Catalytic CVD generation of high-purity single-walled carbon nanotubes at low temperature (original) (raw)

Grafting of Polymers onto Carbon Nanotubes

NIPPON GOMU KYOKAISHI, 2010

Recent advances in surface grafting of polymers onto nanocarbon materials, such as carbon nanotube CNT and vapor grown carbon nanotube VGCF , are reviewed. The grafting of polymers onto these surfaces was achieved by 1 the grafting onto method and 2 grafting from method. For the grafting of polymers, surface functional groups, such as carboxyl groups, previously introduced onto CNT surfaces by oxidation with nitric acid, were used as grafting sites. The grafting by grafting onto method was carried out by the reaction of the functional groups on CNTs with terminal functional groups of polymers to give polymer-grafted CNTs. Polycondensed aromatic rings graphene of CNT and VGCF were used as grafting sites by using ligand-exchange reaction with polymers containing ferrocene moieties in the presence of AlCl3. The radical trapping activiity of CNT and VGCF surface was successfully used for the grafting of polymers. On the other hand, surface functional groups were converted into various initiating groups and surface initiated graft polymerization was achieved. The grafting of polymers with controlled molecular weight and narrow molecular weight distribution onto CNT by surface initiated living radical polymerization, such as atom transfer radicalpolymerization and nitroxide mediated radical polymerization were summarized.

焼結チタンバルブの開発

DENKI-SEIKO[ELECTRIC FURNACE STEEL], 2001

In October 1998, a new mass-produced car with titanium engine-valves was released from TOYOTA Motor Corporation. Both intake and exhaust valves were manufactured via a newly developed cost-effective P/M forging process. Furthermore, the material which was specially designed for the exhaust one is a unique TiB reinforced titanium metal matrix composite (MMC). This paper discusses the materials and manufacturing methods used. The tensile, fatigue strength and creep resistance of the developed MMC are always superior to those of the typical heat-resistant steel of 21-4N.

Field Emission Current and Electrical Breakdown by a Pointed Cathode Coated with Carbon-Nano-Tube

Journal of High Temperature Society, 2005

Feature of field emission current and electrical breakdown was experimentally investigated for very short gap in the range of 0.1 µ m to 3 µ m between a pointed cathode coated with Carbon-Nano-Tube (CNT) and a plane anode in vacuum environment. The experimental setup, which consists of the CNT coated cathode, the stainless steel anode and the precise positioning mechanisms actuated by piezoelectric devices, was installed in scanning electron microscope (SEM). The pointed cathode coated with CNT was confirmed to emit electrons by field emission through F-N plots of voltage and current between both electrodes. The minimum voltage required for detecting field emission current decreases with decrease of gap length. The breakdown voltage was higher than the minimum voltage for emission current when the gap length was kept constant.

Low-temperature Deposition of SiCN Thin Films by RF Plasma CVD Method

IEEJ Transactions on Fundamentals and Materials, 2014

We deposited SiCN thin films by RF plasma CVD (Chemical Vapor Deposition) method using a mixture of Tetramethylsilane (TMS), nitrogen, and hydrogen gas. Deposited films were measured some properties with Fourier-Transform Infrared Spectroscopy (FT-IR), X-ray Photoelectron Spectroscopy (XPS), Ellipsometry and Atomic Force Microscope (AFM). We found that the temperature of substrate increased elimination and absorption reaction on the surface, and a fine film could be deposited at the temperature of 973K. To deposit SiCN with lower temperature, we changed H2 flow rate. As results, we found that H2 flow rate had great influence on the efficiency of decomposition of TMS. Moreover, the roughness of substrate was affected by the mixture rate of TMS. We could obtain the films nearly similar to the 973K ones at the state of 100Pa of pressure, 773K of substrate temperature, 80sccm of H2 flow rate, and TMS mixture rate of 3% to 5%. In particular, 5% of TMS mixture rate could be considered as the best condition on this experiment.

P-10 バイオ合成ガスの多段型乾式脱硫プロセスに資する高温ガス精製(熱分解・ガス化,ポスター発表)

2016

The hi 帥 一 temperature removal of sulphur from biomass − gasi 丘cation − derived synthesis − gas (bio − syngas) ushlg nickel oxide sirpported by calcium alum血 1ate (NiOICaAl204) was 血 ves 缸 gated with 血 e objective to desUlphurise bio − sy 皿 gas Via utilisation of the sensible lleat cascade ， which is maintained at the temperatUre of the gasifier ． 血 this study 」 the