Satoshi Utsunomiya

Kyushu University

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i-10 index

Research Trends

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Co-Authors

Rodney C. Ewing

Stanford University

100

Toshihiko Ohnuki

Japan Atomic Energy Agency

Shinya Yamasaki

University of Tsukuba

Bernd Grambow

IMT Atlantique

Gareth T. W. Law

University of Helsinki

Artur P. Deditius

Murdoch University

Asumi Ochiai

Kyushu University

Hidetaka Takato

National Institute of Advanced Industrial Science and Technology

Katsuhiko Shirasawa

National Institute of Advanced Industrial Science and Technology

Yasuhiro Kida

National Institute of Advanced Industrial Science and Technology

Cooperative Institutions

Centre National de la Recherche Scientifique

159

The University of Tokyo

134

Japan Aerospace Exploration Agency

109

High Energy Accelerator Research Organization

100

University of California, Berkeley

Kyushu University

Cardiff University

Tohoku University

Kavli Institute for the Physics and Mathematics of the Universe

Lawrence Berkeley National Laboratory

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Primary haematite formation in an oxygenated sea 3.46 billion years ago

Nature Geoscience (2009)

M. Hoashi D. C. Bevacqua Tsubasa Otake Yumiko Watanabe Arthur H. Hickman

Billion years

Early Earth

10.1038/ngeo465

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Citations (117)

Nano-scaled Calcium Molybdate Particle Formation on Egg Phosphatidylcholine Liposome Surface

Chemistry Letters (2019)

Shinya Yamasaki Saori Kurita Asumi Ochiai Keisuke Sueki Satoshi Utsunomiya

Calcium molybdate nanoparticles were synthesized using a liposome based on egg phosphatidylcholine and cholesterol. The molybdate ion was encapsulated into the liposome, and then a calcium chloride solution was added to the liposome suspension. The molybdenum release kinetics from the liposome to the bulk solution was determined to be 8 ppb h−1. The calcium ion caused aggregation of the liposomes at a higher concentration (>2.5 mM). By using a 1 mM calcium solution, the nanosized calcium molybdate (∼20 nm) precipitated on the liposome surfaces. Calcium molybdate nanoparticles were synthesized using a liposome. The molybdate ion was encapsulated into the liposome, and then a calcium chloride solution was added to the liposome suspension. By using a lower calcium concentration solution (1 mM), the nanosized calcium molybdate (∼20 nm) precipitated successfully on the liposome surfaces.

Sodium molybdate

10.1246/cl.190651

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Citations (2)

Mechanism of Metallization-Induced Losses in the Rear-Side of Fully Screen-Printed p-type PERC Solar Cells

IEEE Journal of Photovoltaics (2020)

Supawan Joonwichien Masaaki Moriya Satoshi Utsunomiya Yasuhiro Kida Katsuhiko Shirasawa

This article investigates metallization-induced recombination losses associated with the presence of silicon (Si) in the 1) rear passivation layers and 2) aluminum (Al) paste in fully screen-printed p-type passivated emitter and rear cell (PERC) solar cells. For 1), the rear sides of PERCs passivated with aluminum oxide films stacked with silicon nitride (SiN _y ) films with various refractive indexes (n), as defined by the composition of the SiN _y films, were fabricated. Si-rich SiN _y films strongly degraded the implied open-circuit voltages of symmetrically passivated samples, that include cells. Elemental mapping analysis confirmed further metallization-induced losses at the cell level because of the formation of an Al-Si alloy within the passivation stacks, with the density of the alloy dependent on the refractive index. For 2), the rear sides of PERCs were metallized with Si-free Al paste or Al pastes that contain Si. High-Si paste had both good and bad effects: it produced thicker aluminum back surface fields but left partially-formed Al-Si alloy within the passivation films.

Passivation

10.1109/jphotov.2019.2962337

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Citations (8)

ChemInform Abstract: Novel Lithium Iron Pyrophosphate (LiFe_1.5P₂O₇) as a Positive Electrode for Li‐Ion Batteries.

ChemInform (2007)

C.V. Ramana Atmane Ait-Salah Satoshi Utsunomiya A. Mauger F. Gendron

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.200801015

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Citations (0)

Influence of Moisture Content on Defect Detection by Active Thermography Method to Concrete Structure

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography (2020)

H. Kondou M. Koyama Masashi Ishikawa Hiroshi Sasano Hiroshi Hatta

At present, damage due to deterioration of concrete structures is a social problem.In order to prevent this problem, an infrared thermography method has been proposed and verified as a non-destructive inspection method different from conventional methods.Therefore, the infrared thermographic non-destructive testing considering with environmental condition and the weather condition which can happen to existing structure were considered in the present study.In this study, the effect of moisture content in concrete on defect detection was focused.As a result, it was suggested that the moisture content affects the defect detection.

Thermography

10.21611/qirt.2020.092

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The role of nanoscale aggregation of ferrihydrite and amorphous silica in the natural attenuation of contaminant metals at mill tailings sites

Geochimica et Cosmochimica Acta (2021)

Keisuke Kawamoto Hiroki Yokoo Asumi Ochiai Yuriko Nakano Ayaka Takeda

Ferrihydrite

Acid Mine Drainage

10.1016/j.gca.2021.02.004

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Citations (12)

Occurrence of radioactive cesium-rich micro-particles (CsMPs) in a school building located 2.8 km south-west of the Fukushima Daiichi Nuclear Power Plant

Chemosphere (2023)

Kazuki Fueda Tatsuki Komiya Kenta Minomo Kenji Horie Mami Takehara

Caesium

10.1016/j.chemosphere.2023.138566

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Citations (14)

Stability of uranium (VI) peroxide hydrates under ionizing radiation

American Mineralogist (2009)

A. Rey Satoshi Utsunomiya Javier Giménez I. Casas Joan de Pablo

The uranyl peroxide, studtite (UO4⋅4H2O, C2/c, Z = 4), is expected to form as a consequence of alpha radiolysis of water in contact with spent nuclear fuel (SNF) in a geologic repository. Investigation of its stability is, therefore, of critical importance because secondary U(VI) phases may incorporate trace amounts of radionuclides and thus retard their mobility away from a repository site. To examine the effect of ionizing radiation on uranyl peroxides, electron-beam irradiation experiments have been conducted on two synthetic uranyl peroxides: studtite and metastudtite (UO4⋅2H2O, Immm, Z = 2). All experiments were done using a transmission electron microscope (TEM) with an acceleration voltage of 200 kV at room temperature. The fluence required to completely amorphize studtite was 0.51-1.54 × 1017 e/cm2, which is equivalent to an absorbed dose of 0.73-1.43 × 107 Gy. Metastudtite becomes amorphous at a higher absorbed dose (1.31 × 107 Gy) than studtite, most likely because it contains fewer water molecules in its structure. These uranyl peroxides partially amorphize at doses that are one-tenth of the dose required for complete amorphization. With continued irradiation, uraninite nanocrystals form that are a few nanometers in diameter, at 4-20 × 1010 Gy. In a geologic repository, for spent nuclear fuel, the estimated absorbed doses due to ionizing radiation may be as high as 108-1011 Gy after 106 years. This is well in excess of doses in the laboratory experiments that caused the uranyl peroxides to become amorphous and decompose.

Uranyl

radiation damage

10.2138/am.2009.2908

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Citations (17)

Electron Microscopy Study of Mineral Colloids in the Ground Water Near Nevada Test Site

Microscopy and Microanalysis (2002)

Lu You L. M. Wang Satoshi Utsunomiya Rodney C. Ewing Annie B. Kersting

Journal Article Electron Microscopy Study of Mineral Colloids in the Ground Water Near Nevada Test Site Get access L P You, L P You Department of Nuclear Engineering and Radiological Science, University of Michigan, Ann Arbor, MI 48109-2104 Search for other works by this author on: Oxford Academic Google Scholar LM Wang, LM Wang Department of Nuclear Engineering and Radiological Science, University of Michigan, Ann Arbor, MI 48109-2104 Search for other works by this author on: Oxford Academic Google Scholar S Utsunomiya, S Utsunomiya Department of Nuclear Engineering and Radiological Science, University of Michigan, Ann Arbor, MI 48109-2104 Search for other works by this author on: Oxford Academic Google Scholar RC Ewing, RC Ewing Department of Nuclear Engineering and Radiological Science, University of Michigan, Ann Arbor, MI 48109-2104 Search for other works by this author on: Oxford Academic Google Scholar AB Kersting, AB Kersting Lawrence Livermore National Laboratory, PO Box 808, L-231, Livermore CA 94550 Search for other works by this author on: Oxford Academic Google Scholar P Zhao P Zhao Lawrence Livermore National Laboratory, PO Box 808, L-231, Livermore CA 94550 Search for other works by this author on: Oxford Academic Google Scholar Microscopy and Microanalysis, Volume 8, Issue S02, 1 August 2002, Pages 1558–1559, https://doi.org/10.1017/S1431927602107549 Published: 01 August 2002

10.1017/s1431927602107549

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Citations (0)

Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides: Effect of microbial cells on the oxidation of trivalent cerium

Geochimica et Cosmochimica Acta (2015)

Toshihiko Ohnuki Mingyu Jiang Fuminori Sakamoto Naofumi Kozai Shinya Yamasaki

XANES

Pseudomonas fluorescens

10.1016/j.gca.2015.04.043

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Citations (29)