Advanced Materials Research Vols. 850-851

Abstract: In order to investigate the feasibility of alternative of Inulin and Inulin Granules in processing applied, the influence of the processing properties of inulin and Inulin Granules has carried on the comparative analysis in experiment .The results show that, in gel application of raw material, the gel formed at the concentration of 40%, and took 6 hours for gelation. All of Inulin Granules and inulin in gel processing properties differences were not significant, can replace each other. Applications in raw Water Holding Capability, which can replace each other in a certain extent; The pervious to light transmittance, freeze-thaw stability and acid stability was no significant difference; The viscosity of both all can reach more than 140 MPa·S, conform to the viscosity of colloid product specifications.

Abstract: Silica and polystyrene (PS) microspheres assembled on two quite different patterned silicon substrates, cross-like pillar pattern and eye-like pattern, respectively. The results indicated that the surface pattern imposes a predetermined lattice orientation in colloidal crystals (CCs). Other influent factors, such as microsphere size, the altitude of pattern and the concentration of colloidal suspension, may also play an important role on the self-assembly process.

Abstract: Based on the theory and algorithm of BP neural network, the deformation behavior of TC16 titanium alloys is studied under different quenching temperature. Mechanical properties of TC16 were measured by tensile experiments and use the BP neural network model to train and simulate the experimental data. Results show that using the BP neural network method can get high calculation accuracy and the prediction errors are around 5%.This method is suitable for further research of TC16 alloy.

Abstract: A sensitive amperometric acetylcholinesterase (AChE) biosensor based on platinum-palladium nanoparticles (Pt-Pd NPs)-single-walled carbon nanotubes (SWCNTs) and chitosan (CS) modified glassy carbon electrode (GCE) is developed. The Pt-PdNPs-SWCNTs-CS nanocomposites offer an excellent electron conductivity, catalysis and hydrophilic surface for biomolecule adhesion. CS is used as a cross-linker to immobilize the AChE on the surface of Pt-PdNPs-SWCNTs-CS and as a protective membrane of the AChE biosensor. The biosensor shows favorable affinity to acetylthiocholine chloride. It exhibits good sensitivity, stability, reproducibility and low cost, thus providing a promising tool for analysis of enzyme inhibitors. More importantly, this study could provide a universal platform for meeting the demand of the effective immobilization enzyme on the electrode surface.

Abstract: Poly (3-bromothiophene) was prepared by FeCl₃ oxidative polymerization. UV-Vis spectrum, fluorescence spectrum, photoluminescence (PL) spectrum and cyclic voltammograms of poly (3-bromothiophene) were recorded.The maximum absorption peak at 380 nm and the maximum emission peak at 504 nm. Scanning electron microscope (SEM) of poly (3-bromothiophene) shows that its morphology is nanowire structure. Poly (3-bromothiophene) exhibits good electrical properties with conductivity of 0.8 S/cm.The optical band gap, electrochemical band gap, HOMO/LUMO energy were calculated with the value of 2.38 eV,1.99 eV,-5.18 eV and-3.19 eV , respectively.

Abstract: The marine atmospheric environment spectrum of Xisha was compiled by using the environmental data of Xisha atmosphere test station. The determination method of the parameters of every process and the equivalent relationship between the accelerated spectrum and the actual use environment were presented by the equivalent conversion method. The accelerated corrosion test methods were composed of ultraviolet radiation and periodic soakage, and carried out verification tests of indoor and outdoor corrosion. The accelerated corrosion test methods provide a reference for the study on corrosion behavior of 7A04 aluminum alloy in the typical oceanic and atmospheric environment of Xisha.

Abstract: A failure criteria basing on Drucker-Prager yield criterion for geomaterials is modified in terms of the inherent anisotropy of the friction angle and the dilation angle. To implement the model in a numerical way, the corresponding consistent return mapping algorithm is formulated and by dividing the scalar product of the stress rate and the strain rate into the deviatoric and spherical parts, the consistent elastoplastic tangent modulus matrix is obtained. Then, the codes are introduced into finite element software ABAQUS via the UMAT. An example has been presented illustrating influence of the anisotropic degree on the bearing capacity and the pattern of strain localization.

Abstract: The investigation has been conducted to establish the effect of preparation methods on the textural properties, the metal-support interaction of the Co/ZrO₂ catalysts and consequently its influence on Fischer-Tropsch synthesis. Coprecipitated Co/ZrO₂ catalyst showed the strongest cobalt-zirconia interaction, the lowest reduction degree, and the lowest catalytic activity. Impregnated Co/ZrO₂ catalyst showed the weakest cobalt-zirconia interaction, the highest reduction degree and the highest catalytic activity, while Co/ZrO₂ catalyst prepared by directly impregnation Zr (OH)₄ with cobalt nitrate solution were in the middle of CZC and CZI. The differences among the three catalysts could be ascribed to the different aging time of the support.

Abstract: The effects of lanthanum promotion on cobalt based catalysts in Fischer-Tropsch synthesis were investigated. The Co/ZrO₂ catalysts promoted by lanthanum had higher activity and selectivity in Fischer-Tropsch synthesis. The catalyst with the La content 1% had the highest activity and selectivity attributed to the promotion effect of La. However, excessive La addition could depress the activity of the catalyst due to the Co-La interaction and the lower reduction degree.

Abstract: Nanocrystalline silver selenide (Ag₂Se) with an average diameter of 100 nm were prepared by a facile solvothermal method. X-ray energy dispersive (EDS) spectroscopy and X-ray photoelectron spectroscopy (XPS) studies confirmed that the products were pure Ag₂Se. Room-temperature powder X-ray diffraction (XRD) measurements indicated that the as-prepared Ag₂Se nanocrystals exhibit a metastable tetragonal polymorphic phase, rather than the common orthorhombic phase at room temperature. The variable-temperature XRD and differential scanning calorimetry (DSC) thermal analysis techniques were used to investigate the phase change behaviors of the tetragonal Ag₂Se nanocrystals, and the results showed that the low-temperature tetragonal phase transforms to the high-temperature cubic phase at about 106 °C. This transition temperature is lower by ~30 °C than the orthorhombic-cubic transition temperature (133140 °C) previously reported for Ag₂Se. Meanwhile, two exothermic peaks, loaded at 61 and 89 °C, respectively, were detected in the cooling DSC scan for the cubic to tetragonal phase transition, and the reason was discussed.