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941.
Qiu Danfeng Xu Zijing Zheng Mingbo Zhao Bin Pan Lijia Pu Lin Shi Yi 《Journal of Solid State Electrochemistry》2012,16(5):1889-1892
Graphene is an excellent substrate to load nanomaterials for energy applications due to its large surface area, excellent
conductivity, mechanical strength, and chemical stability. In this study, thermal exfoliated functionalized graphene sheets
with good conductivity and high BET surface area are anchored with mesoporous NiO nanoplates by in situ chemical synthesis
approach. Electrochemical characterization shows that functionalized graphene sheets–NiO sample exhibits a high capacity of
about 700 mAh/g at a discharge current density of 100 mA/g and a good cycling ability. The high capacity and good cycling
ability of functionalized graphene sheets –NiO material were attributed to the intimate interaction between the graphene sheets
and NiO nanoplates. The graphene sheets not only enhance the conductivity of NiO nanoplates but also improve the structure
stability of NiO nanoplates. Furthermore, the mesoporous structure of NiO nanoplates is available to the transfer of electrolyte.
Such functionalized graphene sheets–NiO nanocomposite could be a promising candidate material for a high-capacity, low cost,
and nontoxic anode for lithium-ion batteries. 相似文献
942.
Kazuhiro Yamamoto Hiroshi Katagiri Hiroki Tairabune Yuji Yamaguchi Yong-Jin Pu Ken-ichi Nakayama Yoshihiro Ohba 《Tetrahedron letters》2012,53(14):1786-1789
The syntheses of naphtho[2,3-b:7,6-b′]- and naphtho[2,1-b:5,6-b′]bisbenzo[b]thiophenes (NBBTs) are achieved via inter- and intramolecular stepwise Friedel–Crafts-type reactions. The structural curvature of these NBBTs are found to improve their solubility in organic solvents, and to form well-defined herringbone structures in single crystals, especially when the C2v symmetrical naphtho[2,3-b:7,6-b′]bisbenzo[b]thiophene takes the form of asymmetric space groups in a parallel direction with each other, and having exhibited OFET characteristics with a hole mobility of 7 × 10?5 cm2 V?1 s?1. 相似文献
943.
壳聚糖-树枝状大分子杂化物主要包括壳聚糖-(聚酰胺-胺)[CS-PAMAM]、壳聚糖-聚乙烯亚胺[CS-PEI]、壳聚糖-3,4,5-三(p-十二烷氧基苄氧基)苯甲酸[CS-DOBOB酸]、壳聚糖-3,4,5-三(p-十二烷氧基-m-甲氧基苄氧基)苯甲酸(DOVOB酸)、壳聚糖-聚丙三醇(PGLD)等树枝状大分子杂化物。壳聚糖-树枝状大分子杂化物具有良好的水溶性、生物可降解性、抗菌性、吸附性和热致液晶性等性能。壳聚糖-树枝状大分子杂化物的用途广泛,可作为金属离子的吸附剂、治疗高胆红素血症的吸附材料、新型荧光材料、抗菌剂和抗凝血剂等。本文综述了壳聚糖-树枝状大分子杂化物的研究进展,并展望了其未来研究方向和应用前景。 相似文献
944.
Wang G Zhang X Geng J Li K Ding D Pu KY Cai L Lai YH Liu B 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(31):9705-9713
A glucopyranose functionalized star-shaped oligomer, N-tris{4,4',4'-[(1E)-2-(2-{(E)-2-[4-(benzo[d]thiazol-2-yl)phenyl]vinyl}-9,9-bis(6-2-amido-2-deoxy-1-thio-β-D-glucopyranose-hexyl)-9H-fluoren-7-yl)vinyl]phenyl}phenylamine (TVFVBN-S-NH(2)), is synthesized for two-photon fluorescence imaging. In water, TVFVBN-S-NH(2) self-assembles into nanoparticles with an average diameter of ~49?nm and shows a fluorescence quantum yield of 0.21. Two-photon fluorescence measurements reveal that TVFVBN-S-NH(2) has a two-photon absorption cross-section of ~1100 GM at 780?nm in water. The active amine group on the glucopyranose moiety allows further functionalization of TVFVBN-S-NH(2) with folic acid to yield TVFVBN-S-NH(2) FA with similar optical and physical properties as those for TVFVBN-S-NH(2). Cellular imaging studies reveal that TVFVBN-S-NH(2) FA has increased uptake by MCF-7 cells relative to that for TVFVBN-S-NH(2), due to specific interactions between folic acid and folate receptors on the MCF-7 cell membrane. This study demonstrates the effectiveness of glycosylation as a molecular engineering strategy to yield water-soluble materials with a large two-photon absorption (TPA) cross-section for targeted cancer-cell imaging. 相似文献
945.
Hong Yan Wang Pu Su Zhao Jie Song Rong Qing Li 《Journal of chemical crystallography》2011,41(3):379-385
Abstract
A new Schiff base ligand of 1-(2, 6-dichlorobenzylidene)-4-phenylthiosemicarbazide(C14H11Cl2N3S) has been synthesized, which crystallizes in monoclinic, space group C2/c with a = 18.551(7) ?, b = 6.963(3) ?, c = 23.185(9) ? and β = 93.122(6)o. The reaction of this ligand with NiAc2·4H2O gives two different Ni(II) complexes, one is general traditional mononuclear and another is unexpected trinuclear, where another quadridentate ligand of 1-(amino-N-phenylmethanethio)-4-phenyl-thiosemicarbazide(C14H14N4S2) is found. The mononuclear complex (C32H26Cl4N8NiS2) crystallizes in triclinic, space group P−1 with a = 11.071(2) ?, b = 11.157(2) ?, c = 15.302(3) ?, α = 76.214(2)o, β = 87.902(2)o and γ = 79.586(3)o. The trinuclear complex (C60H50Cl4N16Ni3S6) crystallizes in orthorhombic, space group Pbcn with a = 19.673(3) ?, b = 16.094(3) ? and c = 20.465(4) ?. In above three compounds, there are some hydrogen bonds which help to construct the three dimensional net works and stabilize the molecular structures. 相似文献946.
Abstract A novel approach to implement high flattened comb filters with precise channel spacing based on DC phase compensation is proposed. Channel wavelength error and peak reflectivity variation are discussed and calculated. A phase compensation method by simply changing the DC refractive index is proposed. Fiber Bragg gratings with different DC phase shifts are fabricated, which indicates that an arbitrary DC phase shift can be introduced precisely. A high flattened comb filter with precise 50-GHz channel spacing is realized with the help of a micrometer-precision translation stage. Then the peak reflectivity variation with and without phase compensation for different chirp coefficients is researched. 相似文献
947.
An experimental system aimed at n-γ discrimination using the zero-crossing method with a φ3’’×2’’ BC501A liquid scintillation detector was established and tested with an Am-Be neutron source. Two-dimensional plots of energy versus zero-crossing time were obtained. The quality of n-γ discrimination was checked by the figure-of-merit (FOM), the neutron peak-to-valley ratio, and the proportion of leaked neutrons over all neutron events. The performance of n-γ discrimination in terms of FOM was compared with previous work done by other groups. The n-γ discrimination in four different energy regions with an interval of 0.1 MeV between 0.3 MeV and 0.7 MeV was studied, and the results indicate that the n-γ discrimination threshold can go down to 0.4 MeV. 相似文献
948.
Junbo Deng Lu Pu Haibao Mu Guanjun Zhang Shigeyasu Matsuoka Akiko Kumada Kunihiko Hidaka 《Journal of Electrostatics》2013,71(4):739-745
The charge density distribution of the surface leader has never been measured before. Because the surface leader usually covers a long distance, and the surface potential caused by leader discharge is usually very high, this creates difficulties in measuring the potential distribution of the surface leader. In this paper, with a feedback type electrostatic probe based on a field-nullify technique, a charge density distribution scanning system is developed. A two-layer structure pipe is designed to lower the surface potential after discharge. In this way, the surface potential distribution caused by the residual charge of the leader discharge under the application voltage as high as to 40 kV can be measured. The surface charge density distribution including the leader and streamer is perfectly measured, which is in good agreement with the photograph. 相似文献
949.
Robustness analysis of static routing on networks 总被引:1,自引:0,他引:1
Robustness is one of the crucial properties that needs to be considered in the design of routing strategies on networks. We study the robustness of three typical routing strategies, which are the SP (shortest path), EP (efficient path), and OP (optimal path) strategies, by simulating several different kinds of attacks including random attacks, target attacks and cascading failures on scale-free networks. Results of the average path length, betweenness centrality, network capacity, etc., demonstrate that the EP strategy is more robust than the other two, and the OP strategy is more reliable than the SP strategy in general. However, on the power-grid network, the OP strategy is more resistant against cascading failures than the EP and SP strategies. 相似文献
950.
Shengli Pu Haotian Wang Ning Wang Xianglong Zeng 《Applied physics. B, Lasers and optics》2013,112(2):223-229
A line-defect waveguide within a two-dimensional magnetic-fluid-based photonic crystal with 45o-rotated square lattice is presented to have excellent slow light properties. The bandwidth centered at $ \lambda_{0} $ = 1,550 nm of our designed W1 waveguide is around 66 nm, which is very large than that of the conventional W1 waveguide as well as the corresponding optimized structures based on photonic crystal with triangular lattice. The obtained group velocity dispersion $ \beta_{2} $ within the bandwidth is ultralow and varies from ?1,191 $ a/(2\pi c^{2} ) $ to 855 $ a/(2\pi c^{2} ) $ (a and c are the period of the lattice and the light speed in vacuum, respectively). Simultaneously, the normalized delay-bandwidth product is relatively large and almost invariant with magnetic field strength. It is indicated that using magnetic fluid as one of the constitutive materials of the photonic crystal structures can enable the magnetically fine tunability of the slow light in online mode. The concept and results of this work may give a guideline for studying and realizing tunable slow light based on the external-stimulus-responsive materials. 相似文献