Advanced Materials Research Vols. 183-185

Abstract: In the present study, a kind of bio-based waterborne polyurethane (BWPU) /ZnO was prepared with BWPU and different concentrations of nanometer ZnO emulsion by incorporated into the BWPU matrix. The prepared BWPU/ZnO hybrid dispersions were casted in a Teflon petridish and the dried films were used for XRD, SEM, FT-IR and antibacterial tests. The results suggest that the BWPU/ZnO hold the potential applications as new materials.

Abstract: The main constituents at 230°С were propanoic acid, 2-(aminooxy)-(16.99%) , propanamide, 2-hydroxy-n-methyl-(14.20%) , benzaldehyde, 2-methyl-(13.22%) , furfural(9.44%) , butanal, 2-methyl-(8.09%) , acetic acid(7.09%) , hydrazine, methyl-(4.14%) , etc. And the main constituents at 280°С were hydrazine, ethyl-(24.87%) , 2(3h)-furanone, dihydro-4-hydroxy-(15.24%) , phenol, 2,6-dimethoxy-(11.82%) , benzaldehyde, 2-methyl-(11.49%) , furfural(4.90%) , etc. The heat release volatiles of smoked bamboo biomass might be used as raw materials of rare biomedicines. So the smoked bamboo biomass for building materials had environmental friendly characteristics.

Abstract: CuInSe₂ thin films were obtained by selenization of the Cu-In precursors in the atmosphere of Se vapour, which were prepared on stainless steel and titanium substrates by electrodeposition. The films were characterized by XRD, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The respective influences of composition, phases and surface morphology of Cu-In precursors on indium loss were investigated. The results indicate that the indium loss occurs in selenization process because of volatile In₂Se arising. The indium loss is less in selenization process of Cu-In precursors contained CuIn, Cu₂In and In phases.

Abstract: TiO₂ doped with C was obtained by way of immersion and calcinations method by using citric acid (CA) as dopant material.，and characterized by using XPS、XRD, UV-Vis, FT-IR and SPS. The results of analysis and characterization showed that C substituted partial Ti atoms in the lattice of TiO₂ and formed Ti-O-C structure. The photocatalytic properties of C-TiO₂ photocatalysts had been evidently improved as a result of a noticeable shift to visible region and the enhancement of the charge separation efficiency. The doped carbon lowers the band gap and expends the absorption of visible light region. CO₂ was photocatalytically reduced to form HCOOH by the best C-TiO₂-3/1-600 nanoparticles under the irradiation of the simulated daylight lamp. Methanoic acid yield may achieve 2633.98μmol/g-Cat when irradiation time is six hours.

Abstract: The semiconductor properties of passive film formed on 304L stainless steel (SS), 316L SS and Alloy 800HT in high-temperature and high-pressure water with zinc addition have been investigated by using Polarization curve, Mott-Schottky analysis and photocurrent method. The donor density, flat band and band gap of semiconductor behavior are analyzed to investigate the impact of zinc addition to the passive film. Analysis of the experimental results indicated that passive film formed on 316L and 800HT with zinc addition showed different electrochemical, photo-electrochemical and semiconductor properties. The results indicated that corrosion resistance of passive film from in high-temperature and high-pressure water with zinc addition was obviously better than that without zinc addition.

Abstract: In order to optimize the ultrasonic wave extraction technique of polysaccharides from Auricularia auricula, the technique conditions were carried out by response surface methodology. Then the molecular weight distribution of AAP extracted were studied. Two factors, ultrasonic wave and extraction time in water were screened from six factors . The singal-order tests and integrated curvature detection of the two factors were carried out. After that, the experiment domain approached to the optimum point, the optimum technology conditions of ultrasonic wave extraction of AAP were determined by central composite design: ultrasonic wave power 908W, extraction time 100°C, and the AAP yield of ultrasonic wave extraction approached to 24%. It was indicated that ultrasonic wave can promote the yield of the large molecular weight components by the analysis of molecular weight distribution.

Abstract: The mechano-electric behavior between carbon fiber and cement matrix was revealed by single fiber testing. The resistance between fiber and matrix was found to increase when the interfacial bonding force increased and decrease when the interfacial bonding force decreased under dynamic load, which exhibited good reversibility except the first loading. The irreversibly increasing resistance is associated with interface debonding due to the interfacial defect, and the reversibly increasing resistance is attributed to elastic deformation of interfacial structure. The interfacial shear stresses cause the change of interfacial structure, which produce an effect on conductive network of the complex, and lead to the change of resistance between fiber and matrix.

Abstract: The process parameters of LLDPE/EVA/nano-ZnO composites were optimized by two methods. Samples were prepared under the better process parameters. The dispersion morphology and the mechanical properties of material were studied by Field Emission Scanning Electron Microscope (FESEM). And the mechanical properties of LLDPE/EVA/nano-ZnO composites were tested. It was showed that the optimization method based on neural network of BP and particle swarm optimization was better than that optimization method based on orthogonal experiment. The nanoeffect of ZnO particles was exerted which were distributed in LLDPE/EVA matrix, which result in the effect of reinforcing and toughening. Two-step method was better than direct dispersing method. The tensile strength was the highest when nano-ZnO amount was 3% under the two-step, the tensile strength was increased up to about 22%, and the fracture elongation rate was increased up to about 11%.

Abstract: To research basic property of Shengma fibre（green textile fiber）, basic property of Shengma and viscose were tested and analysed. Through analysing and contrasting each property it is considered that under normal temperature and dry condition, breaking tenacity of Shengma is less than that of viscose, while breaking elongation rate of Shengma is larger than that of viscose. In wet condition change of Shengma fibre mechanical property is less than that of viscose. Crimpability of Shengma fibre is worse than that of viscose.

Abstract: Ultrasonic technology was applied for phenolic compounds extraction from the Pinus koraiensis bark （PKB） and response surface methodology (RSM) was used to optimize the effects of processing parameters on phenolic compounds yields. When ultrasonic power 160W,three independent variables were ultrasonic extraction time (X1 20-40min), ratio of water to raw material (X2 1:20-1:40 g/mL)and ethanol concentration(X3 20％-60％), respectively.The optimal extraction conditions of phenolic compounds were determined as follows: Ultrasonic extraction time 30.61 min, ratio of water to raw material 30.79 mL/g and ethanol concentration 42.2%. Under these conditions, the experimental yield of phenolic compounds was 8.2409 ± 0.0648‰, well matched with the predicted models with the coefficients of determination (R2) of 0.9920, which was agreed closely with the predicted value (8.2963‰).