Shimane Institute for Industrial Technology

Matsue-shi, Japan

Shimane Institute for Industrial Technology

Matsue-shi, Japan
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Nishimoto N.,Shimane Institute for Industrial Technology | Fujihara J.,The University of Shimane | Yoshino K.,Shimane Institute for Industrial Technology
Applied Surface Science | Year: 2017

GaSb may be suitable for biological applications, such as cellular sensors and bio-medical instrumentation because of its low toxicity compared with As (III) compounds and its band gap energy. Therefore, the biocompatibility and the film properties under physiological conditions were investigated for GaSb thin films with or without a surface coating. GaSb thin films were grown on quartz substrates by RF magnetron sputtering, and then coated with (3-mercaptopropyl) trimethoxysilane (MPT). The electrical properties, surface morphology, and crystal structure of the GaSb thin film were unaffected by the MPT coating. The cell viability assay suggested that MPT-coated GaSb thin films are biocompatible. Bare GaSb was particularly unstable in pH9 buffer. Ga elution was prevented by the MPT coating, although the Ga concentration in the pH 9 buffer was higher than that in the other solutions. The surface morphology and crystal structure were not changed by exposure to the solutions, except for the pH 9 buffer, and the thin film properties of MPT-coated GaSb exposed to distilled water and H2O2 in saline were maintained. These results indicate that MPT-coated GaSb thin films are biocompatible and could be used for temporary biomedical devices. © 2017 Elsevier B.V.

Tashiro T.,University of Tokyo | Dougakiuchi M.,Shimane Institute for Industrial Technology | Kambara M.,University of Tokyo
Science and Technology of Advanced Materials | Year: 2016

Nanocomposite SiOx particles have been produced by a single step plasma spray physical vapor deposition (PS-PVD) through rapid condensation of SiO vapors and the subsequent disproportionation reaction. Core-shell nanoparticles, in which 15 nm crystalline Si is embedded within the amorphous SiOx matrix, form under typical PS-PVD conditions, while 10 nm amorphous particles are formed when processed with an increased degree of non-equilibrium effect. Addition of CH4 promotes reduction in the oxygen content x of SiOx, and thereby increases the Si volume in a nanocomposite particle. As a result, core-shell nanoparticles with x = 0.46 as anode exhibit increased initial efficiency and the capacity of lithium ion batteries while maintaining cyclability. Furthermore, it is revealed that the disproportionation reaction of SiO is promoted in nanosized particles attaining increased Si diffusivity by two orders of magnitude compared to that in bulk, which facilitates instantaneous composite nanoparticle formation during PS-PVD. © 2016 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis.

Tsurunaga Y.,The University of Shimane | Takahashi T.,The University of Shimane | Katsube T.,Shimane Institute for Industrial Technology | Kudo A.,Panasonic | And 3 more authors.
Food Chemistry | Year: 2013

The effects of various light compositions on the levels of anthocyanin, rutin and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity in buckwheat (Fagopyrum esculentum Moench) sprouts were evaluated. Dark-grown 6-day-old buckwheat sprouts were irradiated with different sources of visible and ultraviolet (UV) light. Particularly, we examined the effect of UV-B at wavelengths of 260-320 nm, 280-320 nm, and 300-320 nm on the production of flavonoid compounds, using multiple fluorescent lights and cylinders that filter out certain portions of the UV-B. The results showed that irradiation with UV-B > 300 nm increased the levels of anthocyanin and rutin, as well as the DPPH radical scavenging activity. When sprouts were irradiated with UV-B light at wavelengths of 260-300 nm, yellowing or withering occurred within 24 h of irradiation, indicating that wavelengths in this range are detrimental to the growth of buckwheat sprouts. © 2013 Elsevier Ltd. All rights reserved.

Nishimoto N.,Shimane Institute for Industrial Technology | Yamada Y.,The University of Shimane | Ohnishi Y.,The University of Shimane | Imawaka N.,Shimane Institute for Industrial Technology | Yoshino K.,Shimane Institute for Industrial Technology
Physica Status Solidi (A) Applications and Materials Science | Year: 2013

Thermal stabilities of indium tin oxide (ITO) substrates and TiO 2/ITO structures were evaluated in relation to their electrical properties. The ITO substrates and TiO2/ITO structures were annealed at 350, 400, and 500 °C. The ITO substrate with large grain size showed higher thermal stability than that with small grain size. The thermal stability of TiO2/ITO structure improved with increasing TiO2 thickness, and a decrease in electron concentration was observed in resistance-increased samples. These changes were attributed to variations in grain-boundary potential caused by oxygen adsorption. It may be concluded that variation of the grain-boundary potential by thermal annealing has a dominant influence on resistance. Therefore, optimization of the grain size is important to improve the thermal stability of ITO. This mechanism and procedure can be applied to improve the characteristics of other TCO materials. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Mori R.,The University of Shimane | Nakai T.,The University of Shimane | Enomoto K.,The University of Shimane | Uchio Y.,The University of Shimane | And 2 more authors.
Clinical Orthopaedics and Related Research | Year: 2011

Background: Major disadvantages of antibiotic bone cements include limited drug release and reduced strength resulting from the addition of high doses of antibiotics. Bacterial cellulose, a three-dimensional hydrophilic mesh, may retain antibiotics and release them gradually. We hypothesized that the addition of cellulose to antibiotic bone cement would improve mechanical strength and antibiotic release. Questions/purposes: We therefore examined the mechanical strength and antibiotic release of cellulose antibiotic cement. Methods: A high dose of antibiotics (5 g per 40 g cement powder) was incorporated into bacterial cellulose and then mixed with bone cement. We compared the compression strength, fracture toughness, fatigue life, and elution kinetics of this formulation with those of plain cement and a traditional antibiotic cement. Results: The average values for compression strength, fracture toughness, and fatigue life of the cellulose antibiotic cement were 97%, 97%, and 78% of the values obtained for plain cement, respectively. The corresponding values for the traditional antibiotic cement were 79%, 82%, and 17%, respectively. The cumulative elution over 35 days was 129% greater from the cellulose antibiotic cement than from the traditional antibiotic cement. Conclusions: With a high dose of antibiotics, incorporating cellulose into the bone cement prevented compression and fracture fragility, improved fatigue life, and increased antibiotic elution. Clinical Relevance: Antibiotic cements containing cellulose may have applications in clinical situations that require high levels of antibiotic release and preservation of the mechanical properties of the cement. © 2010 The Association of Bone and Joint Surgeons®.

Kadowaki M.,The University of Shimane | Yano A.,The University of Shimane | Ishizu F.,Shimane Agricultural Technology Center | Tanaka T.,Yamaguchi University | Noda S.,Shimane Institute for Industrial Technology
Biosystems Engineering | Year: 2012

The use of renewable energy for greenhouse environment control to replace or reduce the consumption of fuel and power-line electricity is an important objective for sustainable greenhouse crop production. This study was undertaken to apply a solar photovoltaic (PV) array to supply electricity for greenhouse environment control. The PV array was mounted inside the south roof of an east-west oriented single-span greenhouse, in which Welsh onion (Allium fistulosum L.) was cultivated hydroponically. Effects of PV-array shading on the Welsh onion growth were assessed. Two PV-array formations were tested: straight-line and checkerboard. For each arrangement, the PV array covered 12.9% of the greenhouse roof area. Beside the PV greenhouse, a control greenhouse was built with identical dimensions and orientation to those of the PV greenhouse. Welsh onion was cultivated also in the control greenhouse. The straight-line arranged PV-array (PV s array) cast shadows on a specific area of the cultivated plants continuously during the growth period. The fresh weight (FW) and dry-matter weight (DW) of Welsh onion cultivated under the PV s array shadow were significantly less than those of Welsh onion cultivated in the control greenhouse. The checkerboard PV-array (PV c array) cast shadows in the PV c greenhouse intermittently during growth. Consequently, the inhibitory effects of the PV-array shading on the FW and DW accumulations of Welsh onion were diminished. The electrical energy generated by the PV c array was comparable to that of the PV s array, which is another advantage of the PV c array. © 2012 IAgrE.

Feng Y.,Tianjin University | Qin M.,Tianjin University | Guo H.,Tianjin University | Yoshino K.,Shimane Institute for Industrial Technology | Feng W.,Tianjin University
ACS Applied Materials and Interfaces | Year: 2013

Optically actuated shape recovery materials receive much interest because of their great ability to control the creation of mechanical motion remotely and precisely. An infrared (IR) triggered actuator based on shape recovery was fabricated using polyurethane (TPU) incorporated by sulfonated reduced graphene oxide (SRGO)/sulfonated carbon nanotube (SCNT) hybrid nanofillers. Interconnected SRGO/SCNT hybrid nanofillers at a low weight loading of 1% dispersed in TPU showed good IR absorption and improved the crystallization of soft segments for a large shape deformation. The output force, energy density and recovery time of IR-triggered actuators were dependent on weight ratios of SRGO to SCNT (SRGO:SCNT). TPU nanocomposites filled by a hybrid nanofiller with SRGO:SCNT of 3:1 showed the maximum IR-actuated stress recovery of lifting a 107.6 g weight up 4.7 cm in 18 s. The stress recovery delivered a high energy density of 0.63 J/g and shape recovery force up to 1.2 MPa due to high thermal conductivity (1.473 W/mK) and Young's modulus of 23.4 MPa. Results indicate that a trade-off between the stiffness and efficient heat transfer controlled by synergistic effect between SRGO and SCNT is critical for high mechanical power output of IR-triggered actuators. IR-actuated shape recovery of SRGO/SCNT/TPU nanocomposites combining high energy density and output forces can be further developed for advanced optomechanical systems. © 2013 American Chemical Society.

Tanaka S.,The University of Shimane | Hanada T.,The University of Shimane | Ono K.,The University of Shimane | Watanabe K.,The University of Shimane | And 2 more authors.
Applied Physics Letters | Year: 2010

Improvement of power conversion efficiency of a zinc phthalocyanine (ZnPc) / C60 heterojunction solar cell was achieved by inserting a lithium phthalocyanine (LiPc) layer at the indium-tin oxide (ITO)/ZnPc interface. The results of photoelectron spectroscopy suggest that the barrier height for the hole transport at the ITO/ZnPc interface is reduced by the LiPc layer. A similar improvement of the power conversion efficiency by the insertion of a LiPc layer was also observed in M-phthalocyanine (M= H2, Cu, and TiO)/ C 60 cells. © 2010 American Institute of Physics.

Feng Y.,Tianjin University | Feng Y.,Tianjin Key Laboratory of Composite and Functional Materials | Zhang X.,Tianjin University | Zhang X.,Tianjin Key Laboratory of Composite and Functional Materials | And 5 more authors.
Carbohydrate Polymers | Year: 2012

A highly flexible nanocomposite film of bacterial cellulose (BC) and graphene oxide (GO) with a layered structure was presented using the vacuum-assisted self-assembly technique. Microscopic and X-ray diffraction measurements demonstrated that the GO nanosheets were uniformly dispersed in the BC matrix. The interactions between BC and GO were studied by Fourier transformation infrared spectroscopy. Compared with pristine BC, the integration of 5 wt% GO resulted in 10% and 20% increase in Young's modulus and tensile strength of the composite film. The electrical conductivity of the composite film containing 1 wt% GO after in situ reduction showed a remarkable increase by 6 orders of magnitude compared with the insulated BC. © 2011 Elsevier Ltd. All Rights Reserved.

Yoshino K.,Shimane Institute for Industrial Technology | Schmidt W.F.,Helmholtz Center Berlin
Proceedings of the 2014 IEEE 18th International Conference on Dielectric Liquids, ICDL 2014 | Year: 2014

Silicone oils are possible replacements for mineral oils in transformers. Many investigations on their electrical and thermo-physical properties have been carried out. Few reports on the measurements of the mobilities of positive and negative ions in these liquids exist in the literature. The present contribution summarizes data published and discusses the modes of charge transport in these liquids. © 2014 IEEE.

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