Aichi Center for Industry and Science Technology

Kariya, Japan

Aichi Center for Industry and Science Technology

Kariya, Japan
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Sasaki Y.,Japan Fine Ceramics Center | Yoshida Y.,Aichi Center for Industry and Science Technology | Fisher C.A.J.,Japan Fine Ceramics Center | Ikeda T.,Japan National Institute of Advanced Industrial Science and Technology | And 3 more authors.
Microporous and Mesoporous Materials | Year: 2016

Design of efficient and environmentally benign zeolitic materials at the nanoscale is becoming increasingly important for a range of industrial applications. Here we report a high resolution transmission electron microscopy investigation of the atomic level structure of zeolite beta synthesized without an organic structure-directing agent (OSDA). Direct visualization of zeolite beta crystals confirmed them to be essentially defect free, with domain boundaries the only disruption to the pore channel network. Direct visualization enabled the distribution of BEA and BEB polytype subdomains to be quantified, and the overall abundance ratio was calculated to be BEA:BEB = 9:11. By assuming this ratio corresponds to the probability of forming a new BEA or BEB layer on a (001) surface at the tip of a crystal, the experimentally observed polytype distributions can be described by a simple probability function, suggesting that epitaxial crystal growth occurs stochastically in a state close to chemical equilibrium. © 2015 Elsevier Inc. All rights reserved.


Mizutani T.,Nagoya University | Ogawa S.,Nagoya University | Murai T.,Aichi Center for Industry and Science Technology | Nameki H.,Aichi Center for Industry and Science Technology | And 2 more authors.
Applied Surface Science | Year: 2015

Gold nanoparticles are prepared in various concentrations of NaCl solutions by solution plasma sputtering. The absorption spectra of these solutions during and after the plasma process are measured by in situ ultraviolet-visible (UV-vis) spectroscopy to estimate the particle diameters and concentrations of gold. The distributions of particle diameters are obtained by transmission electron microscope (TEM) observations. These experiments indicate the gold nanoparticles with about 2.2 nm are directly formed by plasma phase and the diameters are increasing over time. These increases of particle diameters are caused by Ostwald ripening of gold nanoparticles in NaCl solution. We estimate the equilibrium diameter at which the gold nanoparticles are not solved in NaCl solution using in situ UV-vis spectroscopy. These diameters are about 5, 7 and 10 nm in 3, 5 and 10 mM NaCl solution, respectively. We make it possible to control the diameter of gold nanoparticles prepared by solution plasma sputtering in NaCl solution. © 2015 Elsevier B.V. All rights reserved.


Mabuchi Y.,Nagoya Institute of Technology | Itoigawa F.,Nagoya Institute of Technology | Nakamura T.,Nagoya Institute of Technology | Kawata K.,Aichi Center for Industry and Science Technology | Suganuma T.,Takahiro Engineering Works Ltd.
Key Engineering Materials | Year: 2015

Precision grinding is one of the important processes for finishing of hardened steel parts. However, the grinding process might be quite costly providing the parts with shape complexity should be finished because a number of production steps are needed. Also, this process has some environmental issues, such as disposal of a large amount of grinding sludge and grinding fluid. Precision cutting would become a better alternative process to reduce cost and environmental burden because process steps can be simplified by use of CNC machine tools with PcBN cutting insert if deterioration of cutting tool edge by wear and chipping can be suppressed for long duration. In this study, to improve performance of a PcBN cutting insert, such as wear resistance and defect resistance by the applying of pulse laser processing to sharpen cutting edge in order to realize substitution of cutting for grinding. Precision cutting experiments for hardened steel are conducted by use of the PcBN insert with sharp and tough edges processed by pulsed laser and, for comparison, by use of the PcBN insert ground with diamond wheel. From the results of cutting experiments, it was found that precision cutting with PcBN insert processed by pulsed laser can provide a steady cutting state for a long cutting duration, and a smooth finished surface comparable to precision grindings. © (2015) Trans Tech Publications, Switzerland.


Hirayama T.,Doshisha University | Suzuki T.,Japan Science and Technology Agency | Itoigawa F.,Nagoya Institute of Technology | Kawata K.,Aichi Center for Industry and Science Technology | Kodama H.,Aichi Center for Industry and Science Technology
Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 | Year: 2015

Rotary cutting has been attracting much attention because of its excellent machining performance due to the efficient supply of lubricant into the cutting point. To clarify the lubrication mechanism for friction reduction between the textured rotary tool and chip, the lubrication analysis on the Reynolds equation and Green wood-Williamson model was conducted. The experimental and analytical results showed that the surface texturing with deep groove depth over 2 μm did not work to generate hydrodynamic pressure, and thus was not effective with any groove angles. On the other hand, the surface texturing with shallow groove depth, around 200 nm, worked to generate high hydrodynamic pressure, and was most effective for friction reduction during the cutting process.


Nishida M.,Nagoya Institute of Technology | Ichihara H.,Nagoya Institute of Technology | Watanabe H.,Nagoya Institute of Technology | Fukuda N.,Aichi Center for Industry and Science Technology | Ito H.,Industrial Research Center
Engineering Transactions | Year: 2012

Poly(lactic acid) (PLA) and poly(butylene adipate/terephthalate) (PBAT) were used for polymer alloys, and the effects of the mixing ratio of PLA and PBAT and the addition of dialkyl peroxide (compatibilizing agent) were examined. The stress-strain curves of PLA/PBAT and PLA/PBAT/dialkyl peroxide specimens were measured using a tensile split Hopkinson bar (Kolsky Bar) method and a universal testing machine. The mixing ratio of PLA and PBAT and the dialkyl peroxide addition affected the shape of the stress-strain curve behavior. Regardless of the strain rate, the yield stress decreased and the elongation at break and strain energy increased with increasing PBAT content when the dialkyl peroxide was used. At high strain rate, the dialkyl peroxide addition increased the elongation at break and the strain energy, and changed the fracture surface to a whitened form that was markedly uneven. This result could explain the improvement in the Izod impact strength.


Nishida M.,Nagoya Institute of Technology | Ichihara H.,Nagoya Institute of Technology | Watanabe H.,Nagoya Institute of Technology | Fukuda N.,Aichi Center for Industry and Science Technology | Ito H.,Owari Textile Research Center
International Journal of Impact Engineering | Year: 2015

Stress-strain curves of poly(lactic acid)/Poly(butylene adipate-co-terephthalate) polymer alloys (80/20, 70/30, 60/40, 50/50, 30/70) were measured using the tensile split Hopkinson bar method. The effects of mixing ratio and crosslinking agent addition on Young's modulus, maximum stress, elongation at break and dissipated work were examined. The crosslinking agent addition significantly increased elongation at break when the mixing ratio was 50/50 and 30/70. The results were compared with the results of Izod impact tests which measure the fracture toughness of materials. The tensile behavior of specimens during dynamic tensile tests was observed using a high speed video camera. The deformation of the gage area was major. The results of Young's modulus, maximum stress, and elongation at break were compared with the mixture laws of composite materials. The fracture mechanism of the specimens was discussed using observation of the fracture surfaces of the tensile test specimens. When the crosslinking agent was not used, it seemed that the fracture occurred along an interface between the PLA-rich region and the PBAT-rich region. © 2014 Elsevier Ltd. All rights reserved.


Nishida M.,Nagoya Institute of Technology | Natsume R.,Nagoya Institute of Technology | Fukuda N.,Aichi Center for Industry and Science Technology | Ito H.,Owari Textile Research Center
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2015

Polyamide 11 (PA11) is one of bioplastics (plant-derived plastics or recyclable-resource-based plastics). It is produced from renewable castor seeds. The castor seeds are inedible. This point is important due to the future food insecurity. In order to increase Young's modulus, in the present study, silica nanoparticles were added to PA11. The effects of the addition of silica nanoparticles and the surface treatment of nano silica particles on the stress-strain curves of PA11-based polymer composites at high strain rates were examined. After dynamic tensile tests, the fracture surfaces of the specimens were observed. © The Society for Experimental Mechanics, Inc. 2015.


Nishida M.,Nagoya Institute of Technology | Ichihara H.,Nagoya Institute of Technology | Watanabe H.,Nagoya Institute of Technology | Fukuda N.,Aichi Center for Industry and Science Technology | Ito H.,Industrial Research Center
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2013

Polymer alloys of poly(lactic acid) (PLA) and poly(butylene adipate/terephthalate) (PBAT) were used, and the effects of the mixing ratio of PLA and PBAT and the addition of dialkyl peroxide (compatibilizing agent) were examined. The stress-strain curves of PLA/PBAT and PLA/PBAT/dialkyl peroxide specimens were measured using the tensile split Hopkinson pressure bar (Kolsky Bar) method. The mixing ratio of PLA and PBAT and the dialkyl peroxide addition affected the stress-strain curve behavior. The dialkyl peroxide addition increased the elongation at break and changed the fracture surface to a whitened form that was markedly uneven. The elongation at break increased with increasing PBAT content. © The Society for Experimental Mechanics, Inc. 2013.


Yu X.,Nagoya Institute of Technology | Endo M.,Aichi Center for Industry and Science Technology | Ishibashi T.,NTT Electronics | Shimizu M.,NTT Electronics | And 3 more authors.
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2016

A terahertz imaging system operating at 0.3 THz has been developed for the purpose of detecting foreign substances in foods conveyed at a velocity of higher than 20 m/min. The imaging system has two Schottky barrier diode arrays which detect horizontally and vertically polarized terahertz waves independently and simultaneously. Experiments have shown that the imaging system can successfully obtain THz images with a diffraction limited resolution of 1 mm. It has also been shown that addition or subtraction of two images taken with perpendicularly polarized waves is effective to enhance the contrast of terahertz images. © 2015 IEEE.


Nakaya T.,Gifu National Institute of Technology | Yamasaki M.,Nagoya University | Fukuta S.,Aichi Center for Industry and Science Technology | Sasaki Y.,Nagoya University
Forest Products Journal | Year: 2016

Using wooden waste as insulation material benefits society by using waste products, reducing building thermal load, an sequestering carbon dioxide. In this study on heat insulating materials, a novel low-density wooden mat was fabricated fro wood shavings and kenaf fibers. This research addressed the influences of fabrication conditions on the thermal conductivit and volumetric specific heat of the materials used. The raw materials (wood shavings and kenaf fibers) were mixed with binder component, and the mixture was thermoformed. The thermal conductivity and volumetric specific heat of the mat were measured, and the influence of mixing ratio, density, and heat flux was evaluated. The results demonstrated that therma conductivity was largely affected by the mat density and mixing ratio but was largely unaffected by changes in the heat flux The volumetric specific heat of the mats was largely unaffected by the raw material mixing ratio but was greatly affected b the mat density. The tendency of the thermal conductivity decrease was changed according to the combination ratio of th wood shavings and the kenaf. The wood shavings are flake shaped and curled, and the kenaf is fibrous. It was thought that th internal void was made smaller effectively by mixing two different shaped fibers and the thermal conductivity wa minimized. As a result, the thermal performance of the subject mats, as compared with glass wool, exhibited a slightly lowe thermal insulation level and higher heat capacity. The results are important in improving efficiency and the commercia design of insulation materials. © Forest Products Society 2016.

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