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Suzuki, Seiya; Nemoto, Yoshihiro*; Shiiki, Natsumi*; Nakayama, Yoshiko*; Takeguchi, Masaki*
Annalen der Physik, 535(9), p.2300122_1 - 2300122_12, 2023/09
Times Cited Count:0 Percentile:0.00(Physics, Multidisciplinary)Hagiwara, Hiroki; Kondo, Keietsu; Hidaka, Akihide
Journal of Radioanalytical and Nuclear Chemistry, 331(12), p.5905 - 5914, 2022/12
Times Cited Count:3 Percentile:63.91(Chemistry, Analytical)Dohi, Terumi; Iijima, Kazuki; Machida, Masahiko; Suno, Hiroya*; Omura, Yoshihito*; Fujiwara, Kenso; Kimura, Shigeru*; Kanno, Futoshi*
PLOS ONE (Internet), 17(7), p.e0271035_1 - e0271035_21, 2022/07
Times Cited Count:1 Percentile:12.42(Multidisciplinary Sciences)Hagiwara, Hiroki; Funaki, Hironori; Shiribiki, Natsu*; Kanno, Marina*; Sanada, Yukihisa
Journal of Radioanalytical and Nuclear Chemistry, 331(1), p.415 - 426, 2022/01
Times Cited Count:7 Percentile:75.12(Chemistry, Analytical)Oka, Hiroshi; Tanno, Takashi; Yano, Yasuhide; Otsuka, Satoshi; Kaito, Takeji; Tachi, Yoshiaki
Journal of Nuclear Materials, 547, p.152833_1 - 152833_7, 2021/04
Times Cited Count:7 Percentile:75.12(Materials Science, Multidisciplinary)In order to evaluate the stability of nano-sized oxide particles and matrix structure of ODS cladding tube, which are the determinants of their high temperature strength, the microstructural observation was carried out after internal pressurized creep test at 700C for over 45,000 hours. The specimens were the as-received and crept specimens of 9Cr-ODS steel with tempered martensite and 12Cr-ODS steel with recrystallized ferrite. Small platelet was cut out from the crept pressurized tube, then thinned to foil. Microstructural observation was conducted with TEM JEOL 2010F. As a result of the observation, it was confirmed that the size and number density of the nano-sized particles were almost unchanged even after the creep test. In addition, the tempered martensite structure, which is one of the determinants of the creep strength of 9Cr-ODS steel, was not significantly different between the as-received and crept specimen, indicating the stability of their matrix structure.
Okumura, Taiga*; Yamaguchi, Noriko*; Dohi, Terumi; Iijima, Kazuki; Kogure, Toshihiro*
Microscopy, 68(3), p.234 - 242, 2019/06
Times Cited Count:11 Percentile:71.03(Microscopy)Radiocesium-bearing microparticles (CsMPs), consisting substantially of silicate glass, were released to the environment during the Fukushima nuclear accident in March 2011. We investigated a total of nine CsMPs using transmission electron microscopy (TEM) and inferred the atmosphere in the reactors during the accident. From elemental mapping using energy-dispersive X-ray spectrometry, Fe and Zn showing radial inhomogeneities were found in the CsMPs, in addition to the Cs that had been previously reported. Four of the CsMPs included submicron crystals, which were identified as chromite, franklinite, acanthite, molybdenite, and hessite. The chromium-containing spinels, chromite and franklinite, indicated the presence of ferrous iron (Fe), suggesting that the inside of the reactors was reductive to some extent. Electron energy-loss spectroscopy also confirmed that the CsMPs did not contain boron, and therefore the atmosphere in which they were formed might be boron-free.
Okuchi, Takuo*; Tomioka, Naotaka*; Purevjav, N.*; Shibata, Kaoru
Journal of Applied Crystallography, 51, p.1564 - 1570, 2018/12
Times Cited Count:2 Percentile:20.54(Chemistry, Multidisciplinary)It is demonstrated that quasielastic neutron scattering (QENS) is a novel and effective method to analyse atomic scale hydrogen transport processes occurring within a mineral crystal lattice. The method was previously characterized as sensitive for analysing the transport frequency and distance of highly diffusive hydrogen atoms or water molecules in condensed matter. Here are shown the results of its application to analyse the transport of much slower hydrogen atoms which are bonded into a crystal lattice as hydroxyls. Two types of hydrogen transport process were observed in brucite, Mg(OH) : a jump within a single two-dimensional layer of the hydrogen lattice and a jump into the next nearest layer of it. These transport processes observed within the prototypical structure of brucite have direct implications for hydrogen transport phenomena occurring within various types of oxides and minerals having layered structures.
Oka, Hiroshi; Tanno, Takashi; Otsuka, Satoshi; Yano, Yasuhide; Kaito, Takeji
Nuclear Materials and Energy (Internet), 16, p.230 - 237, 2018/08
Times Cited Count:4 Percentile:37.66(Nuclear Science & Technology)Oka, Hiroshi; Tanno, Takashi; Otsuka, Satoshi; Yano, Yasuhide; Uwaba, Tomoyuki; Kaito, Takeji; Onuma, Masato*
Nuclear Materials and Energy (Internet), 9, p.346 - 352, 2016/12
Times Cited Count:21 Percentile:88.40(Nuclear Science & Technology)Maekawa, Yasunari; Suzuki, Yasuyuki; Maeyama, Katsuya*; Yonezawa, Noriyuki*; Yoshida, Masaru
Chemistry Letters, 33(2), p.150 - 151, 2004/02
Times Cited Count:4 Percentile:21.68(Chemistry, Multidisciplinary)Since well-characterized chemical modification of pore inner surfaces in polymer membranes should be very important from the view point of synthetic chemistry of polymer surfaces as well as designing materials for application such as separation membranes and nanoscopic electronic devices, we reported herein the chemical modification of internal surfaces of the cylindrical pores with 0.31 and 0.54 m in diameter through the reaction of the carboxylic acids on the surfaces with the alkylation reagent bearing a pyrene fluorophore. The incorporation of the fluorophore on the pore internal surfaces were successfully confirmed by the fluorescence microscope images of the membrane reacting with the alkylation reagent bearing a pyrene fluorophore.
Imanaka, Soichi*; Okada, Michio*; Kasai, Toshio*; Teraoka, Yuden; Yoshigoe, Akitaka
JAERI-Tech 2003-066, 36 Pages, 2003/08
The reactions of organic molecules with a Si(001) surface play important roles in many applied fields such as LSI, molecular device, sensor, non-liner optical materials, catalysis, coating, preservation from decay, and so on. Especially, the dissociative adsorption of CHCl is an important initial process in the production of diamond and silicon carbide thin films. However, it is required to control the orientation of CH
Cl for the elucidation of the detailed mechanism of the dissociative adsorption. In the present experiments, we studied the dissociative adsorption of CH
Cl on a clean Si(001) surface under ultra-high vacuum using Scanning Tunneling Microscopy (STM). We found, for the first time, that there are two reaction passes of CH
Cl(g) to CH
(a)+Cl(a) and CH
Cl(g) to CH
(a)+Cl(g) in the dissociative adsorption of CH
Cl on the Si
surface.
Hata, Yoshiaki; Suzuki, Junichi; Kakeya, Itsuhiro*; Kadowaki, Kazuo*; Nakayama, Satoshi*; Nagata, Atsushi*; Odawara, Akikazu*; Chinone, Kazuo*
Physica C, 378-381(Part1), p.420 - 423, 2002/10
no abstracts in English
Igarashi, Shinichi; Muto, Shunsuke*; Tanabe, Tetsuo*; Aihara, Jun; Hojo, Kiichi
Surface & Coatings Technology, 158-159, p.421 - 425, 2002/09
no abstracts in English
Abe, Hiroaki
Hoshasen To Sangyo, (88), p.54 - 60, 2000/12
no abstracts in English
Abe, Hiroaki; Yamamoto, Shunya; Miyashita, Atsumi
Dai-11-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu (BEAMS 2000) Hobunshu, p.127 - 130, 2000/11
no abstracts in English
Goto, Masahiro*; Kawanishi, Shunichi; Fukumura, H.*
Applied Surface Science, 154-155, p.701 - 705, 2000/02
Times Cited Count:15 Percentile:61.43(Chemistry, Physical)no abstracts in English
Lippert, T.*; Gerber, T.*; Wokaun, A.*; Funk, D. J.*; Fukumura, H.; Goto, Masahiro
Applied Physics Letters, 75(7), p.1018 - 1020, 1999/00
Times Cited Count:39 Percentile:81.30(Physics, Applied)no abstracts in English
Goto, Masahiro*; Ichinose, Yuji; Kawanishi, Shunichi; Fukumura, H.*
Applied Surface Science, 138-139, p.471 - 476, 1999/00
Times Cited Count:10 Percentile:51.85(Chemistry, Physical)no abstracts in English
; Isoda, S.*; Kurata, Hiroki; ; ; Kobayashi, Takashi*
Polymer, 39(3), p.591 - 597, 1998/00
Times Cited Count:5 Percentile:26.74(Polymer Science)no abstracts in English
Abe, Hiroaki; Kinoshita, Chiken*;
Mater. Res. Soc. Symp. Proc. Vol. 373, 0, p.487 - 492, 1995/00
no abstracts in English