Advanced Materials Research Vols. 239-242

Abstract: In this paper, the WC and high-Cr Cast Iron layer were obtained on the surface of ZG30Cr steel by casting-penetrating process, the organization and wear properties of penetrating layer were studied. The results show that the layer is dense, without pores, slag and other defects, the penetrating layer and substrate are metallurgical bonding. When 20 %WC and 80 % Cr-Fe with are added to permeability agent, the penetrating layer has the best wear resistance, is 11.3 times the matrix materials.

Abstract: Lead-free potassium sodium niobate ceramic, with the nominal composition of K_0.5Na_0.5NbO₃, were synthesized by conventional solid state sintering, and its dielectric, ferroelectric, and piezoelectric properties were characterized as a function of sintering temperature. The orthorhombic to tetragonal phase transition (T_O-T) temperature of K_0.5Na_0.5NbO₃ ceramic sample was about 220°C, and its Curie temperature was about 420°C. The high bulk density was obtained for all compositions by solid state sintering in air. Bulk density was increased with temperature and it reached to 4.4 g/cm³. The K_0.5Na_0.5NbO₃ ceramic sample sintered at 1100°C was optimized densification properties. In addition, the ferroelectric loop and dielectric characteristics dependence of different sintering temperature for K_0.5Na_0.5NbO₃ ceramic sample was obtained. Finally, we found that the piezoelectric constant (d₃₃) was 160 pC/N, high remanent polarization (Pr) was 33mC/cm², and high electromechanical coupling coefficients (k_P) was about of 45%.

Abstract: Paralled flaw precipitation method has been employed to synthesize nanostructured Bi₂O₃. It is found that the bandgap and photocatalytic performance of Bi₂O₃ has a strong dependence on the kind of precipitants. The prepared photocatalysts were characterized by BET, XRD, UV-Vis diffuse reflectance and SEM. The results show that Bi₂O₃ prepared by NH₃·H₂O has the highest BET surface area, pore volume, the smallest pore size and the particle average size. Bi₂O₃ prepared by NH₃·H₂O exhibits the best photocatalytic activity. The results of further experiments show that bandgap and the specific surface area all play an important role in promotion of photocatalytic activity of Bi₂O₃ prepared by NH₃·H₂O.

Abstract: To improve the electrical and physical properties of as-deposited BSTZ thin films, the oxygen plasma treatment process were used by a low temperature treatment. In this study, the BSTZ thin films were post-treated under 150°C and 25 mTorr in the inductively coupled plasma. After oxygen plasma process treatment, the capacitance of thin films increased from 150 to 300pF in C-V curves, and the passivation of oxygen vacancy and defect in leakage current density curves were found. The influence of oxygen plasma on the chemical bonding state and crystalline structure was investigated by using XPS and XRD measurement.

Abstract: A D-π-D type of organic dye 2,7-di[4-(N,N-diphenylamino)styryl]-9-n-pentyl-9H- carbazole (DPSPC) with diphenylamine as donor group and styrene-carbazole-styrene as conjugation bridge has been synthesized. The photophysical properties of the dye in different solvents and poly methyl methacrylate/organic modified sol-gel glasses are researched. The results indicate that the fluorescence properties of the organic dye in composite glass increase relative to that in solvents and there are no fluorescence quenching in high doped concentration in composite glass matrixes. The dye has higher stability in the composite glass than that in solution.

Abstract: Composite electrode materials for supercapacitor were prepared by a combination of incipient wetness impregnation and hydrothermal method in this study. The materials were characterized by XRD, specific surface area and electrochemical testing. The effect of support on the electrochemical performance of the composite electrode materials was investigated. The result shows that the samples prepared by different supports contain nickel nitrate hydroxide hydrate (the electroactive material in the composite) and undecomposed nickel nitrate.The specific surface area decrease after the loading of nickel compounds, which indicates the exisitance of nickel compounds in the pores. The composite prepared by using diatomite support exhibits higher specific capacitance than those prepared by using SBA-15 and Ti-Si molecular sieve, which delivers the specific capacitance of 1162.77 F/g at the scan rate of 5 mV/s.

Abstract: The Ni-Cu-P coating fabric was obtained by electroless plating. The surface morphology, crystal structure, composition, surface resistance and electromagnetic interference (EMI) shielding effectiveness of Ni-Cu-P plated PET fabric were investigated. The result shown that under the same amount of plating, the EMI shielding performance of the copper plated fabric is better than that of the copper - nickel plated fabric which is better than that of nickel plated fabric. After copper tinted, the nickel plated fabric shows obviously imp roved in its shielding performance.

Abstract: In this article, the polyaniline(PANI) spherical nanoparticles were synthesized by the way of emulsion polymerization. The effects of emulsifier concentration on the morphology and electrical properties were systematic studied. The structure of PANI prepared by this method was characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM). The electrochemical and capacitive behavior of PANI prepared by this way was systematically studied by cyclic voltammetry(CV) and electrochemical impedance spectroscopy (EIS) tests. The results showed that we obtained PANI spherical nanoparticles with diameter about 100nm and it had good electrochemical performance.

Abstract: In order to improve the properties of boron-containing phenol-formaldehyde resin (BPFR), the tetrabromo-bisphenol A epoxy resin (TBBPAER) was used to cure BPFR. The curing mechanism, thermal properties and the fire resistance of TBBPAER/BPFR were investigated by fourier transform infrared spectrometer (FTIR), thermal gravimetric analysis (TGA), torsional braid analysis (TBA) and the oxygen index method. The results show, -OH of -C₆H₄-CH₂OH and -C₆H₄OH reacts with the epoxy group. With the increase in the amount of BPFR, the thermal properties get better. When the additive amount of TBBPAER is 10 wt%, this material has best thermal stability at high temperature and higher temperature of loss bromine. The glass transition temperature (T_g) is 223.2 °C and the LOI is 68.5.

Abstract: A series of ordered mesoporous carbon/cobalt oxide composites as electrode materials for supercapacitor were prepared via incipient wetness impregnation method. The results show that the structure and electrochemical properties of the composites depend mainly on the cobalt oxide loading amount in the ordered mesoporous carbon. The optimum loading amount of cobalt oxide is found to be 30 wt.%, and the composite derived from which exhibits 283.52 F/g of specific capacitance at the scan rate of 5 mV/s. The specific capacitances of which are higher than that of OMC and pure Co₃O₄ at every given scan rate, showing good synergetic effect.