate the catalyst activity of water-assisted growth (super-growth) single-walled nanotubes (SWNT) characterize SWNT forests. The was estimated be 84% (+/-6%), highest ever reported. forest found very sparse material where SWNTs represent only 3.6% total volume. This structural sparseness is believed play critical role in achieving highly efficient growth.
Multi-walled carbon nanotubes (MWCNTs), dispersed in suspensions consisting mainly of individual tubes, were used for intratracheal instillation and inhalation studies. Rats intratracheally received a dose 0.2 mg, or 1 mg MWCNTs sacrificed from 3 days to 6 months. induced pulmonary inflammation, as evidenced by transient neutrophil response the low-dose groups, presence small granulomatous lesion persistent infiltration high-dose groups. In study, rats exposed 0.37 mg/m3 aerosols...
Biological responses of multi-wall carbon nanotubes (MWCNTs) were assessed after a single intratracheal instillation in rats. The diameter and median length the MWCNTs used this study approximately 60 nm 1.5 μm, respectively. Groups male Sprague–Dawley rats intratracheally instilled with 0.04, 0.2, or 1 mg/kg individually dispersed MWCNT suspension. After instillation, bronchoalveolar lavage fluid was for inflammatory cells markers, lung, liver, kidney, spleen, cerebrum histopathologically...
We investigated the purity and defects of single-wall carbon nanotubes (SWCNTs) produced by various synthetic methods including chemical vapor deposition, arc discharge, laser ablation. The SWCNT samples were characterized using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Raman spectroscopy. Quantitative SEM images suggested that G-band intensity serves as an index for purity. By contrast, ratio to D-band (G/D ratio) reflects both defect density SWCNTs. combination...
The science and technology of carbon nanotubes are very interesting topics in the field nanotechnology. It is considered that such have excellent properties electrical conduction, tensile strength, thermal conduction. However, these not well understood yet. Techniques for handling a nanotube measuring yet been established. Recently, technique synthesizing supergrowth nanotubes, which form highly pure single-walled (SWNT) forest, has developed. These grow to as long millimeter scale. As-grown...
Making use of the programmability and structural flexibility DNA molecule, a DNA-origami nanoarm capable undergoing large deformation is constructed. This comprised serially repeated tension-adjustable modules, cumulative actuation which resulted in arm structure, transformed from linear shape into an arched shape. Combining atomic force microscopy theoretical analyses based on mechanics materials, we demonstrate that degree can be systematically controlled by merely replacing set strands...
The present study was conducted to assess the pulmonary and systemic responses in rats after intratracheal instillation of highly pure, well-dispersed, well-characterized SWCNTs. Exposure SWCNTs up 2 mg/kg did not produce mortality, changes clinical signs, or body weights during observation period. Dose-dependent were observed lung weight, BALF inflammatory cells, biochemical parameters such as LDH value, protein content, IL-1β IL-6 activity, histopathology. In 0.04 SWCNT-exposed group,...
Single-wall carbon nanotubes (SWCNTs) were well-dispersed by ultrasonication to conduct an inhalation study. SWCNTs generated using a pressurised nebuliser with liquid suspension of SWCNTs. Wistar rats exposed the SWCNT (diameter bundle: 0.2 μm; length 0.7 μm) for 4 weeks. The low and high mass concentrations 0.03 ± 0.003 0.13 mg/m3, respectively. sacrificed at 3 days, 1 month, months after end exposure. There no increases total cell or neutrophil counts in bronchoalveolar lavage fluid...
We have studied the compatibility of various catalysts for ethylene and ethanol chemical vapor deposition (CVD) syntheses single-walled carbon nanotubes (SWNTs) on Si substrates. A strong selectivity between catalyst elemental species source was found; SWNT yield Fe (Co) much higher (ethanol) CVD than (ethylene) CVD. This completely opposite implies significantly different growth mechanisms
It is important to conduct a risk assessment that includes hazard and exposure for the safe production handling of newly developed nanomaterials. We conducted an inhalation study multi-wall carbon nanotube (MWCNT) as assessment. Male Wistar rats were exposed well-dispersed MWCNT 4 weeks by whole body inhalation. The concentration in chamber was 0.37 ± 0.18 mg/m3. About 70% MWCNTs single fiber. geometric mean diameter (geometric standard deviation, GSD) length (GSD) aerosolized 63 nm (1.5)...
After disasters such as earthquakes and tsunamis, the network infrastructures might be extremely damaged or destroyed while Internet connection becomes much more necessary. Therefore, deploying networks in disaster areas has received attention especially after great earthquake Japan on March 11, 2011. Among many kinds of networks, Wireless Mesh Network (WMN) is considered one most suitable solutions because it can easily configure a without any wired infrastructure. In our national project...
A number of pilot tests have been done to confirm RFID's performance at the supply chain managements. In these cases, RFID work as bar cord systems that can connect their IDs databases. The passive system has used in meet severe cost requirements. result pointed out some week points tags 1) communication range changes depend on material, 2) reader and antenna pattern make null position, 3) reflection waves come from wall ceiling position. active are expected solve for points. Additionally...
For human ICSI, sperm are normally immobilized immediately prior to injection. However, there some situations when only of questionable viability available. There few evaluations fertilization or developmental problems in animal models using having known intervals between immobilization and injection.Immobilized were maintained for 1-24 h 10% polyvinylpyrrolidone (PVP) before injection into mouse oocytes. Mouse heads similarly either PVP a high potassium-containing 'nucleus isolation medium'...
Abstract We have newly developed non photosensitive and polyimide having excellent electrical/mechanical properties. At first we re-designed the polymer backbone in order to obtain low Dk Df performance. As a result, our new PI achieved 2.9 of at 20 GHz 0.003 GHz. In next step, selected photo package carefully maintain both Dk/Df high resolution. After that, modified initiator content, crosslinker so on lithographic performance electrical photosentive cured 320 °C showed 3.0 0.006 addition,...
AlN was directly grown on a sapphire substrate by the solution growth method with Cu–Si–Al–Ti solvent under nitrogen gas flow. X-ray diffraction measurements revealed that single crystal. The layer epitaxially formed orientation relationships: (0001) ∥(0001) and [1̄100] ∥[112̄0] . full widths at half maximum (FWHMs) of rocking curves for tilt twist components were 414 2031 arcsec, respectively.
CCQM key comparison K-136 Measurement of porosity properties (specific adsorption, BET specific surface area, pore volume and diameter) nanoporous Al 2 O 3 has been performed by the Surface Analysis Working Group (SAWG) Consultative Committee for Amount Substance (CCQM). The objective this is to compare equivalency National Metrology Institutes (NMIs) Designated (DIs) measurement substances (sorbents, catalytic agents, cross-linkers, zeolites, etc) used in advanced technology. In comparison,...