Advanced Materials Research Vol. 531

Abstract: A series of Cr1-xAlxN coatings were deposited by reactive magnetron sputtering. The content, microstructure and the hardness of the thin films were characterized respectively with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and nanoindentor. The effect of Al content on the microstructure and hardness was studied. It was found that Cr1-xAlxN compound coating exhibits a cubic structure with (1 1 1) preferred orientations and that the lattice parameter of Cr1-xAlxN coatings decrease with the increase of Al content. The hardness of Cr1-xAlxN compound coating is higher than that of CrN and increases with the increase of Al content.

Abstract: In order to study the application of fluidized bed process for the gas quenching steel slag(GQSS) slag-iron separation, according to the principles of fluidized bed material separation, based on the all GQSS, this paper researches the influence law of fluidization characteristics and the fluidization performance of GQSS after adding 20% (calculated by volume) iron grains. The experiment uses single hood fluidized bed as experiment device, studies the GQSS and iron grains of critical fluidization and slugging fluidization of other characteristics in the fluidization process, and determinates the packing density in interior and exterior of the tube. The results show that: when the material is all GQSS, the appropriate fluidization thickness of material layer is 300~400mm ; after adding 20% iron grains in the tube, the appropriate fluidization thickness of material layer is 350~400mm. The results of this paper on GQSS slag-iron separation have important theoretical significance.

Abstract: Nano-TiO2 is a high efficient and no poisonous light induced catalyst. It is important how to immobilize it on some supporter for its application. In this paper, The Nylon-6 (PA-6) nanofibres bearing TiO2 nano-particles were prepared via gas-jet/electrospinning technique. The resulted materials were characterized by XRD, SEM, TEM, EDX and TG techniques, and antibacterial activities of the resulted fibers were tested by Shake Flask method. The results show that fibers bearing nano-TiO2, in an average diameter from 60 to 65nm were prepared, and the antibacterial efficiency of these gas-jet/electrospun nanofibers can reach 99.74%. The titled fibers can be loaded in a sandwich structure nanofiber super-cleaning material by hot-press process, and its filtration efficiency can reach 99.50% with 1µm polystyrene microspheres as the filter media.

Abstract: Ferromagnetic base composite materials were applied widely in aircraft and space vehicles engineering. Aimed to an advanced ferromagnetic base composite material, a series of experiments for thermal physical properties of this material were conducted, and the corresponding performance curves were obtained through statistic analyzing. The experimental results showed good consistency. And then the thermal physical parameters such as thermal expansion coefficient, engineering specific heat and sublimation heat were solved and calculated. This investigation provides an important foundation for the further research on the heat resistance and thermodynamic performance of this material.

Abstract: A series of Cr1-xAlxN coatings were deposited by reactive magnetron sputtering. The content, microstructure and surface morphology of the coatings were characterized by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of Al content on the microstructure, and the oxidation resistance and hardness was studied. It was found that Cr1-xAlxN compound coating exhibits a cubic structure with (1 1 1) preferred orientations. The oxidation resistance obviously improves with the increase of Al content.

Abstract: Highly conductive and transparent TiO2 nano films have been deposited by R.F. magnetron sputtering method on glass substrates. The influence of argon gas pressure on deposition rate, electrical performance and surface morphology has been studied through the ellipsometric thickness gauge, scanning electron microscopy and energy disperse spectroscopy. The results show that, with the rise of argon gas pressure, the deposition rate reduces, resistivity decreases, roughness increases. When Ar pressure is 3.0Pa, the resistivity reached 3.3×105Ω•cm, sputtering pressure is lower, the surface atomic diffusion capacity is stronger, the film is more dence.

Abstract: InP nanocrystals were prepared by an economic chemical reaction. A very high density of surface states is found at 0.5 eV below the intrinsic conductive band edge. Mixing these InP nanocrystals with MEH-PPV, obtained the composite. Devices with structure ITO/composite(MEH-PPV)/Al were fabricated and investigated. Photocurrent spectra showed that the interface between a conjugated polymer and a semiconductor nanocrystal can be used to provide efficient charge separation for neutral excitons on both the ground states and excited ones. Incorporation of nanocrystals, the conductivity of diode shows large improvements.

Abstract: Ternary composites of Ag–loaded polypyrrole/carbon nanotube (Ag–PPy/CNT) are prepared using a one–step in situ polymerization. Ag nanoparticles are uniformly decorated on the core–shell PPy/CNT networks. This approach provides a simple, easily accessible strategy for preparing three–dimensional noble metal–conductive polymer–carbon nanotube composites. Electrochemical properties of Ag–loaded composites are evaluated to understand the effect of Ag on the structure and kinetic process of the composite. Results indicate that the composites have good electrochemical reversibility and high specific capacitance. The specific capacitiance of Ag–PPy/CNT composites are enhanced greatly from 206.7 F g–1 of PPy/CNT composites to 528.6 F g–1 at 3 mA cm–2. This demonstrates that combining nano–sized Ag with supercapacitor materials is very effective in promoting electrochemical performance of materials.

Abstract: By using the chitosan and sodium alginate as raw material, (NH4)2Ce(NO3)6 as the initiator, under alkalinity condition, chitosan / sodium alginate copolymer was synthesized. Chemical structure of CTS-AGS was characterized by FT-IR, and the morphology of CTS-AGS was observed by SEM. The results showed the synthesis of CTS-AGS was carried out as the established way. The addition of AGS greatly reduced the hydrogen bonds and increased steric resistance among chitosan molecules, and hence made CTS-AGS had stronger affinity for water. The optimal conditions for the synthesis were: m(CTS)∶m(SAL) =2:1, reaction temp. is 70°C, and the best time is 24h.