Advanced Materials Research Vols. 960-961

Abstract: Modern society,with the rapid development of economy,people living standard increasing, for the plate demand continues to grow. Because the forest resources dwindling, To make full use of waste bagasse, corn straw and non wood fiber materials to produce an artificial plate material instead of wood man-made board has be imperative.Corn straw shavings can realize the recycling of waste materials, bring the economic value, so this topic with corn straw shavings as raw material, in the laboratory preparation of melamine resin adhesive, pressing flake molded sheet.Melamine plastic using M ( melamine ):U ( urea ) :F ( formaldehyde ) =1∶0.6∶2.5, adhesive solid content is 54%, the sizing, hot pressing temperature, hot pressing time as three factors orthogonal experiment, pressed sheet. On the plate thickness swelling, internal bond strength and surface plate bending strength test, on the analysis and summarization of results, the optimum process parameters: sizing quantity20%, temperature 150 °C, hot pressing time25min. The corresponding optimum mechanical properties: the absorbing water thickness expansion rate (2H ) 9.76%, inner strength, bend strength of17.49Mpa,0.45MPa. Key words: Non wood shavings; Molded sheet; Process parameters; Mechanical properties

Abstract: The open-loop albumin dialysis mode (OLM) is usually used to remove protein-bound toxins from artificial liver support systems. However, there is still interest in closed-loop albumin dialysis mode (CLM) because this mode could enable the regeneration and reuse of albumin and minimize the physical size of liver support systems. In this paper, the two dialysis modes were theoretically compared under various theoretical conditions. Our results show that at the beginning of the dialysis period, in terms of detoxification efficiency, CLM is better. As the molar ratio of toxin to albumin in the blood (RTA) decreases, the overall performance of CLM approaches that of OLM in 4-hour dialysis. In certain cases, the clearance of albumin-bound toxins by CLM could be as effective as that by OLM; occasionally, CLM is even more effective.

Abstract: Based on the ETA/DYNAFORM elastic-plastic explicit finite element platform, the finite element model of high internal pressure forming was established and the forming process was simulated. Through simulating, the forming process was researched. The distribution law of wall thickness, stress and strain was revealed in forming process. The results show that: the thinnest wall lies in the middle of forming part, and the thickest wall in the end of feeding areas. Both maximum equivalent stress and minimum equivalent strain lie in the forming fillet of the large elliptical cross-section. These play an important guiding significance on molding process.

Abstract: There are a series of problems existing in global issues, such as the increasing energy demand, environmental pollution, haze and global warming. Thus, the hydrogen energy attracts more attention of new energy industry. The materials of hydrogen storage are ideal renewable energy carrier; the combustion of hydrogen forms water is pollution-free for the environment and releases large amounts of heat. This paper systematically introduces the structure, preparation methods, and hydrogen storage capability of boron nitride nanotubes. It also highlights the importance of boron nitride nanotubes, which we believe will play a promoting role for the hydrogen storage materials.

Abstract: ZnO with different morphologies were formed on Zn foils immersed in various concentrations of CuSO4 solutions. Then the specimens were heated at temperature of 200~600°C in air for 3h. The morphologies of as-prepared specimens were characterized by a scanning electron microscope (SEM). Water wetting angles on the specimens were measured. The results indicate that the morphologies of ZnO on the Zn foils relate to the CuSO4 concentration of in solutions. The morphologies on the specimens with dual-scale (nanoand micro) structure have higher wetting angles than those with flat structure. The water wetting angles can reduce with the increase in annealing temperatures of immersed specimens. The water wetting angles increase with keeping immersed specimens at room temperatures. The change of the wetting angle is explained by absorption of organic carbon on specimen surface and the geometric structure of the surface.

Abstract: Sulfur dioxide (SO₂) including combustion exhaust gas is must be clarified because of its air pollutant in middle-scale facilities or marine ships. In this study, dry DeSO_x filter is developed to capture SO₂ within diesel exhaust. CaCO₃ is focused on as SO₂ absorption material. However, SO2 absorption materials has to be improved low temperature activity below 723 K. To improve the low-temperature desulfurization performance, physically and chemically modified CaCO₃ was synthesized using the amorphous citric acid complex method and base adducted complex method. Development of CaCO₃ having high specific surface area of 169 m₂/g (HSSA CaCO₃) by the amorphous citric acid complex method was succeeded. Then, Li or Na doped complex CaCO₃ by HSSA CaCO₃ was synthesized by base adducted complex method. It is found that these Li-doped complex CaCO₃ have higher SO₂ absorption performance than conventional CaCO₃ and HSSA CaCO₃. Its performance is reached 0.31 g_SO2/g_material at reaction temperature of 723 K by TG experiment, as a comparison, that of conventional CaCO₃ is 0.02 g_SO2/g_material.

Abstract: The effect of electron beam irradiation on permittivity of silicon dioxide insulate layer was investigated. Theoretical analysis indicates that electron beam irradiation will change the permittivity of SiO₂ through decreasing the molecular number per unit volume and increasing the polarizability of the sample. The escape of impurities during irradiation decreases the permittivity while the accumulation of space charge increases the permittivity. Simulation results show that with the change of permittivity, the electric field of the area irradiated by electron beam is strengthened locally and carbon nanotubes (CNTs) are more likely attracted to this area by dielectrophoresis. Therefore, the method could be used for precise positioning of CNTs for various applications in many areas including nanoelectronics, sensors, and new energies.

Abstract: For preparing 4’,4’’(5’’) di-tert-butyl-dicyclohexyl-18-crown-6 with high yield under low H₂ pressure, the support, active component, promoter, reduction time and reduction temperature were studied. The catalyst structure and composition were characterized by XRD, TEM and EDS. The experimental results showed that MgO was the most suitable catalyst support because of its weaker acidity than other supports. The higher hydrogenation activity and selectivity were observed when Rh was used as the active component and Fe was used as promoter owing to the cooperative interaction. The optimum reduction temperature and the reduction time were 500 oC and 3h, respectively. The specific surface area of Rh-Fe/MgO was 133m²/g, and the Rh-Fe was well dispersed on MgO with the particle size about 20 nm. Under a low H₂ pressure (4 MPa), the 4’,4’’(5’’) di-tert-butyldibenzo 18-crown-6 conversion was 78% and 4’,4’’(5’’) di-tert-butyl-dicyclohexyl-18-crown-6 yield was 53% catalyzed by Rh-Fe/MgO, which were higher than that catalyzed by single metal catalyst.

Abstract: To study the influences of snowmelt agent to performances of asphalt,three snowmelt agents of NaCl,CaC1₂,CH₃COONa·3H₂O were used to make asphalt sample and experiments about performances of high temperature and low temperature of asphalt were done.The results indicated that: temperature sensibility of 90# asphalt was reduced, softening point was increased ,dynamic viscosity was increased and ductility was reduced after being dealedwith snowmelt agent; Residual penetration ratio and residual ductility were also reduced after being dealedwith snowmelt agent.

Abstract: The roadbed base of railway in Qarhan Salt Lake area entirely consists of brine saturated rock salt formations. However, low salinity brine would cause corrosion for roadbed and the stability of rock salt roadbed would be directly affected. In this paper, physical and mechanical properties of brine-dissolved rock salt have been tudied, as well as Computer Tomography was used to scan and analyze the meso-structural changes in rock salt before and after corrosion. The results show that density of rock salt would be changed obviously in the process of corrosion.The deriving or closing of meso-fissures in rock salt could been found with rock salt immigrating and corrosion damage.