Advanced Materials Research Vols. 239-242

Abstract: We present a probe of scanning near-field optical microscope (SNOM) with large aperture and high resolution, which is added a metallic dipole nano-antenna onto the tip of the ordinary probe. Based on the FDTD algorithm we investigate numerically the measure results by different aperture probes for the same sample with the incident wavelength of 830nm and the scan height of 10nm. The results show that the resolution of the new probe is 100nm, 75nm, 50 nm, 45 nm, 50 nm, 70nm when the probe aperture is 50nm, 100nm, 130nm, 150nm, 170nm, 200nm respectively, and for the ordinary probe the resolution is 50nm，120 nm,140 nm,180 nm, 200nm, 220nm correspondingly. That is to say the resolution of the ordinary probe decrease rapidly with the increasing of the aperture, however the novel probe can maintain the high resolution.

Abstract: The blueprint for an intelligent control system of cap-shape bending has been advanced in this paper using neural network technology, aiming at an accurate control of bending springback, the prominent problem during the forming process for the cap-shape bending of sheet metal. The feed-forward neural network of real-time identification for material performance parameters and the friction coefficient have been established. The neural network identifies the parameters for real-time needed material performance, which utilizes the measurability of the physical quantities, and predicts the parameters for optimum technology, so a satisfied accuracy of convergence has been achieved. The intelligent control experimentation system of cap-shape bending has been established, the validity of which has been tested for four kinds of materials. The result of the tests proves the feasibility of the blueprint of the intelligent control system.

Abstract: The goal of this work has been the synthesis of novel fluorine-containing glycidyl ether based on 3, 3, 2, 2-tetrafluoropropanol (TFP) and epichlorohydrin (ECH) as the starting materials under condition of TBAB (Tetrabutylammonium bromide) catalyst. Furthermore, a novel fluorinated polyether glycol was successfully produced by the above synthesized fluorine-containing glycidyl ether. The structure of the products was characterized by 1H-NMR and IR spectrum. The number average molecular weight was measured by GPC.

Abstract: TiO₂/La₂Zr₂O7 composites were fabricated by sol-gel method. The composites were characterized by X-ray powder diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS) and Brunauer-Emmett-Teller (BET) nitrogen adsorption. The results showed that TiO₂ was uniformly coated on the surface of La₂Zr₂O₇ powders. The BET surface area of TiO₂/La₂Zr₂O₇ composites was 26.78 m²/g, which was larger than that of La₂Zr₂O₇. Also, the photodegradation of methyl orange was used to evaluate its photocatalytic property. It was found that TiO₂/La₂Zr₂O7 composites showed good photocatalytic activity and the decomposition of methyl orange had basically completed within 30 min.

Abstract: Two different dendritic 8-hydroxyquinoline ligands were synthesized through convergent approach, and the products were characterized by nuclear magnetic resonance (NMR) and infrared spectrometry (IR); the fluorescence properties of the dendritic 8-hydroxyquinoline ligands and the corresponding metallic complexes with Zn (II) were also studied by fluorescent spectrometry. The results show that the dendritic modifications of 8-hydroxyquinoline nucleus enhanced the intensity of luminescence, and the peripheral functional groups in the dendritic structure may affect the property of luminescence; the obvious red shift observed in the fluorescence profile of dendritic 8-hydroxyquinoline zinc provides it prospect of extensive application in the discipline of organic electroluminescent materials.

Abstract: Ni-graphite composites were prepared using co-electrodeposited technique in sulfamate bath. To obtain an optimum combination of nickel and graphite in the composites with excellent performance such as wear resistance, corrosion resistance and microhardness and so on, effects of complex agents on the performances of composites were investigated in this work. The obtained Ni-graphite coatings were characterized by means of SEM, EDS and the microhardness measurement, it was revealed that Ni-graphite coating exhibit fine-grained structure with uniform surface and high microhardness values, although some pores and defects were still present in the coating. In addition, the co-electrodeposited Ni-12.16vol% graphite coatings showed considerably better performance, analysis of Tafel curves demonstrated that corrosion resistance of the coating prepared from bath containing complex agents were better than those prepared from bath without complex agents in the NaCl and HCl solution, but worse in the NaOH solution.

Abstract: The production of high purity steel is a major task for the iron and steel enterprises in the 21^st century. To improve the quality of steel products and produce the cleanness steel, the key technique is to control inclusions in the molten steel. In the present investigation, a novel fine inclusion removal technology due to the dispersed in-situ phase induced by the composite ball explosion reaction was put forward. A composite ball with this function has been designed and the industrial experimental investigation was also carried out. The results indicate that feeding composite ball in RH ladle is a novel technology and the inclusion in the molten steel can be removed effectively. Compared with conventional inclusion removal technology, the number of the oxide inclusion can be decreased to a lower level and the inclusion size becomes much finer. Using this novel technology, the total oxygen in the as-cast slab can approach to 6ppm. This novel technology can be achieved without special facility and be realized in most steelmaking plant.

Abstract: Boron-containing bisphenol-S formaldehyde resin (BBPSFR) was synthesized by formalin method. The structure and thermal properties of BBPSFR were characterized by ¹H NMR, FTIR, torsional braid analysis (TBA) and thermogravimetric analysis (TGA), respectively. The results showed that the borate had formed, and the six-member ring containing boron-oxygen coordinate structure also formed during the curing process. The glass transition temperature (T_g) of BBPSFR is higher 104°C than that of bisphenol-S formaldehyde resins (BPSFR); the initial degradation temperature (T_i ) increases about 43°C; thermal degradation rate decrease and thermal stability increase significantly.

Abstract: This text used by hot-pressing diffusion welding to obtain Ti-Al laminated composite anode.The interfacial morphology and interface reaction of Ti-Al laminated composite anode were analyzed by means of scanning electron microscopy(SEM) and EDS. The Ti/IrO₂-Ta₂O₅ were got by typical oxygen evolution model coating ingredient(mole ratio of Ir to Ta was 7:3) and the sides of Titanium were examined by using electrochemical workstation.This text results indicated that the interfacial thickness varied from 462nm to 792nm with the increase of holding time and increased from 396nm to 1.25µm with temperature rising. Under the same condition of hot-pressing diffusion welding,the thickness of diffusion interface layer with aluminum sheets by previous cold rolling (1.25µm) is thicker than non-cold rolling(924nm),increasing by 35.28%. Ti-Al laminated composite anodes by using hot-pressing diffusion welding showed better performances than the industrial titanium.The oxygen evolution anode showed the best performance by holding at 833 K for 2h under the pressure of 6MPa.This will play a role in the energy saving.

Abstract: P-type semiconductor SrCu₂O₂ was synthetized by semi-wet method. The precursor was analyzed by TGA and the calcined samples SrCu₂O₂ were characterized using XRD and SEM. N-P heterogeneous complex CdO/SrCu₂O₂ and WO₃/SrCu₂O₂ were prepared using equal volume impregnation method. The photocatalylic activity of SrCu₂O₂, CdO/SrCu₂O₂, WO₃/SrCu₂O₂, CdO and WO₃ under ultraviolet light irradiation was investigated. The experimental results showed that SrCu₂O₂, CdO and WO₃ did not exhibit any activity when they were used alone, but CdO/SrCu₂O₂ and WO₃/SrCu₂O₂ were efficient photocatalysts for water decomposition to hydrogen. The conclusion could be drawn that the combination of N-type semiconductor and P-type semiconductor is very important for the photocatalysis.