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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：72.21(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 700
C 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.
decomposition on Si(110)Yano, Masahiro; Uozumi, Yuki*; Yasuda, Satoshi; Asaoka, Hidehito; Tsukada, Chie*; Yoshida, Hikaru*; Yoshigoe, Akitaka
e-Journal of Surface Science and Nanotechnology (Internet), 16, p.370 - 374, 2018/08
Yano, Masahiro; Uozumi, Yuki*; Yasuda, Satoshi; Asaoka, Hidehito
Japanese Journal of Applied Physics, 57(6S1), p.06HD04_1 - 06HD04_4, 2018/06
Times Cited Count：4 Percentile：20.17(Physics, Applied)Yamaki, Tetsuya; Asai, Keisuke*
Langmuir, 17(9), p.2564 - 2567, 2001/05
Times Cited Count：41 Percentile：92.2(Chemistry, Multidisciplinary)A new type of TiO nanosheet-organic complex multilayer film was successfully prepared by the Langmuir-Blodgett technique. Surface pressure-area curves demonstrated that a stable monolayer of dioctadecyldimethylammonium bromide (DODAB) was formed on an aqueous suspension of TiO nanosheets derived from an exfoliated layered titanate, H
Ti
□
O
・HO (x
0.7; □, vacancy). The hybrid monolayer of the ammonium amphiphiles and the TiO nanosheet was quantitatively transferred onto a hydrophobic quartz plate to form a multilayer film. X-ray diffraction measurements confirmed the formation of an ordered structure of DODAB/TiO with an interlayer distance of 3.4 nm.
2 through wet etchingYano, Masahiro; Suzuki, Shota; Uozumi, Yuki; Asaoka, Hidehito
no journal, ,
Yano, Masahiro; Uozumi, Yuki*; Yasuda, Satoshi; Asaoka, Hidehito
no journal, ,
2Yano, Masahiro; Terasawa, Tomoo; Yasuda, Satoshi; Machida, Shinichi*; Asaoka, Hidehito
no journal, ,
The anisotropic diffusion coefficient ratio of the Si atoms on the Si(110)-162 reconstructed structure is determined by observing the "void" by scanning tunneling microscope (STM). The void length was measured to evaluate the anisotropic growth rate ratios for each void depth. The anisotropy of the void shape decreased as the void became deeper, indicating the reduction of the Si density ratio during the diffusion on the sidewall. Taking the migration of diffusing Si atoms to the upper and lower terraces and the adjacent sidewalls into account, we determined that the diffusion coefficient in the direction along the [1
2] or [12] parallel to the step rows of the 162 reconstructed structure is 3.0 times higher than that of the other direction.
Yano, Masahiro; Asaoka, Hidehito
no journal, ,
Graphene nanoribbons that were bottom-up synthesized from self-assembled precursor monolayers on Au(100) and Au(111) were observed by using a scanning tunneling microscope (STM). It was revealed that the molecular orientation of the self-assembled monolayers decides the orientation direction of the graphene nanoribbons. In particular, the orientation direction of the graphene nanoribbons coincides with the one-dimensional uneven of the surface reconstruction structure on Au(100). It means that the controllability of graphene nanoribbon orientation on Au(100) is higher than that of Au(111). This is an important finding for the device application of graphene nanoribbons.
Yano, Masahiro; Yasuda, Satoshi; Asaoka, Hidehito
no journal, ,
