Satoshi Kurumi

Development of a mass spectrometer using two rotating electric fields

The authors propose a new principle for a mass analyzer involving a pair of rotating electric fields (REFs). Its design is reviewed from the perspectives of electronics, ion optics, and operating principle. The use of REFs to separate ions by mass was demonstrated by introducing a Ga focused-ion-beam column directly into the REFs optical system. By optimizing the system phase contrast, the 69Ga+ ions were made to converge to the central axis while the 71Ga+ formed an annular pattern. Asymmetries in annular patterns are caused by nonuniformity in the alternating current voltage of each REF electrode. By varying the frequency, the locations of the 69Ga+ and 71Ga+ projections can be exchanged between the center and exterior.

Optical effect on the growth of Ni-filled carbon nanotubes using gas/solid interfacial discharge pyrolysis

We report on a growth technique of carbon nanotubes (CNTs) whose core and interlayer spaces were filled with Ni fine particles using discharge pyrolysis at gas/solid interface with optical-parametric-oscillation (OPO) laser beam assist. Transmission electron microscope observation reveals that CNTs were grown at around a cathode spot and, in most cases, Ni fine particles had 3–4 nm diameters. With decreasing the wavelength of OPO laser, G/D ratios obtained from Raman spectrum analysis increased gradually and, in fact, the structures of CNTs were improved from amorphous-like structures to the long and straight CNTs. For longer wavelengths (593 nm, 650 nm) of OPO laser, diameters of CNTs became thicker (typically 10 ~ 100 nm) and therefore, Ni nanowires were formed in the core spaces of CNTs. However, for shorter wavelength (456 nm, 507 nm), diameters of CNTs were significantly reduced and Ni fine particles were embedded in between CNT layers. It was found that the structures of CNTs strongly depend on both...

Micro-Inactivation of Coliforms by Low-Temperature and Atmospheric-Pressure Plasma Irradiation

In this study, we report on the inactivation technique to apply the oral surgery by micro low-temperature and atmospheric-pressure plasma irradiation utilizing a capillary nozzle. Emission spectrum of the micro-plasma showed OH and O radical, which were affected inactivation of coliform. Vibration temperature of the micro-plasma with 7998 K was calculated from peak-intensity at emission due to N2 2nd positive system. Inactivation region was larger than plasma irradiation spot, and it was increasing with plasma irradiation time.

Synthesis of Carbon Nanostructure Filled with Phase-separating Stainless Alloy by Liquid and Solid Interfacial Arc Discharge Method

We report on the synthesis of new type of carbon nanostructure filled with metal structure which is austenitic stainless alloy with separation of phase by liquid and solid interfacial arc discharge method. The transmission electron microscopy and nano-beam electron diffraction and energy-dispersive X-ray spectroscopy reveal that the structure of the synthesized carbon nanostructure possessed 3 phases which indicate that single-crystal of Fe2-xCrxO3 at tip part, multi-crystal of Fe2-xCrxO3 at middle part and single-crystal of Fe1-xCrx at root part.

Micro-Biocidal Activity of Yeast Cells by Needle Plasma Irradiation at Atmospheric Pressure

In this study, we report on the biocidal activity technique by needle helium plasma irradiation at atmospheric pressure using borosilicate capillary nozzle to apply for the oral surgery. The diameter of needle plasma was less than 50 m, and temperature of plasma irradiated area was less than body temperature. Needle plasma showed emission due to OH and O radical. Raman spectra and methylene blue stain showed yeast cells were inactivated by needle plasma irradiation.

Application of Coaxial Ion Gun for Film Generation and Ion Implantation

A magnetized coaxial plasma gun (MCPG) is here utilized for deposition on high-melting-point metals. MCPGs have hitherto been studied mostly in the context of nuclear fusion research, for particle and magnetic helicity injection and spheromak formation. During spheromak formation, the electrode materials are ionized and mixed into the plasmoid. In this study, this ablation process by gun-current sputtering is enhanced for metallic thin-film generation. In the proposed system geometry, only ionized materials are electromagnetically accelerated by the self-Lorentz force, with ionized operating gas as a magnetized thermal plasmoid, contributing to the thin-film deposition. This reduces the impurity and non-uniformity of the deposited thin-film. Furthermore, as the ions are accelerated in a parallel direction to the injection axis, vertical implantation of the ions into the substrate surface is achieved. To test a potential application of the developed system, experiments were conducted involving the formation of a buffer layer on hard ceramics, for use in dental materials.

Synthesize of SrxLa1-xTiO3 Visible Light Responces Photocatalyst Films for the Water-Splitting Reaction by Pulsed Laser Deposition

This In this study, we report on the growth techniques of SrxLa1-xTiO3 visible-light responses photocatalytic films by pulsed laser deposition for the H2 gas generation system as the fuel cell devices. XRD profile showed SrTiO3 peaks were obtained at the all films. Bandgap energy of films were decreaed with increasing the La ratio from 3.2 eV to 2.9 eV. Water splitting reaction were observed at the all films, and the maximum value of the gas generation was 7.3 μmol/cm2h at x = 0.7 film.document explains and demonstrates how to prepare your camera-ready manuscript for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. The text area for your manuscript must be 17 cm wide and 25 cm high (6.7 and 9.8 inches, resp.). Do not place any text outside this area. Use good quality, white paper of approximately 21 x 29 cm or 8 x 11 inches (please do not change the document setting from A4 to letter). Your manuscript will be reduced by approximately 20% by the publisher. Please keep this in mind when designing your figures and tables etc.

Generation of Uniform Diameter Micro-Bubbles Using a Piezo-Vibration Assisted Capillary Nozzle

In this study, we generated the uniform diameter micro-bubbles using a piezo-vibration assisted capillary nozzle for apply the nano/micro bubbles device use. The capillary nozzle (diameter: 35 μm) was fabricated by FIB technique, and attached with piezo-device as micro bubbles generator. The fabricated piezo-nozzle showed inflective movement, whose displacement amount was about 3 μm. Micro bubbles were not able to generate from capillary nozzle without piezo-vibration, while micro bubbles, whose diameter was in the range of 20 μm to 21 μm, could be generated from the capillary nozzle with piezo-vibration.

Hydrogen effect on characteristics of the resistive switching memory

Hydrogen anneal effects on reproducibility of the switching voltages for a resistive switching memory using anodic porous alumina have been investigated. The hydrogen anneal made the reproducibility worse.