ZnO nanoparticle-aggregated microspheres were synthesized through chemical bath deposition for aqueous solution containing Zn(CH3COO)2 and TEA. The as-prepared products were investigated by X-ray diffraction, scanning...
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ZnO nanoparticle-aggregated microspheres were synthesized through chemical bath deposition for aqueous solution containing Zn(CH3COO)2 and TEA. The as-prepared products were investigated by X-ray diffraction, scanning electron microscopy, thermo-gravimetric analysis and FT-IR absorption spectra. The effect of different TEA concentration on the morphologies of ZnO was also studied. The results suggest that some monodisperse flower-like Zn5(OH)8Ac2·2H2O are obtained from the aggregation of small lamellas at early stages. As the aging time increases, Zn5(OH)8Ac2·2H2O decomposs into ZnO nanoparticles and simultaneously, ZnO nanoparticles assemble into a microspheres until the Zn5(OH)8Ac2·2H2O completely disappears.
We present a simple efficient green phosphorescent device based on the direct charge-recombination mechanism in heavy doping Ir(ppy)3. The 4, 4', 4″-Tris(carbazol-9-yl)triphenylamine (TCTA) and bis (4, 6-difluoro...
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We present a simple efficient green phosphorescent device based on the direct charge-recombination mechanism in heavy doping Ir(ppy)3. The 4, 4', 4″-Tris(carbazol-9-yl)triphenylamine (TCTA) and bis (4, 6-difluorophenyl-pyridine)(picolinate) iridium(III) (FIrpic) are selected as doping materials that doped into emitting layer respectively. The maximum current efficiency values of 43.1 cd/A and 51 cd/A are demonstrated in these devices, which increased by 50% and 79%, respectively. The results reveal a practical way to fabricate highly efficient bilayer organic devices.
In this paper, the effects of Cr on segregation of S or Cl atoms at the α-Fe SΣ5(210) grain boundary (GB) are studied using a first principles method, CASTEP. In the absence of Cr, S can be trapped at the interstiti...
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This paper introduced the characteristics of honeycomb structure assembly technology and reviewed the status and evolution of research activity from 2001 to 2014 based on the Web of science database. Recently, laser w...
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This paper introduced the characteristics of honeycomb structure assembly technology and reviewed the status and evolution of research activity from 2001 to 2014 based on the Web of science database. Recently, laser welding and FSW have become effective methods for joining those metals with poor weldability and for joining honeycomb structures with different thickness or dissimilar materials. It was pointed out that honeycomb structure assembly technology processes including the friction stir welding and hybrid Laser-MIG, due to their advantages of high efficiency, would have great application potentials and flexibility in the special-structure welding in the fields of automobile, airplane, electronic, and chemistry industry.
Surface molecularly imprinted polymers(SMIPs)on carbon microspheres(CMSs)with template sulfur-containing compounds such as dibenzothiophene(DBT)and benzothiophene are one kind of advanced nano-composite materials whic...
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Surface molecularly imprinted polymers(SMIPs)on carbon microspheres(CMSs)with template sulfur-containing compounds such as dibenzothiophene(DBT)and benzothiophene are one kind of advanced nano-composite materials which can be effectively used in distinctive adsorption and nondestructive removal of target
Density functional theory was employed to investigate the structure and properties of Ni/Cr2O3 and Ni/Al2O3/*** O-terminated Ni(1 11)/Cr2O3(0001) interface was firstly found to be the most stable *** on this construct...
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Density functional theory was employed to investigate the structure and properties of Ni/Cr2O3 and Ni/Al2O3/*** O-terminated Ni(1 11)/Cr2O3(0001) interface was firstly found to be the most stable *** on this construction, the effects of the Al diffusion at the Ni/Cr2O3 interface were further *** results of total energies indicate that Al atoms originating from Ni slab prefer to diffuse into Cr2O3 slab through the interface, resulting in the formation of alumina at the Ni/Cr2O3 *** to the presence of Al atoms, there was an amazing increase in the work of adhesion, whereas the Ni/Al2O3/Cr2O3 interface showed the strongest ***, this calculated work well agrees with the reported experimental results.
The paper designed and synthesized a wide band-gap pyridone derivatives 3, 5-dimenthyl-6-nitrile-pyridone(DNPE).The chemical structure of the complex was confirmed by FT-IR spectra, 1H NMR and elemental analysis techn...
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The paper designed and synthesized a wide band-gap pyridone derivatives 3, 5-dimenthyl-6-nitrile-pyridone(DNPE).The chemical structure of the complex was confirmed by FT-IR spectra, 1H NMR and elemental analysis techniques, and its crystal structures were also determined. DNPE was triclinic crystal system, P-1 space group, a=0.39049 nm, b=0.73288 nm, c=1.2694 nm;α=77.09°, β=89.16°, γ=89.40°. Optical band gap and photoluminescence were investigated by UV-Vis absorption spectra, cyclic voltammetry experiments and fluorescence emission spectrum. The results showed that its UV-Vis absorption peak in alcohol solution were at about 215, 237, 330 nm, maximum emission peak was at 395 nm in solid state and was at 375 nm in liquid state, which showed DNPE had obvious solution effects. Fluorescence quantum efficiency of 3, 5-dimethyl-6-nitrile-pyridone was calculated by the value of 66.54%, which showed that pyridone derivatives had great application values both in fluorescent light-emitting materials and in blue-light emitting host materials.
To improve the comprehensive mechanical properties of Mg-15AI magnesium alloy, different amounts （from 0 to 4.0wt.%） of Nd were added to the alloy and six Mg-15AI-xNd alloys were prepared by metal mould casting. The...
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To improve the comprehensive mechanical properties of Mg-15AI magnesium alloy, different amounts （from 0 to 4.0wt.%） of Nd were added to the alloy and six Mg-15AI-xNd alloys were prepared by metal mould casting. The effect of Nd content on microstructure of the alloys was investigated by means of OM, SEM, EDS, TEM, and XRD. The tensile properties were tested at room temperature （RT） and high temperature （473 K）. The results indicate that the primary a-Mg dendrite is significantly refined with the addition of Nd. The best refinement is reached at 1.0wt.% Nd content and the average dendrite arm spacing decreases from 80- 100 pm （without Nd addition） to -20 pm. A further increase in Nd content leads to the coarsening of the primary a-Mg dendrite. The addition of Nd improves the tensile properties of Mg-15AI both at RT and 473 K. The Mg-15AI alloy containing 1.0wt.% Nd exhibits the best tensile properties. Compared with the alloy without Nd, the yield and ultimate tensile strength of the Mg-15AI-1.0Nd alloy at RT increase from 132.3 to 148.6 MPa and 152.3 to 189.6 MPa, increase by 12.3% and 24.5%, respectively; and the elongation at RT increases from 0.05 % to 1.24%. The yield and tensile strength of the alloy at 473 K increase from 97.9 to 115.3 MPa and 121.6 to 140.1 MPa, increase by 15.2% and 20%, respectively. Further increment of Nd content to 1.5wt.% degrades the tensile properties, which is ascribed to grain coarsening and growth of the AI-Nd phase.
By solution and aging treatment (T6) at 410°C/16 h/AC+170°C/24 h/AC, the precipitation phase of Mg-9Al-Zn-0.16La alloy was observed, and the average corrosion rate in 3.5% NaCl solution for 0-168 h was teste...
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By solution and aging treatment (T6) at 410°C/16 h/AC+170°C/24 h/AC, the precipitation phase of Mg-9Al-Zn-0.16La alloy was observed, and the average corrosion rate in 3.5% NaCl solution for 0-168 h was tested. The results show that after T6 treatment, the β phase precipitation mode is different, the discontinued β phase is transformed into layered structure during solution and aging treatment. in the mean while, the corrosion resistance of tested alloy in 3.5% NaCl solution is reduced from 6.3 mg·cm-2·d-1 of as-cast to 4.5 mg·cm-2·d-1 of T6 treatment.
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