Abstract: Epoxy resin was filled with glass powder to optimize the strength and of the composite for structural applications by a research centre in the University of Southern Queensland (USQ). In order to reduce costs, the centre wishes to fill as much glass microspheres as possible subject to maintaining sufficient strength and fracture toughness of the composites in structural applications. This project varies the percentage by weight of the glass powder in the composites. After casting the composites to the moulds, they were cured at ambient conditions for 24 hours. They were then post-cured in a conventional oven and subjected to tensile tests. It was found that the best percentage of glass powder by weight that can be added to the epoxy resin to give an optimum yield and tensile strengths as well as Young modulus and cost was five percent. It was also found that the fractured surfaces examined under scanning electron microscope were correlated with the fracture toughness. The contribution of the study was that if tensile properties were the most important factors to be considered in the applications of the composites, glass powder is not a suitable filler. It is also hoped that the discussion and results in this work would not only contribute towards the development of glass powder reinforced epoxy composites with better material properties, but also useful for the investigations of tensile properties in other composites.
Abstract: The ammonia phosphate treated HZSM-5 zeolite was used as support for TiO2 prepared by sol-gel method. Adsorption and photocatalytic activity of the zeolite, adsorption of the loaded TiO2, and the optimum TiO2 loading percentage were studied. The zeolite can concentrate methyl orange solution after adsorbing water and possesses no obvious photocatalytic activity. The solution reached its adsorption equilibrium after 20 min when using TiO2 loaded on HZSM-5. In the TiO2 loading range from 10% to 70%, the dye decoloration rate increased constantly from 20% to 36.2%. The activity of the TiO2 was enhanced after loading with the optimum loading percent of 70%. During the whole 180 min of irradiation, TiO2/HZSM-5 showed enhanced methyl orange decoloration activity.
Abstract: This study aimed to use mixed media as paint, through case study with interactive discussion teaching method between the teacher and the students, to plan for and design a storyboard as the script. Current papers used for painting and characteristics of mixed media paint were introduced to the students to help them choose papers and mixed media according to their own specialties, so that they could come up with a picture book with richer and more delicate content. Furthermore, documentary analysis was conducted with current documents related to picture book creation in order to provide students references for their creation. Finally, the students were guided to use computer graphing software to edit the scanned hand-drawings and perform typesetting. Eventually, the art creation of a picture book with both hand-drawing and computer graphing was completed.
Abstract: While mica papers are used as insulation material binders and reinforcement materials are needed to enhance the mechanical strength which might reduce insulation property of mica paper materials. In this paper aramid fibers and mica flakes are mixed to make composite paper insulation, both have the high strength, heat resistance of aramid fibers and high dielectric strength, corona resistance of mica flakes. When this composite material is preparing, process of mix pulp papermaking was chosen, combined with mica flake and aramid fiber modification. Prepared composite material has properties of high tensile strength, dielectric strength, heat resistance, softness, can be used as high quality insulation.
Abstract: The behavior of the ammonia (NH3) oxidation was by selective catalytic oxidation (SCO) over a honeycomb supported Pt-Pd-Rh composite catalyst in a tubular fixed-bed flow quartz reactor (TFBR) at 673 K. A honeycomb Pt-Pd-Rh composite catalyst was prepared by incipient wetness impregnation with aqueous solutions of H2PtCl6, Pd(NO3)3 and Rh(NO3)3 that were coated on cordierite cellular ceramic materials. The catalysts surface properties were characterized using OM. The experimental results show that contaminants crystal aggregation phases and washcoat loss from high initial concentration of NH3 may be responsible for the deactivation of the catalysts. In addition, the catalytic redox behavior was determined by cyclic voltammetric (CV), which showed that the catalytic behavior is related to the metal oxide properties of the catalyst.
Abstract: The mechanical and thermal properties of hollow glass powder reinforced epoxy resin composites have been measured and evaluated in earlier studies. This basic but critical and important data have caused interests in the relevant industry in Australia. This study is therefore carried out to measure and evaluate the dielectric properties of the composites with a view to benefit the relevant industry. The relationship between the dielectric and thermal properties will also be studied and correlated. The original contributions of this paper are that samples post-cured in conventional ovens have higher electrical as well as mechanical loss tangent values than their counterparts cured in microwaves only. The storage modulus of all samples post-cured conventionally is higher than its counterpart. This is in line with the fact that they are softer material with lower glass transition temperatures. For all percentages by weight of glass powder, the glass transition temperature for the microwave cured sample was higher and the composite was stiffer; the opposite was true for the conventionally cured samples.
Abstract: This paper presents the development process of a fully-coupled multiphysics finite-element model of electromagnetic tube compression, using the commercial software Comsol Multiphysics. The presence of a field concentrator inside the solenoid coil is numerically modelled. First, the results of free compression of a S235 steel tube are presented. Next, the joining process of a S235 steel tube with an internal workpiece of the same material is considered by inclusion of a contact algorithm in the model. Simulation results are compared with available experimental data. The application of the model to materials with a high resistivity, such as steel, enables to identify interesting phenomena and opens new possibilities for the industrial application of this high velocity forming technique.
Abstract: A porous SiO2-doped TiO2 photocatalyst was prepared through co-sol-gel method used for photocatalytic degradation of methyl orange. PEG1000 was used as a template. Photocatalytic degradation was conducted after adsorption equilibrium to identify the contribution of both adsorption and photocatalytic degradation. While PEG addition ranged from 0.25 g to 1.0 g, the optimum addition amount was at 0.5 g. The degradation rate increased with increasing calcination temperature in the range from 400 to 500 oC, and then it decreased with still increasing temperature. The photocatalyst calcinated at 500 oC for 4 h could degrade 29.2% of the initial methyl orange in 30 min. Nearly 96.5% of decoloration of the initial methyl orange was removed in 100 min under UV light irradiation with the existence of the porous SiO2-doped TiO2.