Advanced Materials Research Vols. 557-559

Abstract: B-doped TiO₂ nanoparticles have been successfully prepared using hydrothermal synthesis with tetrabuttyl titanate and boric acid as precursor. The prepared samples were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (UV-vis DRS), scanning electron microscope (SEM). The B-doped TiO₂ nanoparticles were red-shifted than P25. And the degradation rate of B-TiO₂ is 72.62% in 120 min by degradation of salicylic acid under visible light irradiation.

Abstract: The Finnis-Sinclair many-body potential model was utilized to construct the interatomic potential function in B2 type FeAl alloy at equilibrium state. According to the model, the binding energy, the elastic constants C₁₁, C₁₂ and C₄₄ were calculated, and the results agree well with the experimental results. The formation energy of different defects, such as monovacancy and anti-site, in the B2 FeAl alloy were also studied.

Abstract: The formula of the environmental protection PVC sheathing compound used for wires and cables contains: the base resin, composite stabilizer, plasticizer, filler, antioxidant and lubricant. Each component’s effects on the performance of the sheathing compound were studied. The optimized formula was established as: 100.00 phr PVC , 6.80 phr Ca/Zn stabilizer, 36.30 phr TOTM, 14.0.80phr DIDP, and 30.50 phr heavy calcium carbonate agent. The product properties were demonstrated by a series of experimental means. The results indicate that this formula system contain neither heavy metals such as lead, cadmium, hexavalent chromium and mercury, nor polybrominated biphenyls and their ethers, which can cause significant damage to people and the environment. The product property completely meets the performance standards set for the environmental protection 105 °C PVC sheathing compound.

Abstract: As a harmful impurity, Pyrophyllite must be remove in synthetic diamond purification process. It commonly use chemical method. A trial research is made on the removing of pyrophyllite impurity in synthetic diamond by physical method. As a result, after synthetic diamond materials containing pyrophyllite are selectively interground in the ball grinding machine, the pyrophyllite is effectively broken and removed from the coarse – medium grade diamond only by physical method, but diamond quality is not affected.

Abstract: The ferrimagnetic glass-ceramic based on SrO-Na₂O-Fe₂O₃-FeO-P₂O₅-SiO₂ system was prepared for hyperthermia application using aqueous aolution-melt method. Using the aqueous solution solvent evaporation, we obtained the molecular-scale homogenously glass precursor. The precursor was completely melted in a lidded platinum crucible placed in an electric furnace at 1480°C for 1h and then annealed in a furnace at 550°C for 40min.The annealed glasses were heat treated at 1050°C for 1h to obtain the glass-ceramics. The crystallization of the glass systems with different component has been systematically investigated by using XRD, TEM, as well as vibrating sample magnetometer (VSM). The glass-ceramics with P₂O₅=5.0wt% show a strong magnetic, which contains highest value of specific saturation magnetization of 24.89A•m²/kg.

Abstract: This paper deals with the compressive strength and shrinkage of polymer modification repair mortar (PMRM) with Metakaolin (MK) and Metakaolin-based composite material(MS),the microstructure of PMRM was studied by MID and SEM. The results show that the strength and shrinkage of PMRM are improved remarkably with the incorporation of 3% and 5% MK. Moreover, the PMRM with the incorporation of 5% MS exhibits a better mechanical and shrinkage performance, the tests of MID and SEM indicate that the pore structure is optimized by 5% MS.

Abstract: The dynamic mechanical analyzer (DMA) was applied to investigate the damping properties of Mg-6Zn-0.6Zr alloys. The results show that the as-cast Mg-6Zn-0.6Zr alloy exhibits higher strain amplitude independent damping performance than that of as-homogenized. The strain amplitude dependent damping of the as-homogenized has the best damping performance with the strain amplitude from 3×10-5 to 6×10-4, and the as-extruded is the lowest. When the strain amplitude exceeded 6×10-4, the as-extruded has the best damping capacity all the time within the experimental strain amplitude, and all the alloys reach the high damping capacity. Two critical strain amplitude points were detected in the alloy as-extruded and as-homogenized. The damping peak value is 0.0192 with the strain amplitude of 1.5×10-3 presented in the alloy as-extruded.

Abstract: A set of pillared montmorillonite (PILM) catalysts were prepared by exchanging Na⁺ with iron pillars, chromium pillars, complexes pillars of iron and chromium with different proportion, as well as complexes pillar of silica sol and iron and chromium, respectively. X-ray diffraction (XRD), X-ray fluorescence (XRF), thermogravimetry (TG) and differential thermal analysis (DTA) were used to characterize the catalysts. The XRD results reveal that Fe-Cr complexes pillared montmorillonites (Fe/Cr-PILM) have the basal spacing of about 2.04 nm after calcination at 300 °C for 2 h, while sole metal PILM have that of about 1.0 nm; in particular, the basal spacing of silica sol complexes pillared montmorillonite (Fe-Cr-Si-PILM) are expanded up to 4.33 nm. The TG-DTA results show that both Fe-Cr-PILM and Fe-Cr-Si-PILM have high thermal stability up to 640 °C. Catalytic activity of Fe/Cr-Si-PILM in Longkou lignite (LL) and ShengLi coal residue (SCR) liquefaction was studied, which showed that PILM had a good catalytic performance in coal conversion field.

Abstract: The nitrogen implanted profiles in cobalt films that are generated by N₂⁺ bombardment with three energies of 0.5, 2.0 and 5.0 keV are simulated by the analytical Schulz-Wittmaack expression and the SRIM program, respectively. Taking the both simulated profiles as concentration-depth profiles, the corresponding measured AES depth profiling data of implanted nitrogen are perfectly fitted by the Mixing-Roughness-Information depth (MRI) model.

Abstract: Al–Sn co-doped ZnO thin films were fabricated onto quartz glass substrates by the sol-gel method. The surface morphology, electrical and optical properties at different post-deposition heating temperatures were investigated. The grains of preferred c-axis showed a well-mixed microstructure and the peak height was enhanced with the post-deposition heating temperature increasing from 400°C to 600°C. Doped films showed a preferential orientation along the (002) plane, while the preferential orientation changed to the (101) plane when temperature was higher than 500°C. The lowest resistivity 6×10–3Ω•cm was observed from samples made at 500°C, with an average 91.2% optical transmittance in the visible range. In this study, optical band gap of all the doped films were broadened, regardless of post–deposition heating temperature.