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Affiliation |
Engineering educational research section Department of Applied Chemistry Program |
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Associate Professor |
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External Link |
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NABETANI Yu
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Degree 【 display / non-display 】
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Doctor (Engineering) ( 2007.3 Osaka University )
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修士（理学） ( 2003.3 関西学院大学 )
Research Areas 【 display / non-display 】
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Nanotechnology/Materials / Functional solid state chemistry
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Nanotechnology/Materials / Nanometer-scale chemistry
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Nanotechnology/Materials / Fundamental physical chemistry
Papers 【 display / non-display 】
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Nabetani Y., Hassan S.Z., Horiguchi H., Tachibana H., Inoue H., Shiragami T.
Journal of Physical Chemistry C 128 ( 3 ) 1423 - 1432 2024.1
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physical Chemistry C
A layered nanosheet hybrid composed of niobate nanosheet and polyfluoroalkyl azobenzene derivative (C3F-Azo-C6H) can undergo three-dimensional morphology change upon photo-irradiations. The unique photo-activated motion is based on the interlayer distance change and nanosheet sliding induced by the photo-isomerization of C3F-Azo-C6H which is presumably caused by the subsequent changes of the nanostructure in the hybrid. However, the mechanism of the morphological change at a molecular level has not yet been fully understood. The nanostructure and its delicate change in the layered hybrid should be closely related to the mechanism. Here, the nanostructure has been investigated in detail by X-ray diffraction, thermogravimetric/differential thermal analysis, and UV-vis and IR spectroscopy to get deeper insights into the mechanism of the photo-activated motion. Based on the intercalation amount, the molecular size, the clearance space, and the tilting angles, C3F-Azo-C6Hs are considered to align on the nanosheet and form an interdigitated bilayer structure in their terminal alkyl chains. The intercalated C3F-Azo-C6Hs also form a two-dimensional network having intermolecular hydrogen bonding among their amide groups and π-π interaction of azobenzene. Furthermore, it was revealed that the terminal alkyl chains located in the center of the bilayer are swung by the swayback motion of the isomerized azobenzene to induce the morphology change. The high-order architecture formed on the nanosheets should be a key factor in inducing the cooperative reaction and conformational change of C3F-Azo-C6H on the niobate nanosheet microenvironment.
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Recent Toxicological Study and Future Issue of Airborne Microplastics Reviewed
Wada Yurika, Kono Maori, Nabetani Yu, Ishihara Yasuhiro
Earozoru Kenkyu 38 ( 3 ) 181 - 186 2023.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Association of Aerosol Science and Technology
DOI： 10.11203/jar.38.181
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Polycyclic aromatic hydrocarbons in urban particle matter exacerbate movement disorder after ischemic stroke via potentiation of neuroinflammation Reviewed International coauthorship
Tanaka M., Okuda T., Itoh K., Ishihara N., Oguro A., Fujii-Kuriyama Y., Nabetani Y., Yamamoto M., Vogel C.F.A., Ishihara Y.
Particle and Fibre Toxicology 20 ( 1 ) 2023.2
Language：English Publishing type：Research paper (scientific journal) Publisher：Particle and Fibre Toxicology
Background: A recent epidemiological study showed that air pollution is closely involved in the prognosis of ischemic stroke. We and others have reported that microglial activation in ischemic stroke plays an important role in neuronal damage. In this study, we investigated the effects of urban aerosol exposure on neuroinflammation and the prognosis of ischemic stroke using a mouse photothrombotic model. Results: When mice were intranasally exposed to CRM28, urban aerosols collected in Beijing, China, for 7 days, microglial activation was observed in the olfactory bulb and cerebral cortex. Mice exposed to CRM28 showed increased microglial activity and exacerbation of movement disorder after ischemic stroke induction. Administration of core particles stripped of attached chemicals from CRM28 by washing showed less microglial activation and suppression of movement disorder compared with CRM28-treated groups. CRM28 exposure did not affect the prognosis of ischemic stroke in null mice for aryl hydrocarbon receptor, a polycyclic aromatic hydrocarbon (PAH) receptor. Exposure to PM2.5 collected at Yokohama, Japan also exacerbated movement disorder after ischemic stroke. Conclusion: Particle matter in the air is involved in neuroinflammation and aggravation of the prognosis of ischemic stroke; furthermore, PAHs in the particle matter could be responsible for the prognosis exacerbation.
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Kou Y., Nabetani Y., Nakazato R., Pratheesh N.V., Sato T., Nozawa S., Adachi S.i., Tachibana H., Inoue H.
Journal of Catalysis 405 508 - 519 2022.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Catalysis
The photoreduction of CO2 catalyzed by [fac-Re(dmbpy)(CO)3Cl] was precisely investigated through operando measurements of X-ray absorption fine structure spectroscopy (XAFS) and laser-flash FT-IR transient spectroscopy. In the early stage of the photoreaction, Re0-species assigned as penta-coordinated complex, [Re0(dmbpy)(CO)3], appeared and a delayed rise of ReII-species, [ReII(dmbpy)(CO)3CO2] (3)/[ReII(dmbpy)(CO)3COOH]+ (3′), were observed in XAFS measurements. The valence state of Re-center in the catalytic cycle changed as ReI → Re0 → ReII to be a clear evidence of an oxidative addition of CO2 to the Re0 center. In the laser-flash induced FT-IR measurements, a rise and decay of 3 followed by a delayed rise and decay of 3′ was observed. The second electron transfer from the carbon radical of triethylamine (TEA•) to 3′ induced the formation of [ReI(dmbpy)(CO)4]+ through [ReI(dmbpy)COOH]. The rate determining step of the catalytic cycle was revealed to be the protonation process of forming 3′ from 3.
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Ramakrishnan V., Nabetani Y., Yamamoto D., Tachibana H., Inoue H.
Physical Chemistry Chemical Physics 22 ( 14 ) 7201 - 7209 2020.2
Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Chemistry Chemical Physics
This journal is © the Owner Societies. We have previously found reversible photo-induced expansion and contraction of organic/inorganic clay hybrids, and even sliding of niobate nano-sheets at the macroscopic level of organic/inorganic niobate hybrids, induced by the molecular photo-isomerization of the polyfluoroalkylated azobenzene derivative (C3F-Azo-C6H) intercalated within the interlayer, which is viewed as an artificial muscle model unit. Based on systematic investigations of the steady state photo-isomerization and transient behavior of the reaction, we comprehended that the phenomena is caused by trapping of excess energy liberated during the isomerization, as well as the relaxation processes upon excitation of azobenzene chromophores in the interlayers of the hybrid. In this paper, quantitative estimation of transient 'heat' trapped in various microenvironments has been studied by each co-intercalation of temperature sensing dye molecules-rhodamine B (RhB) or tris(bipyridine)ruthenium(ii) chloride (Rubpy) with C3F-Azo-C6H within clay (SSA) nano-layers. The amount of dye molecules co-intercalated was kept to trace amounts that did not alter the bi-layered structure of the hybrid. The temperature of the microenvironment surrounding the probe molecules was estimated from the emission lifetime analysis. The evidently reduced emission lifetimes in C3F-Azo-C6H/SSA and C3H-Azo-C6H/SSA hybrids in the film state, indicated the elevation of temperature of the microenvironment upon excitation of the chromophores, which demonstrated our previous hypothesis rationalizing that the high reactivity of isomerization in the hybrid film state is caused by heat trapping via multi-step dissipation of the excess energy. With the hybrid of a hydrocarbon analogue (C3H-Azo-C6H), a distinct difference in temperature gradient was found to show the crucial role of the perfluoroalkyl chain of the surfactant that traps the excess energy to retard its dissipation leading to three-dimensional morphological motion.
DOI： 10.1039/c9cp05817f
Presentations 【 display / non-display 】
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アゾベンゼン/ナノシート複合体による光メカニカル機能材料の開発
森井 薫, 森田 晃代, 白上 努, 鍋谷 悠
第13回CSJ化学フェスタ2023 2023.10.17
Event date： 2023.10.17 - 2023.10.19
Language：Japanese Presentation type：Poster presentation
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粘土ナノシートに吸着したカチオン性スズポルフィリン錯体の光電子移動反応
大場 朋大, 白上 努, 鍋谷 悠
第13回CSJ化学フェスタ2023 2023.10.17
Event date： 2023.10.17 - 2023.10.19
Language：Japanese Presentation type：Poster presentation
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Fabrication and photo-induced winding and unwinding motion of novel photo-responsive nanoscroll
Y. Iwata, K. Sakai, K. Koganemaru, T. Shiragami, Y. Nabetani
Annual Meeting on Photochemistry 2023 2023.9.6
Event date： 2023.9.6 - 2023.9.7
Language：Japanese Presentation type：Poster presentation
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Additive Effects of Metal Cations on the Singlet Oxygen Formation Sensitized by Germanium-N-Confused Porphyrin Complex
H. Takeda, Y. Nabetani, T. Shiragami
Annual Meeting on Photochemistry 2023 2023.9.6
Event date： 2023.9.6 - 2023.9.7
Language：Japanese Presentation type：Poster presentation
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Photo-activated winding and unwinding motion of nanoscroll composed of niobate nanosheet and polyfluoroalkyl azobenzene derivative International conference
Y. Iwata, K. Sakai, T. Shiragami, Y. Nabetani
The 31st International Conference on Photochemistry (ICP2023) 2023.7.26
Event date： 2023.7.23 - 2023.7.28
Language：English Presentation type：Poster presentation
Awards 【 display / non-display 】
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8th Asian Photochemistry Conference (APC-2014), Poster prize
2014.11 Asian Photochemistry Conference
Yu Nabetani
Award type：Award from international society, conference, symposium, etc. Country：Japan
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日本化学会第88春季年会優秀講演賞（学術）
2008.4 日本化学会 光応答性スパイラルナノチューブの形態ダイナミクス
鍋谷 悠
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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キラルナノ層状構造の構築と光運動機能発現のメカニズム解明
Grant number：23K04538 2023.04 - 2026.03
独立行政法人日本学術振興会 科学研究費基金 基盤研究（C）
Authorship：Principal investigator
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新規光応答性ナノスクロールの作製と光伸縮機構の解明
Grant number：20K05267 2020.04 - 2023.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
本研究では、チタン酸やチタンニオブ酸などのニオブ酸とは異なる表面構造をもつナノシートに注目し、多フッ素化アルキルアゾベンゼンとの複合化によって、光伸縮運動を示す新たな光応答性ナノスクロールを作製する。ナノシート表面構造によりナノスクロール内部の構造を制御して原子間力顕微鏡等により光伸縮運動を解析する。また、分子構造の視点からアルキル鎖長を変えたアゾベンゼンの導入により複合体の物性を制御し、ナノスクロールが示す光運動機能の発現機構を解明する。
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タンパク質結晶細孔をテンプレートとした三次元組織化複合ナノ構造材料の創生
Grant number：20K05269 2020.04 - 2023.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(C)
Authorship：Coinvestigator(s)
タンパク質の機能や構造を知るため細心の注意を持って作られるタンパク質の結晶は、その内部に三次元状に広がる溶媒チャンネルはナノメートルサイズの細孔構造を有している。その細孔は表面のタンパク質に由来する不均一な空間であるため、タンパク質結晶は新規かつ高機能な多孔質材料であるといえる。我々はこれまでこのタンパク質結晶細孔への分子導入を明らかにし、その機能と有用性を実証してきた。本研究計画ではこれを発展させ、タンパク質結晶をテンプレートとすることで新たな光学特性を発現する三次元的複合ナノ構造材料を作り出す。同時に顕微鏡観察技術を駆使しタンパク質結晶の多孔質材料・反応容器としての機能を明らかにする。
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水の酸化光触媒機能を有する人工光合成システム
2016.10 - 2017.03
科学研究費補助金 新学術領域研究
Authorship：Coinvestigator(s)
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光応答性ナノシート積層膜が示すフォトメカニカル機能の機構解明
2012.04 - 2014.03
科学研究費補助金 若手研究(B)
Authorship：Principal investigator