Advanced Materials Research Vols. 287-290

Abstract: Compared to the common hot runner molding,the valve gate control sequential molding has the advantages in the control of (injection and packing)pressure and weld lines,etc.the method is very suitable for large sized thin wall parts. In this paper,the door-panel of a washing machine was taken for an example, the simulation of the both process above mentioned were carried out by computer-aided engineering. According to the results of the study,the main achievements are as follows:Although the equipment cost of the valve gate control sequential molding was increased,the part quality (especially the quantity of weld 1ines and air traps) is improved greatly,at the same time,the clamping force of the injection machine are dropped.

Abstract: Melt Phase-splitting[1] method was a new one of preparing supported nano-photocatalytic materials.The nano TiO₂ prepared loaded to the porous glass carrier. In this study,the technology of preparing nano TiO₂ by melt phase-splitting method was Optimization, also doing doping modifcation on them. Using nano TiO₂ photocatalyst to do photocatalytic degradation test on formaldehyde.The result had shown that: the degradation efficiency of the catalyst containing ZnO was higher than that free of ZnO. The rate of degradation of formaldehyde of the catalyst free of ZnO could reached 58.7% in 8 hours, but that of the catalyst containing was only 53.3%. Using fluorescent lamps as the light source,the photocatalytic efficiency of the catalyst free of ZnO could reached 43.2%.

Abstract: Nozzle-flapper type electro-hydraulic servo valve operated by torque motor has been widely used in industrial applications. As their bandwidths are limited, they are not suitable for high-speed applications. This paper presents a novel nozzle flapper valve driven by the giant magnetostrictive actuator, which has been designed and integrated into the four-nozzle flapper valve to replace the torque motor. And the influence of involved structural parameters on the dynamics of the actuator and the nozzle flapper valve is analyzed by AMESim. The simulation results can provide an important reference and basis for the optimization and design of the four-nozzle flapper valve.

Abstract: The surface modification of the tourmaline powder with lauroyl chloride was studied in this paper, and discussed the influence of reaction conditions on modified effect with parameters of activation index and contact angle. Results showed that the activation index of modified tourmaline powder reached to 96% while tourmaline powder reacted with equiponderant lauroyl chloride at 80 °C in DMF for 5 hours, and the modified tourmaline had excellent hydrophobic property. Structural analysis revealed that hydrophobic alkyl was attached to the surface of tourmaline powder, but it had no effect on the crystal configuration of tourmaline powder.

Abstract: The environmental protection water-based grafted whole propyl epoxy resin latex(AOW-201) as a basic raw material of the interface penetrant, waterproof pressure and anti-cracking putty, and anti-corrosion coatings and water-based with rust anti-corrosion paint,that are used for reinforced concrete members repair works.Therefore,that is a type of reinforced concrete structures worthy of restoration works to promote the application of new anti-corrosion chemical materials.

Abstract: Superhydrophobic film was fabricated mainly by ethyl silicate (TEOS) and ethanol (EtOH) using sol-gel method. SiO₂ gel and samples coated with SiO₂ sol were calcined at different temperatures, and their morphology and composition were studied using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results indicate that increasing calcining temperature appropriately improved the bond of nanoparticles of film successfully. Furthermore, there were only amorphous SiO₂ and hydroxyl existing in the calcined film which would be benefit for the further modification.

Abstract: Nanocrystalline bismuth titanate materials were synthesized via hot injection method for the first time. Bismuth nitrate and titanium butoxide were used as precursors of Bi and Ti, respectively. The synthesis method was modified to use aqueous solution as the solvent instead of non coordinating solvent which enable production of nanosized compounds at lower reaction temperature. During the synthesis process, titanium precursor was injected into mixture of bismuth nitrate and oleic acid at 130°C, leading to a rapid burst nucleation and followed by nuclei growth at room temperature. The synthesized compound was heated at various temperatures. XRD results showed formation of cubic phase bismuth titanate compound with space group of Fm3m at room temperature after the reaction. Presence of cubic phase bismuth titanate compound with space group of I23 was observed as secondary phase at 300°C. Meanwhile, a single phase cubic form, space group I23 was obtained for material synthesized at 600°C. FESEM images indicated nano particles of bismuth titanate materials were produced at lower temperatures. However, sintering effect was observed in material heated at 600°C, resulting micro-sized particles.

Abstract: Applied mechanical stress has a strong influence on magnetic properties of material. The aim of this paper is to discuss key technology of establishing an experimental platform for measuring magnetic properties of electrical sheet under tensile stress. Finally, measurement result of stress dependence of the magnetic characteristic under different applied stress is presented. Some conclusions about the stress-dependent magnetic behavior is also given in this paper.

Abstract: To obtain an ultralow surface reflectance and reach broadband antireflection effects,in this paper, silicon nanowires (SiNWs) layer has been fabricated by low-cost and easy-made silver-assisted etching techniques.The morphologies, reflectance and surface recombination of the samples were separately characterized. The ultralow reflectance below 3% from 300 to 800 nm under normal incidence has been realized in the case of ~ 1 μm long SiNWs whose geometry structures approximate to multi-layer gratings stack and the refractive index gradually increases from the top to the bottom of substrate. However, surface recombination of SiNWs deteriorates due to numerous dangling bonds and residual silver. Therefore, a trade-off between antireflection effect and recombination loss is the key to the electronic device.

Abstract: A mide, simple and efficient synthetic procedure for the preparation of 2,7-dibromo-2′,3′,6′,7′-tetra(2-methylbutyloxy)spirobifluorene and key intermediates, tetra(2-methlbutyloxy)biphenyl ，2-bromo-4,5,3′,4′-tetra(2-methylbutyloxy)biphenyl, 2,7-Dibromo-2′,6,3′,7′--tetra(2-methylbutyloxy)biphenyl-9-Fluorenol, has been developed. The procedure described herein offers several advantages, including high product yields, easy purification, and large scale production. Ether protected 2,7-dibromo-9,9′-spirobifluorene has good solubility in organic aolvents to permit an appropriate coating process, ability to achieve various colors so as to make full color display elements possible.