Advanced Materials Research Vols. 430-432

Abstract: In order to research the influenced factors of sensitivity of ultrasonic nondestructive testing, the compared experiments using water immersion and contact method were carried out and the experimental results of sensitivities were obtained. The results showed that the limited sensitivities of probes with 1MHz and 2.25 MHz is very low. And the defects ofφ1mm, which distance not exceeding 1mm, can be detected by probes of 5 MHz and 10 MHz. The defects ofφ0.5mm can be detected by probes of 15 MHz and 20 MHz. The definition of defects apperance will be further improved for the probes with their frequency more than 15 MHz when the scanning step enough small. The distance of probes and defects has little effect on the detecting sensitivity.

Abstract: ZnO nanowire array supported on the graphene surface was fabricated by thermo hydrolysis method. The ZnO nanoparticles (seed crystals) were first deposited on GO surface and then ZnO nanoparticles grew to ZnO nanowire array when the seed crystal side was hung upside down and touched with ZnO precursor solution during the process of thermo hydrolysis. The ZnO nanowire array was then coated with TiO₂ precursor, hydrolyzed and turned to crystalline TiO₂. The formed ZnO/TiO₂/graphene composites have different structure depending on the reaction conditions and their morphology was observed with scanning electron microscopy.

Abstract: Though poly(ethyleneteraphthalate)(PET) fabrics have high initial modulus, outstanding creasability and wash-well character, but its hydrophilicity and biocompatibility are very poor. In this paper, the PET fabric was encased sucrose ester at high pressure and high temperature to endue it enough hydroxyl to grafting protein. The sericin was grafted on PET fabric by sucrose eater glycidyl ether (SEGE). The FT-IR spectra showed that sericin was grafted on PET fabric, and the structure of sericin was random coil conformation. X-ray diffraction spectra showed the structure of PET fiber did not changed. DSC showed the thermostability increased a little. After the PET fabric grafted with sericin, the hydrophilicity of PET sericin composite fabric was improved greatly, the cockle elasticity kept well, and the broken strength in creased a little. Certainly, the whiteness and air permeability decreased a little. The PET sericin composite fabric was high functional.

Abstract: Liquid shock absorbing system as the primary one, although it can solve the shock absorbing problem, there has been a crash or impact occurs instantaneously when the apparent tilt steering and comfort very poor phenomenon. To this end, a new study of nitrogen gas shock absorber fluid control body height at rated load automatically within the body to adjust to the optimal height designed to improve the car's shock absorber damping effect, making the car more shock absorption system safe and comfortable, with a more stable operational.

Abstract: The kinetics and activation energy of photocatalytic degradation of phenol has been studied using the catalytically active TiO2 and PANI modified TiO2 nanoparticles. The reaction follows a pseudo-zero-order kinetics. Apparent activation energy of phenol photocatalytic degradation in water was 13.76kJ/mol by TiO2 and was 12.31kJ/mol by TiO2/PANI.

Abstract: The effects of SiC addition on physical properties and slag resistance of MgO-based castables were investigated using magnesia as the main raw and silica micropowder as binder. The result revealed that with increasing SiC addition, dried strength decreased, medium and high temperature strength first increased and then decreased and reached a maximum at 3% SiC addition. The hot modulus of rupture (HMOR) of the materials maximized at 3% SiC addition. The slag penetration resistance of the castables was improved while resistance to slag attack was deteriorated with the increase in SiC addition. The materials exhibited optimum slag resistance at 3% SiC additions.

Abstract: The high-pressure crystallized bisphenol-A polycarbonate (BAPC) and BAPC / dioctyl phthalate (DOP) blend samples were prepared in a piston-cylinder apparatus, and the recovered specimens were investigated using scanning electron microscopy (SEM). As for the fracture surfaces without etching technique applied, the detailed information of the crystal morphologies of BAPC was not shown, though the outlines of such aggregations as spherulites and cylindrulite were still exposed due to the high-temperature degradation during the long time crystallization. However, the delicate internal structures of these aggregates were revealed clearly by the introduction of a facile etching method. The used etchant, dimethylacetamide, was capable of dissolving only amorphous, but not crystalline BAPC at room temperature. With the employed selective etching technique, BAPC spherulites with fine structures and different characteristics were observed. Spatial dendrites of the polymer were also disclosed in BAPC samples plasticized with DOP after a deep etching process. Furthermore, by controlling the etching process, unique hierarchical structures, composed of nano-structured micrometer-sized crystalline entities of BAPC, was created on the fracture surfaces. The study presented here suggested that selective etching is a more effective route to reveal the inner structures of polymer crystals, as well as to fabricate new surface active materials, such as a super-hydrophobic surface with self-cleaning effect.

Abstract: Spinel-type metal oxides, lithium-titanium oxide(LiTi1.25O3), was prepared by a solid state reaction crystallization method. The extraction/insertion reaction with this material was investigation by X-ray, saturation capacity of exchange, and Kd measurement. The experimental results have proved that the acid-treated sample has a capacity of exchange 5.9 mmol•g-1 for Li+ in the solution.

Abstract: The deformation of vibration incremental forming process for sheet metal is in high complexity, theory research is not perfect. This subject using DEFORM simulation software, joined the vibration on the forming process of tool head and simulated the forming process base on different tool radius and vibration parameters. Simulation result indicated that vibration in greatly reduced the stress of the forming tool head. The right vibration parameters smoothed out the forming force largely, reduced sheet metal stress concentration, improved product quality and product yield. That has a higher degree of study and use value.

Abstract: Ultra thin graphene oxide (GO)/polyvinyl alcohol and graphene-polyvinyl alcohol/gelatin composite films were fabricated by electrostatic layer-by-layer assembly and spinning coating methods. The assembling and coating process were traced with UV-visible absorption spectroscopy and the morphology of the formed ultra thin films was observed under scanning electron microscopy. The results show that the adsorption value of the GO based composite films linearly increased as the number of layers increased. The ultra thin graphene oxide/polyvinyl alcohol and graphene-polyvinyl alcohol/gelatin composite films have layered structure with high tensile strength because of the incorporation of GO. These strong ultra thin films have potential applications in coating, sensor and electrochemical devices.