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Journal Articles

Fabrication of neutron optical devices using PBW technique

Sakai, Takuro; Iikura, Hiroshi; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Uchida, Masaya*

QST-M-8; QST Takasaki Annual Report 2016, P. 140, 2018/03

Journal Articles

Production of nano-sized platinum-particle films using low energy electron beams

Hakoda, Teruyuki; Yamamoto, Shunya; Aritani, Hirofumi*; Yoshikawa, Masahito

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 127, 2014/03

Reduction of noble metal ions and subsequent production of noble metal particles in a solution has been performed as a radiation-induced precipitation (RIP) method using high energy ionizing radiation. Electron beams with energies below 300 keV have shorter penetration range and can irradiate at higher dose rates. Application of such low energy EBs to the RIP method has a possibility of producing film matters consisting of noble metal particles on the surface of the solution. In the present study, this possibility was examined using a few ten keV EBs for PtCl$$_{6}$$$$^{2-}$$ ion solutions. Black-colored film matters were produced on the surface of the sample solution after EB irradiation. Lower concentrations of ethanol such as 0.5v% accelerated the formation of Pt films on the sample solution. The films had network structure consisting of connected Pt particles with sizes of 2-5 nm.

Journal Articles

Behavior of the energy of vibration failure experiment by using a 2-mass system model

Seki, Hajime*; Fujita, Satoshi*; Minagawa, Keisuke*; Kitamura, Seiji; Watakabe, Tomoyoshi

Dynamics and Design Conference 2013 (D&D 2013) Koen Rombunshu (USB Flash Drive), 8 Pages, 2013/08

When we study the behavior of the pipes during an earthquake, the most important damage doesn't come from the maximal load by itself, but from the accumulation of the fatigue damage caused by the repetition of the cyclic load. Therefore, from the point of view of seismic design evaluation methods, techniques that can quantitatively assess the probability of fatigue failure of mechanical structures are needed. The relationship between failure and energy is evaluated, and examined by focusing on the Energy Balance Method said to be effective as an earthquake response analysis technique in the present. This study carries out failure experiments using 2-mass system model based on Energy Balance Method. Furthermore, we focus on the strain from the vicinity of broken point as local response.

Journal Articles

Gasochromic property of dehydrogenation-catalyst loaded tungsten trioxide

Hakoda, Teruyuki; Igarashi, Hidetoshi*; Isozumi, Yukihiro*; Yamamoto, Shunya; Aritani, Hirofumi*; Yoshikawa, Masahito

Journal of Physics and Chemistry of Solids, 74(2), p.200 - 204, 2013/02

 Times Cited Count:3 Percentile:16.8(Chemistry, Multidisciplinary)

The gasochromic property of dehydrogenation-catalyst loaded tungsten trioxide (M/WO$$_{3}$$) powders was examined in exposure to gaseous cyclohexane under different kinds and contents of catalysts, catalyst temperatures, and cyclohexane concentrations. The change in the intensity of visible lights reflected from the M/WO$$_{3}$$ powders was in situ obtained using a portable visible-light spectrometer. The catalyst of Pt was a catalyst initiating dehydrogenation and the change of reflected light intensity at lower temperatures in comparison with the catalysts of Pd and Rh. Among 0.1, 0.5, and 1wt% Pt/WO$$_{3}$$ powders, the 0.5wt% Pt/WO$$_{3}$$ powders demonstrated large change of reflected lights. The heating of 0.5wt% Pt/WO$$_{3}$$ powders at temperatures higher than 130$$^{circ}$$C was required to visually detect cyclohexane at a concentration of 1v%, lower than the combustion lower limit (1.3v%).

Journal Articles

Preparation of nano-sized platinum particles using low energy electron beams, and application to catalytic reaction

Isozumi, Yukihiro; Hakoda, Teruyuki; Yamamoto, Shunya; Aritani, Hirofumi*; Yoshikawa, Masahito

Radioisotopes, 61(6), p.289 - 296, 2012/06

In the present study, the reduction of PtCl$$_{6}$$$$^{2-}$$ ions and subsequent formation of Pt particles were examined for a few tens keV EB irradiation of PtCl$$_{6}$$$$^{2-}$$ ion solution in the presence of 1-20wt% ethanol as an OH radical scavenger. As a result, the reduction of PtCl$$_{6}$$$$^{2-}$$ ions proceeded in whole solution by irradiating only the topmost surface layer of the solution, and these Pt particles with sizes of 2-5 nm would be produced as primary particles through reduction of PtCl$$_{6}$$$$^{2-}$$ ions. Moreover, these Pt particles were observed to have hydrogen dissociation activity and oxidation activity.

Oral presentation

Coloration property of dehydrogenation catalyst-loaded tungsten trioxide for cyclohexane

Igarashi, Hidetoshi; Hakoda, Teruyuki; Isozumi, Yukihiro; Tezuka, Meguru*; Yamamoto, Shunya; Yoshikawa, Masahito

no journal, , 

The coloration and dehydrogenation property of dehydrogen metal-catalyst loaded tungsten trioxide (M/WO$$_{3}$$) powders were examined for gaseous cyclohexane under different catalyst temperatures and cyclohexane concentrations to develop gasochromic materials to detect organic hydrides for hydrogen storage. The change in the color of the M/WO$$_{3}$$ powder in a glass reactor was in situ examined using a portable spectrometer with contacting with cyclohexane gases under different powder temperatures. For 5% cyclohexane, the coloration of 0.5wt% Pt/WO$$_{3}$$ was initiated at the lowest catalyst temperature of 100$$^{circ}$$C as compared with 140$$^{circ}$$C for 0.5wt% Pd/WO$$_{3}$$ and 150$$^{circ}$$C for 0.5wt% Rh/WO$$_{3}$$. The coloration of 0.5wt% Pt/WO$$_{3}$$ was also initiated for cyclohexane at concentration of 1%, lower than the combustion lower limit (1.3%), by heating at a temperature of 170$$^{circ}$$C.

Oral presentation

Production of platinum nanoparticles using a few ten keV electron beams and application to catalytic reactions

Hakoda, Teruyuki; Isozumi, Yukihiro*; Yamamoto, Shunya; Aritani, Hirofumi*; Yoshikawa, Masahito

no journal, , 

In the present study, the reduction of PtCl$$_{4}$$$$^{2-}$$ ions and subsequent formation of Pt particles were examined for a few tens keV EB irradiation of PtCl$$_{4}$$$$^{2-}$$ ion solution in the presence of 5-20wt% ethanol as an OH radical scavenger. As a result, the reduction of PtCl$$_{4}$$$$^{2-}$$ ions proceeded in whole solution by irradiating only the topmost surface layer of the solution, and these Pt particles with sizes of 2-5 nm would be produced as a primary particle through reduction of PtCl$$_{4}$$$$^{2-}$$ ions. Moreover, these Pt particles was observed to have hydrogen dissociation activity and oxidation activity.

Oral presentation

Study on seismic assessment of mechanical members and piping based on seismic energy

Seki, Hajime*; Fujita, Satoshi*; Omi, Toshio*; Minagawa, Keisuke*; Kitamura, Seiji; Watakabe, Tomoyoshi

no journal, , 

no abstracts in English

Oral presentation

Study on seismic assessment of mechanical members based on energy balance method

Seki, Hajime*; Fujita, Satoshi*; Omi, Toshio*; Minagawa, Keisuke*; Kitamura, Seiji; Watakabe, Tomoyoshi

no journal, , 

no abstracts in English

Oral presentation

Preparation of platinum nano-sized planar networks using low energy electron beams

Hakoda, Teruyuki; Yamamoto, Shunya; Shimoyama, Iwao; Aritani, Hirofumi*; Yoshikawa, Masahito

no journal, , 

Water solution containing 1 mmol/L PtCl$$_{4}$$$$^{2-}$$ ions and 0.5-20v% ethanol was irradiated with low energy electron beams. Production of planar networks was observed on the surface of the irradiated solution. Rutherford backscattering spectrometry and X-ray photoelectron spectroscopy demonstrated that the planar networks consisted of metal platinum and their production was accelerated at lower ethanol concentrations. Transmission electron microscope observation suggested that Pt particles with sizes of 2-5 nm are produced through reduction of PtCl$$_{4}$$$$^{2-}$$ ions at the surface of the solution. These Pt particles coagulated each other to form planar network.

Oral presentation

Production of platinum nanoparticles using a few ten keV electron beams and application to catalytic reactions

Hakoda, Teruyuki; Yamamoto, Shunya; Yoshikawa, Masahito; Isozumi, Yukihiro*; Aritani, Hirofumi*

no journal, , 

In the present study, the reduction of PtCl$$_{4}$$$$^{2-}$$ ions and subsequent formation of Pt particles were examined for a few tens keV EB irradiation of PtCl$$_{4}$$$$^{2-}$$ ion solution in the presence of 1-20wt% ethanol as an OH radical scavenger. As a result, the reduction of PtCl$$_{4}$$$$^{2-}$$ ions proceeded in whole solution by irradiating only the topmost surface layer of the solution, and these Pt particles with sizes of 2-5 nm would be produced as primary particles through reduction of PtCl$$_{4}$$$$^{2-}$$ ions. Moreover, these Pt particles were observed to have hydrogen dissociation activity and oxidation activity.

Oral presentation

Catalytic property of platinum nanoparticle films using a few tens keV electron beam induced reduction method

Hakoda, Teruyuki; Yamamoto, Shunya; Shimoyama, Iwao; Aritani, Hirofumi*; Yoshikawa, Masahito

no journal, , 

We previously observed that platinum nanoparticles films was produced on the surface of a solution containing 1 mmol/L PtCl$$_{4}$$$$^{2-}$$ ions and 0.5-20v% ethanol by irradiating with a few tens keV electron beams (EB). In the present study, the platinum films were deposited to tungsten trioxide (WO$$_{3}$$) films, which show hydrogen gasochromic property, to examine the catalytic property of the platinum films. The transmittance of 700-nm lights through the prepared (Pt/WO$$_{3}$$) films decreased in exposing to 1v% hydrogen/nitrogen gas. This decrease suggests the production of HxWO$$_{3}$$ films through the reaction of WO$$_{3}$$ films with hydrogen atoms dissociated over Pt nanoparticles. The Pt nanoparticle films prepared using a few tens keV EB induced reduction method were observed to have catalytic activity.

Oral presentation

Production of nano-sized platinum-particle films using low energy electron beams

Hakoda, Teruyuki; Yamamoto, Shunya; Shimoyama, Iwao; Yoshikawa, Masahito; Aritani, Hirofumi*

no journal, , 

Water solution containing 1 mmol/L PtCl$$_{4}$$$$^{2-}$$ ions and 0.5-20v% ethanol was irradiated with low energy electron beams. Production of thin films were observed on the surface of the irradiated solution. Rutherford backscattering spectrometry and X-ray photoelectron spectroscopy demonstrated that the thin films consisted of metal platinum and their production was accelerated at lower ethanol concentrations. Transmission electron microscope observation suggested that Pt particles with sizes of 2-5 nm are produced through reduction of PtCl$$_{4}$$$$^{2-}$$ ions at the surface of the solution. These Pt particles coagulated each other to form the films.

Oral presentation

Production of platinum particles on the surface of porous substrates using a few tens keV electron beam induced reduction method

Hakoda, Teruyuki; Yamamoto, Shunya; Aritani, Hirofumi*; Yoshikawa, Masahito

no journal, , 

The production of noble metal catalyst particles on the surface of catalyst substrates were studied using low energy electron beams (EBs) as a radiation-induced reduction method. Porous alumina substrates were impregnated in a solution containing PtCl$$_{4}$$$$^{2-}$$ ions and ethanol. The surface of the substrates was irradiated with EBs. As a result, platinum particles were produced on the surface of the substrates. The platinum particles had catalytic activity. The obtained results suggest that low energy EBs can be applied to the production of noble metal catalysts as new application of a radiation-induced reduction method.

Oral presentation

Fabrication of novel neutron optical devices using proton microbeam

Sakai, Takuro; Iikura, Hiroshi; Matsubayashi, Masahito; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Uchida, Masaya*

no journal, , 

no abstracts in English

Oral presentation

Fabrication of neutron fine gratings using in-air proton microbeam

Sakai, Takuro; Iikura, Hiroshi; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Uchida, Masaya*

no journal, , 

no abstracts in English

Oral presentation

Fabrication of novel neutron optical devices using proton microbeam, 2

Sakai, Takuro; Iikura, Hiroshi; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Uchida, Masaya*

no journal, , 

no abstracts in English

Oral presentation

Fabrication of novel neutron optical devices using proton microbeam, 3

Sakai, Takuro; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Yamamoto, Shunya*; Uchida, Masaya*

no journal, , 

no abstracts in English

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