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Lithium insertion to distorted ReO3-type metastable solid solution NbxW1−xO3−x/2 (0≤x<0.25) has been studied by chemical and electrochemical methods. In the course of lithium insertion into tetragonal compounds, transition to a cubic phase was found to occur in the region where values of y (in LiyNbxW1−xO3−x/2) fall between 0.2 and 0.3, and the phase transition was found to depend on the conditions of the reaction. Changes in OCV and lattice parameters in tetragonal region (y<0.2) were discussed from the viewpoint of the ordering of lithium ions. Also, the component diffusion coefficient of lithium in tetragonal compounds Li0.1NbxW1−xO3−x/2 (0≤x≤0.23) was found to increase with niobium content when x≤0.10, and to saturate at 4×10−9 cm2/s. 相似文献
34.
Hirotoshi Sakaino Brigitte A. G. Lamers Stefan C. J. Meskers E. W. Meijer Ghislaine Vantomme 《Journal of polymer science. Part A, Polymer chemistry》2021,59(12):1131-1141
Materials with highly ordered nanoscale structures can translate molecular processes to macroscopic function. Here we report on the photo-controlled organization of achiral alternating copolymers composed of discrete length blocks showing well-defined sub-10 nm morphologies. These alternating copolymers consist of main-chain azobenzene building blocks alternating with discrete oDMS blocks of various precise lengths. Remarkably, we demonstrate the imprinting of a stable helical molecular arrangement in spin-casted thin films by irradiation with circularly polarized light, without chiral dopant or plasticizer required. By following the out-of-equilibrium photo-switching process over irradiation time, the mechanism of molecular reorganization is unraveled and rationalized with the nature of the morphology. Linear photo-organization is preferentially reached with flexible and symmetric cylindrical structures while helical photo-organization is most easily obtained with robust but rotatable lamella structures. These findings suggest that precision in the synthesis and assembly of alternating copolymers can lead to complete control over molecular organization and main-chain motion. 相似文献
35.
Haijun Yu Prof. Jihuai Wu Prof. Jianming Lin Dr. Leqing Fan Miaoliang Huang Youzhen Lin Yan Li Fuda Yu Zhaoyuan Qiu 《Chemphyschem》2013,14(2):394-399
In order to achieve pesudocapacitive performance of single‐wall carbon nanotube (SWCNT) electrodes, a high‐efficient and reversible redox strategy utilizing a redox‐mediated electrolyte for SWCNT‐based supercapacitors is reported. In this novel redox‐mediated electrolyte, the single‐electrode specific capacitance of the supercapacitor is heightened four times, reaching C=162.66 F g?1 at 1 A g?1. The quick charge‐discharge ability of the supercapacitor is also enhanced, and the relaxation time is as low as 0.58 s. Furthermore, the supercapacitor shows an excellent cycling performance of 96.51 % retention after 4000 cycles. The remarkable results presented here illustrate that the redox strategy is a facile and straightforward approach to improve the performances of SWCNT electrodes. 相似文献
36.
Hirotoshi Sano 《Hyperfine Interactions》1990,53(1-4):97-112
Typical experimental results which demonstrate the applicability of Mössbauer spectroscopy to the studies of mixed-valence states of iron atoms are described, especially on biferrocenium and disubstituted biferrocenium salts, which show essentially no appreciable line-broadening at temperatures where the valence-state changes from a trapped to an averaged valence state. The Mössbauer spectroscopic data are compared with some of the results of X-ray crystal structure measurements. An order-disorder transition in valence-state is suggested as one of the plausible explanations for the temperature dependence of the Mössbauer spectrum. Suggestive results of the studies on oxo-centered trinuclear iron carboxylate complexes are also briefly mentioned. 相似文献
37.
You Osanai Eiko Soejima Takeshi Noro Hirotoshi Mori Ma San Mon Mariusz Klobukowski Eisaku Miyoshi 《Chemical physics letters》2008,463(1-3):230-234
We have produced new relativistic model core potentials (spdsMCPs) for the second-row transition-metal atoms from Y to Cd treating explicitly 4s and 4p electrons in addition to 4d and 5s electrons in the same manner as for the first-row transition-metal atoms given in [Y. Osanai, M.S. Mon, T. Noro, H. Mori, H. Nakashima, M. Klobukowski, E. Miyoshi, Chem. Phys. Lett. 452 (2008) 210]. Using suitable correlating functions together with the split valence MCP functions, we demonstrate that the present MCP basis sets show reasonable performance in predicting the electronic structures of atoms and molecules, bringing about accurate excitation energies for atoms and reasonable spectroscopic constants for AgH. 相似文献
38.
Dr. Hiroshi Takikawa Dr. Arata Nishii Dr. Hiromu Takiguchi Hirotoshi Yagishita Masato Tanaka Dr. Keiichi Hirano Prof. Dr. Masanobu Uchiyama Prof. Dr. Ken Ohmori Prof. Dr. Keisuke Suzuki 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(30):12540-12544
An intramolecular benzyne–phenolate [4+2] cycloaddition is reported. Benzyne precursors, having vicinal halogen-sulfonate functionalities, linked with a phenol(ate) by various tether groups undergo efficient intramolecular [4+2] cycloaddition by treatment with either Ph3MgLi or nBuLi for halogen–metal exchange to form various benzobarrelenes. 相似文献
39.
Kida M Hori A Sakagami H Takeya S Kamata Y Takahashi N Ebinuma T Narita H 《The journal of physical chemistry. A》2011,115(5):643-647
Experimental NMR measurements for (13)C chemical shifts of propane molecules encaged in 16-hedral cages of structure II clathrate hydrate were conducted to investigate the effects of guest-host interaction of pure propane clathrate on the (13)C chemical shifts of propane guests. Experimental (13)C NMR measurements revealed that the clathrate hydration of propane reverses the (13)C chemical shifts of methyl and methylene carbons in propane guests to gaseous propane at room temperature and atmospheric pressure or isolated propane, suggesting a change in magnetic environment around the propane guest by the clathrate hydration. Inversion of the (13)C chemical shifts of propane clathrate suggests that the deshielding effect of the water cage on the methyl carbons of the propane molecule encaged in the 16-hedral cage is greater than that on its methylene carbon. 相似文献
40.
Sawayama J Sakaino H Kabashima S Yoshikawa I Araki K 《Langmuir : the ACS journal of surfaces and colloids》2011,27(14):8653-8658
By mixing a small volume of THF containing guanosine derivative 1 and tetraethylenegrycol dodecyl ether (TEGDE) with water and subsequently removing TEGDE by gel permeation chromatography, micrometer-sized giant unilamellar vesicles (GUV) of 1 were successfully prepared. The vesicle membrane was a 2-D sheet assembly of thickness 2.5 nm, composed of a 2-D inter-guanine hydrogen-bond network. The GUV dispersion showed high stability because of a large negative zeta potential, which allowed repeated sedimentation and redispersion by centrifugation and subsequent gentle agitation. TEGDE-triggered fusion of GUVs took place within 350 ms, which proceeded by fusion of the vesicle membranes in contact. These unique static and dynamic properties of the GUV membrane assembled by the 2-D hydrogen-bond network are discussed. 相似文献