Advanced Materials Research Vols. 926-930

Abstract: The anti-rust mechanism of TW742 is mainly studied in this paper. TW742 was dissolved in kinds of base oils to make anti-rust oils, and the effect of these oils were tested through some experiments, which indicated that both the humid heat test and the salt water immersion were good. So it is concluded the protective film of TW742 on the metal is mainly Physical adsorption film, which can keep H₂O、O₂、Cl^-、from the metal.

Abstract: Current use and application of nanotubes has mostly been limited to the use of bulk nanotubes, which is a mass of rather unorganized fragments of nanotubes. Bulk nanotube materials may never achieve a tensile strength similar to that of individual tubes, but such composites may, nevertheless, yield strengths sufficient for many applications. Bulk carbon nanotubes have already been used as composite fibers in polymers to improve the mechanical, thermal and electrical properties of the bulk product. The strength and flexibility of carbon nanotubes makes them of potential use in controlling other nanoscale structures, which suggests they will have an important role in nanotechnology engineering.

Abstract: Hierarchical nanostructure Fe3O4/multi-walled carbon nanotubes (Fe3O4/MWCNTs) were prepared by solvothermal process using acid treated MWCNTs and iron acetylacetonate in ethylene glycol as reduction reagent. The materials were characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET). The results showed that petal-like hierarchical Fe3O4 grew on MWCNTs and the Fe3O4 nanoparticles had diameters in the range of 55-110 nm. It was a facile approach to grow hierarchical nanoFe3O4.

Abstract: 1N-Acetyl-3-phenyl-5-(3,4,5-trimethoxyl-phenyl)-2-pyrazoline has been synthesized and the crystal structure has been determined by means of single-crystal X-ray diffraction. The pyrazolinyl ring and the phenyl rings at 3 positions of the pyrazoline are almost coplane , with their dihedral angle to be 6.63(2) o. Phenyl ring at 5 positions and pyrazolinyl ring are almost perpendicular, the dihedral angle is 78.03(3) o.

Abstract: As model compounds to petroleum fractions, the novel phthalocyanine derivative was synthesized and characterized. The self-association behavior of the phthalocyanine derivatives in water-DMSO were investigated by UV-visible (UV-vis) absorption spectra.

Abstract: Zinc phthalocyanine was prepared with improved method with high yields and characterized by XRD and FT-IR analysis. The SEM analysis was also conducted to demonstrate the apparent morphology of the synthesized compound. Dimerization of the zinc phthalocyanine was measured by UV-Vis spectroscopy in N, N-dimethyl formamide (DMF). The red–shift of maximum absorption wavelength and deviation from Lambert-Beer law was observed with increasing the concentration.

Abstract: ZnO thin films were deposited on simple glass substrate by sol-gel technique. The structure, morphology and luminescence of the annealed ZnO thin films were characterized by X-ray diffraction (XRD), atomic force microscope (AFM), ultra-violet spectrometer (UVS) and photoluminescence (PL) spectroscopy, respectively. The XRD experiments shows that all of the samples annealed at 300°C, 400°C, 500°C have a hexagonal wurtzite structure. Absorption spectrum shows that all the samples have high transmittance in the visible range and have a strong absorption near the band edge of ZnO. The morphology of the samples studied by the AFM shows an increase in the annealing temperature causes the surface flatter and the grain size larger. The PL spectrum shows obvious peak near 380nm.

Abstract: Polysulfone ultrafiltration membrane was prepared by the method of Phase inversion. Casting solution consists of methanol, ethyl alcohol and DMAC as coagulation bath. The concentration of the additive was 5%. Section structure and surface structure of polysulfone ultrafiltration membrane were tested and characterized.

Abstract: This paper reviews all possible traditional methods to digest natural polysaccharides, which have been widely used as depressants or flocculants in flotation. Its characteristics of environmental friendly, highly selectivity and availability helps a lot in its application either in food or mining industries. The common digestion methods in flotation of polysaccharides, such as starch or dextrin, include thermal treatment at different temperatures or alkali-digestion at different concentrations.

Abstract: The thermal stress field in the polysilicon was simulated and comparatively analyzed at different shapes of crucibes which have different types of a flat, a inverted-conical and concave bottom by COMSOL Multiphysics version 4.3a. The results indicated that: within the flat-bottomed crucible ,the isotherm in the crystal was slightly convex and the area of the maximum thermal stress was distributed in the bottom of the crystal edge and near the top of crystal edge; within the inverted-cone crucible, the isotherm in the crystal was straight and the area of the maximum thermal stress was only distributed in the bottom of the crystal edge; within the bottom of the concave crucible, the isotherm in the crystal was slightly concave and the area of the maximum thermal stress distributed in the bottom of the crystal edge was larger than that of the crystal within the first two kinds of crucibles. To sum up, the inverted-cone crucibe was beneficial to reduce the thermal stress distribution in the polysilicon which could provide theoretical guidance for improving the production process of the polysilicon.