Shonan Plastic Manufacturing Co.

Hiratsuka, Japan

Shonan Plastic Manufacturing Co.

Hiratsuka, Japan
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Yonemura T.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Shima H.,Yamanashi University | Nakamura Y.,Toyohashi University of Technology | And 5 more authors.
Carbon | Year: 2015

Tensile tests were performed on nine carbon nanocoils (CNCs) using a focused-ion-beam (FIB) technique. In each experiment, an individual CNC was picked up using an FIB, and a CNC bridge formed between a tungsten probe and the spring-table substrate. Real-time observations of the CNC elongation and subsequent fracture under prolonged stretching enabled us to estimate the elastic limit, the spring constant, the shear modulus, and the ultimate strength of each CNC and their mean values. The mechanics of CNCs was also compared to that of macroscopic springs. © 2014 Elsevier Ltd. All rights reserved.


Okabe Y.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Tanoue H.,Toyohashi University of Technology | Takikawa H.,Toyohashi University of Technology | And 2 more authors.
Electrochimica Acta | Year: 2014

Carbon nanomaterials are used as an electrode of electric double layer capacitors (EDLCs). In this research, we used arc black (AcB) and carbon nanoballoon (CNB) as the electrode material. AcB was produced by an arc discharge of graphite in N2 atmosphere, and CNB was formed by a heat treatment of AcB. CNB is graphitic, and the particle shape is hollow. CNB has a higher specific capacitance than AcB at a high scan rate. In order to increase the specific capacitance of EDLC, CNB was oxidized at 625 °C in the air. By oxidization, the outer shell of CNB forms wrinkle. We call this material oxidized CNB (Ox-CNB). AcB, CNB, and Ox-CNB were used for the EDLC electrodes and were compared with commercially available activated carbon (AC). Cyclic voltammetry and electrochemical impedance spectroscopy of the EDLC electrodes were measured by an electrochemical measurement system. The specific capacitance of Ox-CNB (29 F/g) was larger than that of AC (16 F/g) at a scan rate of 500 mV/s. Furthermore, Ox-CNB had a high conductivity as a result of impedance measurement. Ox-CNB is an excellent electrode material of EDLC when using at a high charge/discharge rate. © 2014 Elsevier Ltd.


Shimizu Y.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Takikawa H.,Toyohashi University of Technology | Ue H.,Tokai Carbon Co. | And 2 more authors.
Electrochemistry | Year: 2015

The application of a microporous layer (MPL) between the gas diffusion layer and the catalyst layer (CL) plays a crucial role in the performance of the direct methanol fuel cell (DMFC). To this end, this study investigates the effects of carbon loading and the nature of the carbon material used in the anode MPL on the performance of DMFC using transmission and scanning electron microscopy, polarization technique, and electrochemical impedance spectroscopy (EIS). DMFC was indigenously fabricated using 30wt% PtRu catalyst supported on carbon nanocoil and commercial Pt catalyst as the anode CL and the cathode CL, respectively. Carbon nanoballoon (CNB) and Vulcan XC-72R (Vulcan) were used as the anode MPL. According to polarization studies, a membrane electrode assembly (MEA) with CNB and Vulcan MPLs (loading of 1.5mgcm-2) shows higher power density. This is 1.3 and 1.8 times higher than that without the anode MPL when methanol concentration was 0.5M (M = moldm-3), respectively. Electrochemical impedance spectra (EIS) results indicate that the MEAs with the anode MPLs have lower highfrequency resistance and charge transfer resistance when compared to those without the anode MPL. Thus, it can be realized that the anode MPL plays a significant role in the effective utilization of CNC-supported PtRu anode catalyst, thereby improving DMFC performance. © The Electrochemical Society of Japan, All rights reserved.


Suda Y.,Toyohashi University of Technology | Shimizu Y.,Toyohashi University of Technology | Ozaki M.,Toyohashi University of Technology | Tanoue H.,Toyohashi University of Technology | And 4 more authors.
Materials Today Communications | Year: 2015

PtRu or Pt catalysts were supported on four types of carbon nanomaterials with different shapes, sizes, and graphitic and electrical properties, and their resulting catalytic activities were evaluated by electrochemical methods. The carbon nanomaterials used included two types of particles: Arc Black (AcB) and Vulcan XC-72R (Vulcan), and two types of nanofibers: carbon nanocoils (CNC) and VGCF-X. Pt and Ru were loaded onto the nanomaterials by a reduction method using sodium borohydride. Transmission electron microscopy and X-ray diffraction (XRD) revealed the PtRu catalyst particles to be 4-6. nm in diameters. The shifts in the Pt(1. 1. 1) XRD peak of the catalysts on CNC and VGCF-X were larger than those on AcB and Vulcan, indicating a higher degree of alloying between Pt and Ru. The diameters of the CNC-supported Pt and PtRu catalyst particles had the narrowest distributions and were constant within the range of catalyst loadings investigated. Electrochemical studies of the catalysts during methanol oxidation were carried out using cyclic voltammetry. The catalyst particles supported on CNC and VGCF-X exhibited higher catalytic activity than those on AcB and Vulcan. The effect of the surface area of the carbon nanomaterials on the catalytic activity is discussed. © 2015 Elsevier Ltd.


Sugioka Y.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Tanoue H.,Toyohashi University of Technology | Takikawa H.,Toyohashi University of Technology | And 3 more authors.
IEEE Transactions on Plasma Science | Year: 2012

Dielectric barrier discharge (DBD) treatment is one of the methods used to make carbon nanofibers stand up on substrates. Upright carbon nanofibers are used as field emission materials. We have used twisted carbon nanofibers (CNTws) as field emission materials and treated printed CNTws on substrates using DBD. In this report, we examine the effects of DBD conditions on the uprightness of the CNTws. The DBD experimental parameters were as follows: 1) N 2/He gas mixture ratio, 2) pulse frequency, and 3) Pt coating on the CNTw surface. The lengths of upright CNTws from the substrate surface and from the surface of a printed CNTw dot were measured using scanning electron microscopy. N 2 gas was shown to be crucial for generating streamer discharges and making the CNTw stand up on the substrate. As the pulse frequency increased, the lengths of the upright CNTws and their number density increased. This is explained by an increase in the number of streamers; the streamers move about over the substrate surface. Pt coating lowered the onset voltage for field emission from the CNTws although the number of upright CNTws was less than that without the Pt coating. © 2012 IEEE.


Yonemura T.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Tanoue H.,Toyohashi University of Technology | Takikawa H.,Toyohashi University of Technology | And 3 more authors.
Journal of Applied Physics | Year: 2012

We fix a carbon nanocoil (CNC) on a substrate in a focused ion beam instrument and then fracture the CNC with a tensile load. Using the CNC spring index, we estimate the maximum to average stress ratio on the fractured surface to range from 1.3 to 1.7, indicating stress concentration on the coil wire inner edge. Scanning electron microscopy confirms a hollow region on the inner edge of all fractured surfaces. © 2012 American Institute of Physics.


Okabe Y.,Toyohashi University of Technology | Izumi H.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Tanoue H.,Toyohashi University of Technology | And 3 more authors.
Japanese Journal of Applied Physics | Year: 2013

Carbon nanomaterials with different structures were mixed for an electric double layer capacitor (EDLC) electrode. We used two kinds of carbon nanomaterial: arc black (AcB) and a carbon nanoballoon (CNB). Arc black was synthesized by arc discharge. CNB was produced by heating the prepared AcB at 2400 °C. AcB mostly consists of an amorphous component and has a large specific surface area. On the other hand, CNB has a graphitic surface and a high conductivity. To utilize their characteristics, AcB and CNB were used as the main materials of the EDLC electrode in weight ratios of 1: 1, 2: 1, and 1: 2. The obtained EDLC electrode was filled with 1M H2SO4 as the electrolyte. As a result, by mixing AcB and CNB, both the power and energy densities became higher than those of AcB or CNB alone. The EDLC mixed in 1: 1 weight ratio of AcB and CNB showed the highest performance, with a higher electric power density than activated carbon (AC). © 2013 The Japan Society of Applied Physics.


Sato T.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Uruno H.,Toyohashi University of Technology | Takikawa H.,Toyohashi University of Technology | And 5 more authors.
Journal of Physics: Conference Series | Year: 2012

In this study, we used two types of carbon nanomaterials, arc-black (AcB) which has an amorphous structure and carbon nano-balloon (CNB) which has a graphitic structure as electrochemical capacitor electrodes. We made a coin electrode from these carbon materials and fabricated an electric double-layer capacitor (EDLC) that sandwiches a separator between the coin electrodes. On the other hand, RuO 2 was loaded on these carbon materials, and we fabricated a pseudo-capacitor that has an ion insertion mechanism into RuO 2. For comparison with these carbon materials, activated carbon (AC) was also used for a capacitor electrode. The electrochemical properties of all the capacitors were evaluated in 1M H 2SO 4 aqueous solution. As a result of EDLC performance, AcB electrode had a higher specific capacitance than AC electrode at a high scan rate (≥ 100 mV/s). In the evaluation of pseudo-capacitor performance, RuO 2-loaded CNB electrode showed a high specific capacitance of 734 F/g per RuO 2 weight. © Published under licence by IOP Publishing Ltd.


Suda Y.,Toyohashi University of Technology | Ozaki M.,Toyohashi University of Technology | Tanoue H.,Toyohashi University of Technology | Takikawa H.,Toyohashi University of Technology | And 3 more authors.
Journal of Physics: Conference Series | Year: 2013

PtRu catalysts were supported on five types of carbon nanomaterials of various shapes, sizes, and graphitic properties and the catalyst supports evaluated. The carbon nanomaterial used included three types of nanoparticles: Arc Black (AcB), Vulcan XC-72 (Vulcan) and graphene oxide (GO), and two types of nanofibers: carbon nanocoil (CNC) and carbon nanotube (CNT). Pt and Ru were supported by the reduction method using sodium borohydride. The metal catalyst loading was confirmed by thermo-gravimetric analysis (TGA), electron microscopy, and X-ray diffraction (XRD). Transmission electron microscopy (TEM) and XRD revealed that the diameter of PtRu catalyst nanoparticles loaded on reduced GO (rGO) and AcB were ∼2 nm and was the smallest among all the samples. Shifts in Pt (111) XRD peaks of CNC and CNT were larger than those of AcB, Vulcan, and rGO. These results suggest that the diameters of catalyst nanoparticles became smaller by loading on the carbon nanoparticles with a large surface area including rGO, AcB, and Vulcan. Loading onto the carbon nanofibers enhanced the degree of PtRu alloying.


Yokota M.,Toyohashi University of Technology | Suda Y.,Toyohashi University of Technology | Takikawa H.,Toyohashi University of Technology | Ue H.,Tokai Carbon Co. | And 2 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2011

Thin carbon nanocoil (CNC) with a fiber diameter of less than 50 nm was synthesized by catalytic chemical vapor deposition using Fe-Sn catalyst supprorted on zeolite. The chemical vapor deposition parameters of reaction temperature, gas flow rate of N 2 as dilute gas and C 2H 2 as source gas were 650-750 °C, 1000 ml/min and 50-300 ml/min respectively. Transmission electron microscopic observation revealed that thin CNCs had a hollow and multi-walled structure with cylindrical graphitic layers. More than 90% of the CNCs obtained were multi-walled CNCs (MWCNCs), and the remainder was columnar CNCs without a hollow structure. Three-dimensional images of an MWCNC with Au nanoparticles on its surface were reconstructed by electron tomography and confirmed that the MWCNC had a three-dimensional helical shape. © 2011 American Scientific Publishers.

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