Rare earth Sm~+ ion doped potassium hydrogen phthalate(KHP) single crystal was grown by slow evaporation technique.Single crystal and powder X-ray diffraction analyses confirm the crystalline perfection of Sm~+ ion doped KHP crystal.The functional groups of pure and Sm~+ ion doped KHP crystals were identified by Fourier transform infrared spectroscopy(FTIR) spectral studies.Thermogravimetric and differential thermal analyses were carried out to study the thermal behavior of the grown crystals.UV—Vis studies explored the optical transmittance of the grown crystals in the entire visible region.The mechanical strength and etching studies were performed to assess the perfection of the pure and Sm~+ ion doped KHP crystals.The refractive index and birefringence properties of the grown crystal were analyzed.The second harmonic generation efficiency of Sm~+ ion doped KHP crystals was observed by Kurtz—Perry powder test. 相似文献
In this work, a facile, one-pot route has been applied to synthesize nanohybrids based on mixed oxide NiFe2O4 and reduced graphene oxide （rGO）. The hybrid is constructed by nanosized NiFe2O4 crystals confined by few- layered rGO sheets. The formation mechanism and microstructure of the hybrids have been clarified by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. Electrochemical tests show that the performance of NiFe2O4 can be considerably improved by rGO incorporation. The performance improvement can be attributed to the two-dimensional conductive channels and the unique hybrid structure rGO constructed. The easy synthesis and good electrochemical performance of NiFe2O4/rGO hybrid make it a promising anode material for Li-ion batteries. 相似文献
Systematic analysis about the exploitation of imidazolium based ionic liquids（ILs）,[BMIM]BF4[IL1],[EMIM]BF4 [IL2]and[BMIM]PF6[IL3]as the morphological template on the basic sol-gel method adopted synthesis of nanostructured zinc oxide（ZnO） is presented.X-ray diffraction（XRD）,particle size analysis（PSA） and scanning electron microscopy（SEM） have been employed for the characterization of structure and morphology of the synthesized ZnO particles.Well-defined capsule like shaped morphology with lower nanosize is observed for the ZnO nanoparticles with IL1 than those with IL2 and IL3.This confirms that IL1 served as an effective templating material due to their unique properties.Especially the effective aggregation of ZnO particles with a self-organized frame of IL1 was the essential factor to produce the lower nanosized ZnO with capsule shaped structure.The synthesized ZnO samples with IL2 and IL3 fabricated the flake like shaped and rod like shaped morphologies in the range of nanoscale.The formed ZnO nanoparticles with IL2 exhibit higher nanosize than the ZnO nanoparticles produced by IL1,owing to shorter length of alkyl group in its cation which restricts steric effect and permits the nanoparticles to grow longer.Even though IL3 produced the discrete ZnO nanorods,the hydrophobic nature of IL3 created the higher nanosize than the ZnO nanoparticles formed by other two ionic liquids.Antibacterial properties of the synthesized ZnO nanostructures were investigated against Staphylococcus aureus（gram positive） and Escherichia coli（gram negative） bacteria by Agar diffusion test method.Microbial experiments indicate that the synthesized ZnO samples show a wide spectrum of antimicrobial activities and performed better against S.aureus than E.coli with the same concentration of ZnO. 相似文献
In this work,water-based precursor solutions suitable for dip-coating of thick La2Zr2O7（LZO） buffer layers for coated conductors on Ni-5%W substrates with an inclusion of polymeric polyvinyl pyrrolidone were developed.The effect of varying percentage of the polymer addition on the preparation of the deposited films with maximum crack-free thickness was investigated.This novel water-based chemical solution deposition method involving polymers in two different chelate-chemistry compositions revealed the possibility to grow single,crack-free layers with thicknesses ranging from 140 to 280 nm,with good crystallinity and epitaxial growth.The effect of increasing polymer concentrations on the morphology and the structure of the films was studied.The appropriate buffer layer action of the films in preventing Ni diffusion was studied by X-ray photoelectron spectroscopy. 相似文献
Differential scanning calorimetry(DSC) analysis, isothermal solidification experiment and Thermo-Calc simulation were employed to investigate solidification characteristics of K417 G Ni-base superalloy. Electron probe microanalysis(EPMA) was employed to analyze the segregation characteristics. Liquidus,solidus and the formation temperatures of main phases were measured. In the process of solidification,the volume fraction of liquid dropped dramatically in the initial stage, while the dropping rate became very low in the final stage due to severe segregation of positive segregation elements into the residual liquid. The solidification began with the formation of primary γ. Then with solidification proceeding, Ti and Mo were enriched in the liquid interdendrite, which resulted in the precipitation of MC carbides in the interdendrite. Al accumulated into liquid at the initial stage, but gathered to solid later due to the precipitation of γ/γ’ eutectic at the intermediate stage of solidification. However, Co tended to segregate toward the solid phase. In the case of K417 G alloy, combining DSC analysis and isothermal solidification experiment is a good way to investigate the solidification characteristics. Thermo-Calc simulation can serve as reference to investigate K417 G alloy. 相似文献
Despite increasing interest in mechanical seals, widespread use of packing (Figure 1
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Figure 1. Packing is made from materials such as Nomex, Kevlar, polytetrafluoroethylene, carbon and graphite and can be cut to the required size.) is still seeing many companies unknowingly incur unnecessary maintenance costs and, in some cases, even causing health and safety concerns. This article examines why mechanical seals provide a more efficient solution to such a problem. 相似文献
