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Ara, Kuniaki; Sugiyama, Kenichiro*; Kitagawa, Hiroshi*; Nagai, Masahiko*; Yoshioka, Naoki*
Journal of Nuclear Science and Technology, 47(12), p.1165 - 1170, 2010/12
Times Cited Count：11 Percentile：59.22(Nuclear Science & Technology)A study on the chemical reactivity control of sodium utilizing the atomic interaction of sodium with suspended nanoparticles was carried out. The atomic interaction between nanoparticles and sodium atoms were estimated by theoretical calculations and verified by fundamental physical properties measurements. Results showed the atomic bond of the sodium atom and the nanoparticle atom was significantly larger than that of the sodium atoms, when the transition metals that have the property of large electronegativity are applied as nanoparticles. From the theoretical calculation results, it was suggested that charge transfer occurs from the sodium atom to the nanoparticle atom. The fundamental physical properties of sodium with suspended nanoparticles were examined in comparison with that of sodium to verify the change of the atomic interaction. From the experimental results, it became clear that the surface tension becomes larger and the evaporation rate becomes smaller. These changes in fundamental physical properties were measured to verify the stability of the atomic interaction under the conditions of wide temperature range and the phase transformation from solid phase to liquid phase.
Ara, Kuniaki; Sugiyama, Kenichiro*; Kitagawa, Hiroshi*; Nagai, Masahiko*; Yoshioka, Naoki*
Journal of Nuclear Science and Technology, 47(12), p.1171 - 1181, 2010/12
Times Cited Count：10 Percentile：56.32(Nuclear Science & Technology)A study was conducted on the control of the chemical reactivity of sodium utilizing the atomic interaction between sodium and nanoparticles. The authors reported in a previous paper that the atomic interaction between sodium and nanoparticles increases and has the potential to suppress chemical reactivity. In this paper, the authors examined the released reaction heat and the reaction behavior. As a result, it was confirmed that the released reaction heat and the reaction rate decreased. From the results of experimental studies, it is clear that the suppressions of chemical reactivity are caused by a change in the sodium evaporation rate and fundamental physical properties such as surface tension which originate in the change in the atomic interaction between sodium and nanoparticle atoms. The suppression of chemical reactivity applying to FBR coolant was estimated for the case of sodium combustion and sodium-water reaction. It was confirmed that the concept of suspending nanoparticles into sodium has high potential for the suppression of chemical reactivity. Applicability as coolant to the FBR was investigated, including not only the chemical reaction properties but also the aspects of heat transfer and operation.
Saito, Junichi; Ara, Kuniaki; Fukunaga, Koichi*; Ogata, Kan*; Nagai, Masahiko*; Oka, Nobuki*; Kitagawa, Hiroshi*; Yamauchi, Miho*
no journal, ,
no abstracts in English
Saito, Junichi; Ara, Kuniaki; Nagai, Masahiko*; Fukunaga, Koichi*; Kitagawa, Hiroshi*; Yamauchi, Miho*; Oka, Nobuki*
no journal, ,
no abstracts in English
Saito, Junichi; Ara, Kuniaki; Fukunaga, Koichi*; Oka, Nobuki*; Nagai, Masahiko*
no journal, ,
no abstracts in English
Saito, Junichi; Fukunaga, Koichi*; Oka, Nobuki*; Nagai, Masahiko*; Ara, Kuniaki
no journal, ,
no abstracts in English
Fukunaga, Koichi*; Nagai, Masahiko*; Ara, Kuniaki; Saito, Junichi
no journal, ,
no abstracts in English
Saito, Junichi; Yoshioka, Naoki*; Nagai, Masahiko*; Ara, Kuniaki
no journal, ,
Ara, Kuniaki; Miyamoto, Akira*; Nagai, Masahiko*; Yoshioka, Naoki*
no journal, ,
no abstracts in English
Ara, Kuniaki; Miyamoto, Akira*; Nagai, Masahiko*; Kurita, Koichi*
no journal, ,
no abstracts in English
荒 邦章; 斉藤 淳一
佐藤 裕之*; 岡 伸樹*; 永井 正彦*; 福永 浩一*
JP, 2010-041415 
Patent licensing information Patent publication (In Japanese)
【課題】アルカリ液体金属中にナノ粒子を分散させるに際して、ナノ粒子の凝集、沈降がなく、かつ、時間が経過しても安定的にナノ粒子の分散を維持するナノ粒子を分散したアルカリ液体金属を得る。 【解決手段】アルカリ液体金属にナノ粒子を分散させるナノ粒子分散アルカリ液体金属の製造方法であって、前記アルカリ液体金属にナノ粒子を物理的な作用によって攪拌する粗分散工程と、前記粗分散工程の後、前記アルカリ液体金属に超音波を照射してナノ粒子を分散させる分散工程と、を行なうことにより、アルカリ液体金属にナノ粒子を分散させたアルカリ液体金属を製造するものであり、アルカリ液体金属が、リチウム、ナトリウム、カリウム等であり、ナノ粒子は、チタン、バナジウム、クロム、鉄、コバルト、ニッケル、ならびに銅のいずれかよりなる。
荒 邦章; 斉藤 淳一
佐藤 裕之*; 永井 正彦*; 西 敏郎*; 福永 浩一*
JP, 2013-166232 Patent licensing information Patent publication (In Japanese)
【課題】原子炉、プラント等の冷却材として利用されるナノ粒子分散液体アルカリ金属の濃度制御を、ナノ粒子分散液体アルカリ金属の濃度の変化に即時対応できるナノ粒子分散液体アルカリ金属の濃度制御方法を提供する。 【解決手段】ナノ粒子分散液体アルカリ金属の濃度としてナノ粒子分散濃度、ナノ粒子径ならびにナノ粒子個数を取得する濃度取得手段と、濃度取得手段によって取得された取得濃度が、予め基準化された基準濃度と比較することで、前記ナノ粒子分散液体アルカリ金属を濃縮するか、希釈するかの判定を行い、濃縮装置あるいは希釈装置に対して運転条件を決定する濃縮・希釈量設定手段とを有するナノ粒子分散液体アルカリ金属の濃度制御方法である。
