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Size-Control Synthesis and Luminescence Properties of Eu(III) Coordination Particles
No full textThe particle-size-controlled synthesis and photophysical properties of Eu(III) coordination polymers [Eu(hfa)_3(m-dpb)]_n (hfa: hexafluoroacetylacetonato, m-dpb: 1,3-bis(diphenylphosphoryl)benzene) were reported. The Eu(III) coordination polymers were prepared by complexation of [Eu(hfa)_3(H_2O)_2] and the linker m-dpb ligand in an aqueous micelle solution using cationic CTAB (cetyltrimethylammonium bromide) and anionic SDS (sodium dodecyl sulfate) surfactants. The size of Eu(III) coordination polymers was gradually decreased by increasing CTAB concentrations. The crystal structure formed in a micelle system was different from bulk coordination polymers. The Eu(III) coordination particles showed a smaller nonradiative rate constant than bulk coordination polymers. In this study, size control and luminescence properties of the Eu(III) coordination particles have been demonstrated.This work was supported by JSPS KAKENHI Grant Numbers JP20H02748, JP20K21201, JP21K18969, JP22H02152, JP22H04516, JP22K14741, and JP23K17925 of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. This work was also supported by the Institute for Chemical Reaction Design and Discovery (ICReDD), established by the World Premier International Research Initiative (WPI), Japan. The authors express sincere thanks to Prof. Hajime Ito of Hokkaido University for measurements of X-ray diffraction. A part of this work was conducted at the Laboratory of XPS analysis, Joint-use facilities, Hokkaido University.journal articl
Properties of Composite Electrodes for All-solid-state Fluoride-ion Secondary Batteries Processed by High-pressure Torsion
No full textAll-solid-state fluoride-ion batteries (FIBs) using metal/metal fluorides are expected to be the next generation of storage batteries because they exhibit high volumetric energy densities by utilizing multielectron reactions, compared to the current lithium-ion batteries. However, method of fabricating a composite electrode for all-solid-state fluoride-ion batteries has not yet been established. A fabrication method for a composite electrode that disperses the active material and solid electrolyte is required. To approach this problem, in this study, we employed a high-pressure torsion (HPT) method, in which an active material, solid electrolyte, and conductive agent can be mixed with size reduction, as a new process and prepared Cu (active material)/PbSnF4 (solid electrolyte)/acetylene black (conductive agent) cathode composites. The crystalline sizes of Cu and PbSnF4 were significantly reduced. The apparent grain boundary resistance was also reduced owing to the more homogeneous distribution in the cathode composites after HPT processing. These structural and morphological changes led to high electrochemical performances, compared to a cathode composite without HPT.journal articl
Potassium-rich antiperovskites K<sub>3</sub>HTe and K<sub>3</sub>FTe and their structural relation to lithium and sodium counterparts
No full textUnlike perovskite oxides, antiperovskites M3HCh and M3FCh (M = Li, Na; Ch = S, Se, Te) mostly retain their ideal cubic structure over a wide range of compositions owing to anionic size flexibility and low-energy phonon modes that promote their ionic conductivity. In this study, we show the synthesis of potassium-based antiperovskites K3HTe and K3FTe and discuss the structural features in comparison with lithium and sodium analogues. It is shown experimentally and theoretically that both compounds maintain a cubic symmetry and can be prepared at ambient pressure, in contrast to most of the reported M3HCh and M3FCh which require high pressure synthesis. A systematic comparison of a series of cubic M3HTe and M3FTe (M = Li, Na, K) revealed that telluride anions contract in the order of K, Na, Li, with a pronounced contraction in the Li system. This result can be understood in terms of the difference in charge density of alkali metal ions as well as the size flexibility of Ch anions, contributing to the stability of the cubic symmetry.journal articl
1950年代前半の保健教科書研究のための参考資料(3):1950年代前半の高等学校保健教科書の単元構成と性教育関連記載事項
Get PDF日本保健科教育学会第8回研究大会(2023年12月17日, 鎌倉女子大学)講演用資料(功刀俊雄)conference objec
1950年代前半の保健教科書研究のための参考資料(7):1956年の中学校の保健学習に関する通達を先取りしていると思われる教科書
Get PDF日本保健科教育学会第8回研究大会(2023年12月17日, 鎌倉女子大学)講演用資料(功刀俊雄)conference objec
1950年代前半の保健教科書研究のための参考資料(8):1956年の高等学校学習指導要領保健体育科編関連資料
Get PDF日本保健科教育学会第8回研究大会(2023年12月17日, 鎌倉女子大学)講演用資料(功刀俊雄)conference objec
【内容の要旨及び審査の結果の要旨】呼吸特徴量を用いた時系列分析による心拍間隔の欠損補完とその評価
Get PDF奈良女子大学博士(工学)博士論文本文はやむを得ない事由により非公開。【博士論文本文の要約】http://hdl.handle.net/10935/5963doctoral thesi
CRAFTと解像度ピラミッドを用いた近代書籍用レイアウト解析に関する研究
Get PDF奈良女子大学博士(情報科学)「博士論文本文」および「内容の要旨及び審査の結果の要旨」を公開doctoral thesi
