Advanced Materials Research Vols. 239-242

Abstract: In this paper, the one bath dyeing technology of wool and silk was studied, which were colored with neolan dye. The best dyeing conditions of homochromatic property were obtained by the optimization of the dyeing temperature and heat preservation time and the adjustment of the auxiliaries, when the wool and silk dyeing in the same bath. Experiments show that the best homochromatic property of wool and silk in one bath dyeing was obtained when the dyeing temperature was 85°C-95°C, the heat preservation time was 30 minutes and the amount of sodium sulphate was 20g/L.

Abstract: Four nanoporous carbons have been synthesized by using similar silica template method. The structural characterizations showed that the carbons retained ordered hexagonal or cubic pore structure expect for disordered CS41, which was prepared using MCM-41 as template. Nitrogen adsorptions at 77 K revealed that carbons with different pore size distribution, specific surface area and pore volume were obtained. The hydrogen adsorption capacity was measured by volumetric method, and the most promising candidate resulted to be microporous carbon CS41, which exhibited the highest H₂ uptake of 1.17 wt % at 77 K and 1 bar. The capacities of hydrogen adsorbed in the nanoporous carbons were correlated with specific surface area and microporous volume. The result demonstrated that the H₂ uptake in the carbons had essential relationship with volume of pores smaller than 1 nm.

Abstract: This article uses the hydrothermal method to prepare the high dispersion spherical ZnO powders, The phase composition and microstructures of powders were characterized by X-ray diffraction (XRD), scanning electron microscopy analysis (SEM). The influence to phase compose and the microstructure of ZnO powders were investigated with the forerunner fluid pH value, the hydrothermal response temperature. The growth mechanism of ZnO powders was explored in the alkaline environment. The result indicated: Under the alkalinity condition, ZnO crystalling phase do not change with the pH value, and is for spiauterite structure. When pH value was 8 approximately, the sole sphere ZnO powders are prepared, and the ZnO powders has good dispersivity, uniformed powder particle size distribution, and the particle size is about 1.5mm. The mechanism of forming sphere ZnO pellet is reduced the concentration of OH^- ion in solution, and suppressed the growth speed of the fast growth direction, and caused each direction growth same speed.

Abstract: White light-emitting materials of Eu²⁺, Mn²⁺-codoped Ca₂SiO₃Cl₂ were prepared. Luminescence properties and other samples phase were tested by X-ray diffraction (XRD) and fluorescence spectrophotometer (PL). The results showed that the temperature range of 730°C to 760°Cand the ideal holding time is 4h~5h, the emission spectrum of Eu²⁺-doped sample under excitation at 365nm wavelength was 426nm, 524nm in a weak reductive atmosphere of active carbon, the emission spectrum of Eu²⁺, Mn²⁺ co-doped samples was 426nm, 524nm, 585nm, the three combined can produce white light.

Abstract: Inter-metallic compound of Ti₃SiC₂ was produced via modified-SHS (self-propagating high temperature synthesis). Elemental powders of titanium, silicon and graphite were weighed according to their stoichiometric ratios (3:1:2) respectively. These powders were ball milled for 1 hour, then compacted into cylindrical shape. Synthesis of Ti₃SiC₂ was carried out by using arc melting method. The effect of different arc melting time of 10, 30 and 60 seconds was studied. Phase formation and microstructure were analyzed by using XRD and SEM. The formation of Ti₃SiC₂ was confirmed by XRD, and the SEM micrograph shows that the grain is in needle shape. XRD result also shows that the impurities are present in all the samples. TiC appeared to be the common and dominant impurity in all samples, with relatively low intensities in Ti₅Si₃ and TiSi₂ phases. Some raw materials phase was still existed in sample arc melted for 10 and 30 seconds. Hence, it can be deduced that the raw materials had not yet fully taking part in the formation of Ti₃SiC₂.

Abstract: A novel mixed-ligand copper(II) complex [Cu(pht)₂(phen)H₂O] (Hpht = 5,5-diphenylimidazolidine-2,4-dione, phen = 1,10-phenanthroline) was has been synthesized solvent-thermally and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal of the copper complex belongs to Triclinic system with space group P₁, a = 11.747(14), b = 12.639(15), c = 14.021(17)Å, α= 97.986(18)º, β= 104.958(18) º, γ= 108.485(19) º, V = 1851(4) ų, D_c = 1.371 g/cm³, Z = 2, F(000) = 790, µ = 0.644mm^-1, R₁ = 0.0835, wR₂ = 0.1436 [I>2σ(I)] and GOF＝0.867. The X-ray data showed that the Cu(II) atom adopted a distorted CuN₂O₃ square pyramidal configuration when coordinated with two phen ligands and one water ligand. The antimicrobial activity of the title complex was evaluated against a series of fungi or bacteria in vitro by agar method and the filter paper method, respectively．The results showed that the title complex was more active against the Fusarim gramine arum, Escherichia coli and Staphylococcus Aureus than its precursor Hpht and Cu(Ac)₂×H₂O.

Abstract: Fe-based amorphous composite coatings were deposited on the surface of ASTM-1020 steel plate by different technologies: arc spraying, laser remelting, TIG remelting (with and without water cooling). The microstructure, phase structure and micro-hardness were characterized by using a combination of SEM, XRD and Vickers hardness tester. It shows that the coating prepared by arc spraying presents typical lamellar structure and poor adherence to the substrate. After the remelting treatment, the coating quality is significantly improved by decreasing structure defects such as cracks and pores; the interface shows the metallurgical bonding. The dendritic crystals could be obtained within all the remelted coatings with different appearances. The microstructures of TIG remelted coatings show much more regular and have obvious orientation, which cannot be seen in laser remelted coating. However, the average grain size of the laser remelted coating is much smaller than that of TIG remelted coatings. The micro-hardness values of all of the deposited coatings are much higher than that of the substrate, and the coating prepared by laser remelting shows the highest hardness.

Abstract: Based on experimental and computational fluid dynamics analysis, the phenomenon of particle back-mixing near the dust outlet in cyclone separator with tangential inlet was studied. The results show that particle back-mixing appears near the dust outlet geometry. Particle back-mixing can be divided into dust hopper back-mixing and discharge cone back-mixing for different generation mechanism. The upward flow coming from dust hopper, which occupies 17.7% of the inlet gas, can induce dust hopper back-mixing. The particle mass flow rate that caused by dust hopper back-mixing occupies 46.6% of total inlet particle mass flow rate. Precessing vortex core, bias flow and high turbulent intensity near the dust outlet can induce discharge cone back-mixing. For both dust hopper back-mixing and discharge cone back-mixing, particle back-mixing is serious near the dust outlet geometry, which occupies 56.8% of total inlet particle mass flow rate. Particle which is smaller than 18μm can mix backward. The axial distribution of particle concentration decreases sharply in a range of 1.5 D (cyclone diameter) height above the dust discharge port. At last, only 2.6% of back-mixing particles with diameter no bigger than 13μm escape from vortex finder. This effect on separator efficiency increases with the particle diameter decreases.

Abstract: Bi₄Si₃O₁₂ powders are prepared by template -hydrothermal used Bi₄Si₃O₁₂ as a template made by molten-salt method. The phase composition and morphological characteristics of BSO nanoparticles were analyzed and observed by X-ray diffraction and transmission scanning electron microscopy. The results show that with the salt content of 50wt%, calcination temperature 770°C, it can form a high purity Bi₄Si₃O₁₂ template. A single Bi₄Si₃O₁₂ phase can be obtained by template –hydrothermal, with template addition 30wt%, the reaction temperature 240°C, holding time for 24h, and prolonging the reaction time is conducive to Bi₄Si₃O₁₂ grain growth. The powders have a good dispersion, and size of particles is about 10μm or so, and show a columnar shape.

Abstract: The title complex, [(C₅H₅N)Ni(C₁₅H₁₁N₂O₂Br)], was synthesized by the reaction of the 5-bromo-2-hydroxyphenyl ethyl ketone benzoyl hydrazone, pyridine ligand and nickel chloride in acetone. The crystal structure was determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic system, space group C2/c with a = 29.507(4) Ǻ, b = 7.7738(11) Ǻ, c = 20.205(3) Ǻ, β = 126.614(2)º, Z = 8, V = 3720.1(9) Ǻ³. Its crystal structure was determined and refined to a final R= 0.0304 for 8902 independent reflections. The center nickel atom is four-coordinated. The antibacterial activity of the ligand and its complex was also studied.The antibacterial experiments indicate that they have antibacterial activity to P.aeruginosa, S.aureus, E.coli and the complex has higher activity than the ligand.