Advanced Materials Research Vol. 661

Abstract: Cr₃C₂-WC-Ni nanocomposite powders with ~50-100 nm were synthesized from precursors by vacuum-aided carbothermal reduction at only 750 °C for 2 h. The phase composition and microstructure of the synthesized products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The present study shows that Cr₃C₂-WC-Ni nanocomposite powders contain two kinds of solid-solution phases, namely Ni and (Cr, W)₃C₂ solid solution, respectively. WC and W₂C phases do not appear inreaction products due to the dissolution of tungsten atoms into Ni and Cr₃C₂ unit cells. Especially, there is a change of the crystalline structure for (Cr, W)₃C₂ phase from 750 °C to 800 °C.

Abstract: A novel measuring method based on Fe-based nanocrystalline alloy was studied to achieve accurate measurement of the lubrication oil pressure of auto engines. A magnetoelastic inductance pressure sensor was designed. Its operating principle, structure, output characteristics, and major parameters were discussed. The static characteristics of the sensor as well as its temperature, excitation circuit intensity, and influence on output frequency were analyzed through an experiment. Results show that the sensor is stable and reliable at high temperatures, and it has a simple structure. It can efficiently measure the lubrication oil pressure of auto engines.

Abstract: Highly ordered TiO2 nano-tubes arrays (TNTAs) electrode was fabricated through anodization. The effects of some experimental parameters on photocatalytic (PC) activity and photoelectrocatalytic (PEC) activity were investigated in detail. It was found that the optimum preparng conditions were as followed: the applied voltage, water content, fluoride concentration, anodization time and reaction temperature was 20 V, 40 vol%, 0.5 wt%, 2 h and 40 °C, respectively. In addition, the TNTAs electrode exhibited high PC and PEC activities, in which 39.1% and 65.7 % of methyl blue (MB) could be mineralized, respectively. The high PC and PEC activities could be attributed to the highly nano-tubular structure and mixed crystallite composition, which could facilitate the separation and transfer of the photogenerated charge carriers.

Abstract: In order to solve some problem of torque measuring for automatically controlled system, a new non-contact torque sensor based on the amorphous alloy was discussed in the paper. At first the principle and structure of the sensor were presented .then output characteristic, sensitivity and the non-linear error of the sensor were analyzed. Finally, an experiment of measuring torque was made on a test stand. The experimental result shows the sensors have some characteristic such as higher sensitivity and simpler structure and is convenient for installation.

Abstract: This paper presented an elaboration on environment-friendly antibiotic nanometer materials, and analyzed the application of nanotechnology in the indoor decoration. And also it applied the environment-friendly non-antibiotic materials in interior decorative materials such as floor tiles, wall tiles, latex paint, carpets, bathroom facilities and kitchen utensils. It is innovatively environmental friendly, antibacterial, anti-aging, antifouling and fireproofed with many other outstanding properties for the decoration material, so it has wide application and good prospects.

Abstract: The corking both end silica nanotubes were prepared with the functionalized silica nanotubes and dialdehyde starch nanoparticles（DASNP）by "schiff base" reaction. Moreover, these silica nanotubes were characterized by TEM or 29Si-NMR. The results would provide the material base for silica nanotubes delivery drug system.

Abstract: The nano-inorganic polymer coagulant, poly-ferric-aluminum-silicate-sulfate (PFASS) modified by quick lime were prepared from oil shale ash, which were evaluated by treating sewage. The following results are discovered: The samples contain (CaO)_xSiO₂•zH₂O, Fe₂(SO₄)₂(OH)•5(H₂O), NaAl(SO₄)₂•(H₂O)₆ and other crystal; PFASS are complicated compounds by iron, aluminum, silicon and other ions rather than simple mixtures of raw materials. The optimal coagulant dosage is about 80-100 mg/L for the turbidity removal, and the range of the suitable dose is wider for COD removal, the optimal dose of quick lime is 2.5 g for turbidity removal and 3 g for COD removal.

Abstract: By using Four-ball test machine, the anti-wear and extreme pressure performances of base oil that contain aluminum nitride (AlN) nanoparticles additive was investigated. The experimental results showed that nanoparticles additive can effectively improve extreme pressure and anti-wear performance of base oil, and the optimal concentration of it in the base oil is 3 wt%. AlN and T106 compatibility experiments showed that T106 can improve extreme pressure and anti-wear performance of AlN nanoparticles additive. Two additives have synergies to improve extreme pressure and anti-wear performance of base oil.

Abstract: A subwavelength metallic slit is proposed to generate super-strong nano-illumination. We use the finite-difference time-domain method to present that character. By changing a subwavelength slit into several slits and fixing the total volume of the air slits, we found that the energy was enhanced in the nano-slits. The more nano-slits have the better effective of enhancement. The slits also make the output light beams focusing. Because of the successive enhancement processes, the light from the nano-slit could become hundred times stronger than the incident light and accordingly could have great potentials for applications in optical data storage, super-resolution imaging, lithography, photonics, and other applications that need nano-illumination.