Advanced Materials Research Vol. 738

Abstract: In order to get the energy consumption relationship in the heating process of metal material, the probability and statistics law between the temperature distribution and surface heat flux density of heating metal material is established in this paper. Moreover the surface heat flux density distribution of heating metal material is used to associate with its energy consumption. And it builds a new technology method for saving energy control decisions.

Abstract: Monodispersion of multi-walled carbon nanotubes with assistance of surfactants has become a usual procedure. A parametric analysis of sonication was performed in order to optimize the preparation procedure of MWCNTs monodispersion solution. MWCNTs solutions were characterized with results of UV-VIS absorbance and FT-IR spectra in order to find the optimal sonication time and power. Perfect sonication time obtained at the higher absorption peak 2.699 in 400nm is 42min, which can be define as sonication cycle. MWCNTs can achieve its optimum dispersion situation, when onication power is 270w, In this case, zeta potential can get as high as-45.2mv. Film achieved under combination of two kinds of optimization parameters is more smoothy and integrated.

Abstract: Solid state ionization potential and electron affinity of iridium (III) metal complexes containing the 2-phenyl pyridine-type ligands was calculated using density functional theory (DFT). It is shown that the calculated results are in well agreement with the experimental values. With this approach, it is convince to obtain solid state ionization potentials and electron affinities of a range of neutral transition metal complexes.

Abstract: Graphene nanosheets were prepared by chemical reduction of the exfoliated graphite oxide using sodium borohydride (NaBH₄). The graphene/epoxy composites were separately fabricated in the absence or presence of imidazolium-based ionic liquids, and their dynamic thermomechanical and tensile properties were studied. TEM examinations show that graphene sheets are well dispersed in the epoxy resin and have strong interface adhesion with the matrix due to the π-π and/or cation-π interactions between graphene and imidazolium ions. The composite fabricated by assistance of ionic liquids shows larger increases in Youngs modulus, tensile strength, storage modulus and glass transition temperature compared to the composite without using ionic liquids. This work provides a method for the fabrication of multifunctional graphene-based polymer composites.

Abstract: Fiber woven membranes were prepared with konjac glucomannan (KGM) and sodium hyaluronate (SH). Glycerol was added as plasticizer and lactic acid as modifier. After treatment with microwave,wet spinning method and the programmable 2D mobile platform were used to prepare the KGM/SH fiber woven membranes. The in vitro degradability of the fiber membranes was tested by PBS immersion. The biological activity of the fiber woven membranes was observed by SBF mineralization experiments. The cytocompatibility was also investigated via co-culture of stem cells. It was revealed that the fiber woven membranes had good biological activity, degradation rate and cytocompatibility, which indicated that the membrane has a good prospect as a potential cartilage scaffold.

Abstract: Unsoluble composite films have been prepared by blending konjac glucomannan (KGM)/sodium hyaluronate (SH) aqueous solution with chitosan (CS) solution in acetate solution, filtering, deaerating, tape casting, drying at 55°C for 8h and crosslinking with the aid of sodium hydroxide solution for 2h. The effect of KGM content on the structure and properties of SH/CS/KGM composite films were investigated. It was indicated that the KGM can significantly improve the tensile strength (σ_b) and breaking elongation (ε_b) of the SH/CS composite films, and the tensile strength (σ_b) and breaking elongation (ε_b) increased with the increase of KGM content in composite films. It was revealed by IR and X-ray analysis that the crystallinity of composite films decreased with the increase of KGM content and the composite films was mainly amorphous. It was indicated via scanning electron microscopy (SEM) and bone marrow mesenchymal stem cell experiments that the films could support the growth of cells and were non-toxicity and good biocompatibility.

Abstract: To obtain the material parameters for the composite laminate structure based on the general strength theory and failure criterion, a series of strength experiments are required to be carried out for some typical laminated fiber reinforced composite laminate plate. Due to complexity of stress state of specimen, some unexpected failure modes will often appear in the tensile test process of composite laminated plate. In this paper, according to the tensile test, the analysis for the failure mechanism of the specimen was executed by using finite element method. The suggestion for suitable geometry of the specimen was put forward, and the experimental results proved that the improvement for the specimen design was effective, thus the success rate of test was improved.

Abstract: First, Ti6Al4V alloy samples were modified by tantalum ion implantation at a dose of 1.5×10¹⁷ ions/cm², and then silver ion at a dose of 1×10¹⁷ ions/cm². Glancing angle X-ray diffraction analysis was used to characterize the phase composition of un-implanted Ti6Al4V alloy and Ta+Ag dual-ion-implanted Ti6Al4V alloy samples. X-ray photoelectron spectroscopy analysis was used to investigate the chemical states of the elements on the Ta+Ag dual-ion-implanted Ti6Al4V alloy sample’s surface. The results show that small amounts of Ta and Ag were present in their elementary forms, along with TiO₂, Ta₂O₅, and TaO_x.

Abstract: Polychlorinated biphenyls (PCBs) are Persistent Organic Pollutants (POPs). This experiment screened a halophilic bacterium from the deep sea sediments, which could grow at the salinity of 15%, and designated as B2.6. The cells of this strain were rod shaped, Gram negative, motile, could grow in pH range of 5.0-9.0, and temperature range 10-37°C. Growth of this bacterium in the presence of PCBs, as the sole source of carbon and energy. The ions of IA, such as Na⁺ and K⁺ could enhance the activity of PCBs-degrading enzyme, while the transitional metal ions, such as Co²⁺, Mn²⁺, Cu²⁺, Fe²⁺ and Fe³⁺ may inhibit it in a certain degree. The optimal temperature, pH value and concentration of NaCl for the PCBs-degrading enzyme were 25-35°C, pH 6-8 and 50 g·L^-1, respectively.

Abstract: Zn-Ni alloy coatings were electrodeposited on low carbon steel substrate using a cyanide-free alkaline bath containing tetraethylenepentamine (TEPA) and triethanolamine (TEA) as complexing agents for Ni²⁺ cations. Effect of TEA/Ni²⁺ molar ratio on electrodeposition behavior, micromophology, Ni content and corrosion resistance of coatings were studied by means of SEM/EDS, polarization curve and electrochemical impedance spectroscopy (EIS), respectively. It was found that the deposition potential and elecctrochemical impedance of the cathode sample during the electrodeposition was influenced by the TEA/Ni²⁺ molar ratio (TN_mr) in the bath. The deposition potential shifts negatively and the impedance rises with increasing TN_mr up to 2. The nickel content in Zn-Ni deposit was varied in a range from 16.81 to 19.04 wt.%. The dependence of cathodic current efficiency and depositing velocity of the coating on TN_mr of plating bath were also determined. A fine-grained and smooth-faced coating was obtained at TN_mr =2, which exhibited the highest corrosion resistance in 3.5% NaCl environment.