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Mituru Inada

Bio: Mituru Inada is an academic researcher from Kansai University. The author has contributed to research in topics: Inductor & Magnetization. The author has an hindex of 1, co-authored 6 publications receiving 4 citations.

Papers
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TL;DR: In this article, the reduction in the skin effect for the sintered Si nanopolycrystalline body as an electricity conductor at a high frequency due to its nano-structure was studied.
Abstract: Reduction in the skin effect for the sintered Si nanopolycrystalline body as an electricity conductor at a high frequency due to its nano-structure was studied. Singular vanishing of electrical resistances near a local high magnetic harmonic frequency of a few MHz was observed. This phenomenon has not been observed for conventional ferromagnetic metals. The measured electrical resistances changed to almost 0 m{\Omega} at room temperature. At the same time, negative resistance of the sintered Si nano-polycrystalline body was observed. It will be applicable to electronic transmittance lines or semiconductors. Numerical calculation was also performed on the electrical resistance with frequency dependency while considering the electric field and magnetic field in the sintered Si nanopolycrystalline body. The calculation could explain the variation of the relative permittivity of the Si nanopolycrystalline and the phenomenon for vanishing the resistivity at frequency of MHz theoretically. Reduced Si nanoparticles from SiO2 powder were synthesized by laser ablation in liquid. A Si nano-polycrystalline body made of the reduced Si nanoparticles was fabricated. It was found by measuring the magnetization property of the body that the sintered Si nano-polycrystalline body has ferromagnetism. High-density dangling bonds cause the sintered Si nanopolycrystalline to have ferromagnetism. In this study, the density of the unpaired electrons in the sintered Si nanopolycrystalline was observed using ESR. It has been clarified that the Si nanopowder and the sintered Si nanopolycrystalline have numerous dangling bonds. Both densities of the dangling bonds were evaluated.

1 citations

Proceedings ArticleDOI
14 May 2017
TL;DR: In this article, an inductor core inductor with an aluminum nano-polycrystalline structure, which is a ferromagnetic body, for the first time was fabricated.
Abstract: We fabricated core inductors with an aluminum nano-polycrystalline structure, which is a ferromagnetic body, for the first time. Al nano-polycrystalline structure using Al nanoparticles synthesized by pulse laser worked as inductor cores at 5-MHz frequency.

1 citations

Journal ArticleDOI
Taku Saiki1, T. Matsuzaki1, Tatsuya Yasuki1, T. Nakaya1, Mituru Inada1 
TL;DR: In this paper, the magnetization property of the core inductor at the direct current was investigated and it was shown that Fe nanoparticles were produced from iron oxide particles by high voltage pulse or laser ablation in liquids.
Abstract: Iron (Fe) nano-polycrystalline metal obtained by sintering reduced iron nanoparticles from iron oxide was applied to an axial flux generator. When the thickness of the core material is 1/10, it has the same ability of the power generation as when Fe bulk is used as the core. We can also reduce the iron loss (hysteresis loss and eddy current loss), which enables the construction of thin and axial flux generators with light weight. We investigated the magnetization property of the core inductor at the direct current and found that Fe nanoparticles were produced from iron oxide particles by high voltage pulse or laser ablation in liquids. Core inductors with these materials were fabricated. It has been clarified from measurements of the core inductor magnetization that the relative permeability of the sintered Fe nanopolycrystalline was one million.

1 citations

Posted Content
01 Oct 2019-viXra
TL;DR: In this article, reduced iron nanoparticles and sintered Fe nano-polycrystalline were used for axial-gap generator core inductor at low frequency to investigate the magnetization properties of axial gap generator.
Abstract: Reduced iron (Fe) nanoparticles and sintered Fe nano-polycrystalline were used for core inductor of axial-gap generator. Property on magnetization of core inductor at low frequency was investigated. Reduced Fe nanoparticles were produced from iron oxide fine particles by high voltage pulse or laser ablation in liquids. Core inductors with these materials were fabricated. It was clarified from the measurement for magnetization of core inductor that the relative permeability of the sintered Fe nano-polycrystalline was 1 million. These experiments show that core inductor can be thinner and lighter than those using conventional core materials. Using Fe nano-polycrystalline should make axial-gap generator more compact with keeping high efficiency.

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Journal ArticleDOI
01 Mar 2021-Silicon
TL;DR: In this paper, Magnesiothermic reduction was used to transform Tunisian silica sand into crystalline metallurgical silicon nanopowder by Magnesio-reduction process.
Abstract: Crystalline metallurgical silicon nanopowder was successfully produced from Tunisian silica sand by magnesiothermic reduction. Silica sand was first transformed into silica powder via a specific chemical process. The produced silica powder was reduced by magnesium granules at a temperature range of 500–800 °C. Thermal analysis shows that a low-temperature ramp rate (5 °C min−1) allows the initiation of a solid-state reaction at around 528 °C. X-ray diffraction shows that the produced mixture is the result of a rather complex reaction leading to the formation of Si, and other by-products such as MgO, Mg2Si, and Mg2SiO4. In order to remove the by-products, a two-steps leaching approach was used. After leaching, Si with a rate exceeding 99% was obtained. SEM images show that the produced silicon powder is composed of macro and microporous silicon crystallites having an average size dimension of about 47 nm. The porosities of the produced metallurgical silicon particles are resulting from the nature of the magnesio-reduction process. Raman investigations confirm that the resulted metallurgical silicon powder is essentially composed of silicon nanoparticles–based porous matrix. A comparison of the Fourier Infrared Spectroscopy spectrum of the produced metallurgical silicon powder with slightly doped solar grade silicon shows that both products exhibit a bulk Si-Si stretching vibrational mode at around 619 cm−1. These results show that pure porous and crystalline silicon powder can be easily produced at low energy cost from an abundant local and low-cost raw material.

14 citations

Book ChapterDOI
01 Jan 2022
TL;DR: In this article , the types and composition of rice waste, the various process involved in the production of sustainable nanomaterials and their applications in biological and biomedical, environmental, and agri-food sectors was discussed.
Abstract: Rice waste is one of the agricultural wastes that increased every year. Consequently, rice waste is ideal renewable resources for the production of nanomaterials as a substitute for harmful chemicals. Thus, a researcher in the major rice-producing areas developed eco-friendly sustainable perspective to replace the common practices for rice waste Management. Furthermore, the researcher needs to understand that rice waste assisted fabrication is a cost-effective, eco-friendly sustainable nanoparticle. The chapter considers the types and composition of rice waste, the various process involved in the production of sustainable nanomaterials and their applications in biological and biomedical, environmental, and agri-food sectors was discussed.

2 citations

Posted Content
TL;DR: In this article, the reduction in the skin effect for the sintered Si nanopolycrystalline body as an electricity conductor at a high frequency due to its nano-structure was studied.
Abstract: Reduction in the skin effect for the sintered Si nanopolycrystalline body as an electricity conductor at a high frequency due to its nano-structure was studied. Singular vanishing of electrical resistances near a local high magnetic harmonic frequency of a few MHz was observed. This phenomenon has not been observed for conventional ferromagnetic metals. The measured electrical resistances changed to almost 0 m{\Omega} at room temperature. At the same time, negative resistance of the sintered Si nano-polycrystalline body was observed. It will be applicable to electronic transmittance lines or semiconductors. Numerical calculation was also performed on the electrical resistance with frequency dependency while considering the electric field and magnetic field in the sintered Si nanopolycrystalline body. The calculation could explain the variation of the relative permittivity of the Si nanopolycrystalline and the phenomenon for vanishing the resistivity at frequency of MHz theoretically. Reduced Si nanoparticles from SiO2 powder were synthesized by laser ablation in liquid. A Si nano-polycrystalline body made of the reduced Si nanoparticles was fabricated. It was found by measuring the magnetization property of the body that the sintered Si nano-polycrystalline body has ferromagnetism. High-density dangling bonds cause the sintered Si nanopolycrystalline to have ferromagnetism. In this study, the density of the unpaired electrons in the sintered Si nanopolycrystalline was observed using ESR. It has been clarified that the Si nanopowder and the sintered Si nanopolycrystalline have numerous dangling bonds. Both densities of the dangling bonds were evaluated.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the qualitative analysis of high grade nanosilicon obtained from coastal landform in Ese Odo Local Government Areas of Ondo State, Nigeria was conducted.
Abstract: The research focused on the qualitative analysis of high grade nanosilicon obtained from coastal landform in Ese Odo Local Government Areas of Ondo State, Nigeria. The landform in the study areas were noted to possess different colours with appearances and physical presentation presumably of silicon content. The Silicon from the landform were obtained using magnesium as a reducing agent. The results of the energy dispersive x-ray (EDX) analyses of the samples ball-milled for 24 hours revealed that silicon has the highest percentage of all the elements observed in the spectra. The morphology of nanosilicon from Pekehan revealed the presence of agglomeration of irregular shaped particles with average particles sizes of 50.27 nm while Igbekebo and Oju-ala coastal landforms showed the presence of agglomerated ovoid shape with average particle sizes of 54.25 nm and 53.52 nm respectively. The X-ray Diffraction (XRD) spectral of the nanosilicon shows sharp distinct peaks which indicate crystalline nature of the samples. Based on the results obtained, it can be concluded that, the percentage of nanosilicon values obtained ranges between 68.85% to 73.03% which are relatively high enough and can find suitable industrial applications in sectors like the lithium-ion battery, biomedical devices, photovoltaic/solar cell and computer industries etc.