Spindle-like Ag/ZnO heterostructure composites were synthesized through a solution-based surface modification method, during which Ag nanoparticles were deposited on the surfaces of ZnO spindles prepared in advance. T...
Spindle-like Ag/ZnO heterostructure composites were synthesized through a solution-based surface modification method, during which Ag nanoparticles were deposited on the surfaces of ZnO spindles prepared in advance. The obtained samples were characterized by XRD, SEM, TEM, XPS, PL and UV–vis absorption spectroscopy. The photocatalytic activity of the as-prepared spindle-like Ag/ZnO samples with different Ag contents was tested with the photocatalytic degradation of methylene blue. Results showed that the photocatalytic activity of Ag/ZnO was obviously improved compared with the pure ZnO, and the Ag/ZnO-2 sample prepared with an AgNO 3 concentration of 0.05 M had the highest photocatalytic activity. The Ag/ZnO heterostructure composites promoted the separation of photo-induced electrons and holes, which was proved by surface photovoltage spectroscopy.
Co-precipitation compound precursors-hydrothermal processing was employed to synthesize Ni/Cu/A12OJZrO2 composite powder, and ZrO2-based composite ceramics was prepared. The technology recycled the metal of nickel, co...
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Co-precipitation compound precursors-hydrothermal processing was employed to synthesize Ni/Cu/A12OJZrO2 composite powder, and ZrO2-based composite ceramics was prepared. The technology recycled the metal of nickel, copper and aluminum from sludge, and the recovery rate of nickel was up to 95.5%. The property of ZrO2-based composite ceramics was improved because of the existence of nickel and copper particles. The fracture toughness of Ni/Cu/A12OJZrO2 composite ceramics was 8.52 MPa·m1/2 and the compressive strength was 51 MPa, showing the increase by 2.54 times and 1.5 times, respectively, compared with those of pure ZrO2 ceramics.
We have investigated the properties of organic light emitting diodes （OLEDs） with a nanopillar patterning structure at organic-metal or organic-organic interfaces. The results demonstrate that the introduction of a ...
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We have investigated the properties of organic light emitting diodes （OLEDs） with a nanopillar patterning structure at organic-metal or organic-organic interfaces. The results demonstrate that the introduction of a nanopillar structure can improve the light extraction efficiency greatly. We also find that the number, height, and position of nanopillars all affect the light extraction of OLEDs. The maximum power efficiency of a device with an optimized nanopillar patterning mode can be improved to 2.47 times that of the reference device. This enhancement in light extraction originates from the improved injected carriers, the broadened charge recombination zone, and the intensified wave guiding effects.
Indirect extrusion of Mg-10%Sn (mass fraction) alloys was performed at three different working temperatures. The effect of working temperature on the microstructure, texture and tensile properties of the extruded allo...
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Indirect extrusion of Mg-10%Sn (mass fraction) alloys was performed at three different working temperatures. The effect of working temperature on the microstructure, texture and tensile properties of the extruded alloys was investigated by optical microscope (OM), scanning electronic microscope (SEM), X-ray diffraction (XRD) and a standard universal testing machine. Grain size, area fraction of second phase particles and texture of the alloys are found to be significantly influenced by working temperature. The grain size refinement is greatly dependent on processing conditions with the low working temperature being the most effective. While the high working temperature results in a coarser grain size and a stronger fiber texture and the reason for this phenomenon was examined in terms of second phase particle, grain type and dynamic recrystallization mechanism. Tested in the different conditions, the tensile strengths of the Mg-10Sn alloys extruded at the high working temperature are remarkably better than those of the other studied alloys. This significant improvement in tensile properties is mainly due to the particle strengthening and texture strengthening resulted from the more and finer primary dispersed particles and stronger texture, respectively.
A Zr-based amorphous composite coating was fabricated by laser cladding and remelting on plain carbon steel. The amorphous phase contents of coatings were tailored by controlling the power density. The effect of amorp...
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Due to using （R）- or （S）-a-methylbenzylamine as a chiral auxiliary, and low-temperature regime for reduction of the intermediate ferrocenyl-mono- or 1,1＇-bis-ketimines, the corresponding secondary mono- or 1,1＇-...
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Due to using （R）- or （S）-a-methylbenzylamine as a chiral auxiliary, and low-temperature regime for reduction of the intermediate ferrocenyl-mono- or 1,1＇-bis-ketimines, the corresponding secondary mono- or 1,1＇-bis-amines were prepared with high diastereoselectivity. Removal of the a-methylbenzyl group afforded the optically active primary mono- and bis-ferrocenylethylamines in high yields. The absolute configuration of （R,R）-3a and （S,S）-3b was determined by X-ray single crystal diffraction.
The green light fluorescent powder of Tb-sulfosalicylic acid-undecylenic acid used in white light emitting diode (WLED) is synthesized. Infrared (IR) spectra show that the ligands have coordinated with Tb(III) ion suc...
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The green light fluorescent powder of Tb-sulfosalicylic acid-undecylenic acid used in white light emitting diode (WLED) is synthesized. Infrared (IR) spectra show that the ligands have coordinated with Tb(III) ion successfully. Ultraviolet (UV)-vis adsorption spectra demonstate that the absorption of complexes mainly comes from the ligands absorption. Flurescence spectra suggest that the complex emits characteristic green light at 543 nm excited by 365 nm UV light. And this characteristic indicates that the complex can be used as photoluminescent phosphors of UV chips potentially. Thermogravimetric analysis manifests that the decomposition temperature of the complex is near 200°C, meeting the requirement of working temperature of WLED well. The fluorescence lifetime of the complex is 1.413 ms and the quantum yield reaches up to 42%. Furthermore, the singlet and triplet energy levels of the ligands are calculated by quantum chemistry, and the luminous mechanism of the complex is explored.
Monodispersed ZnO microspheres were synthesized through ultrasonic irradiation using zinc acetate as a Zn source and triethanolamine as the structure-directing and alkalinity control agent. X-ray diffraction, scanning...
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