Advanced Materials Research Vol. 937

Abstract: A series of Cu₂O/TiO₂ electrodes for the enzyme-free glucose oxidation have been fabricated by secondary anodic oxidation combined electroplating method. The obtained nanocomposites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and their electrochemical behaviour measured by cyclic voltammetry (CV). The effects of preparation conditions on the morphology and performance of Cu₂O/TiO₂ for enzyme-free oxidaton of glucose were studied. For the electrochemical deposition at the potential range of −0.4 to −0.8 V, Cu²⁺ was electrochemically reduced to polyhedral Cu₂O, accompanied by the simultaneous formation of Cu with a nanoparticle morphology. It was found that the reduced particles with Cu cooperated onto the Cu₂O were completely covered on the top surface of TiO₂ nanotubes and showed a highest response current with a lower overpotential 0.5 V. The results indicate that the incorporation of Cu nanoparticles favors to improve the response current, which might find promising applications in biosensor and biological fuel cells.

Abstract: A crosslinked β-cyclodextrin (β-CD) polymer (PCD) was synthesized by using maleamic acid as a crosslinked agent, and its adsorption behavior for basic fuchsin in aqueous solution was investigated. The adsorption isotherms could be well fitted by the Langmuir adsorption equation. On the basis of the Langmuir analysis, the maximum adsorption capacities were determined to be 33.56 mg·g^-1 at 308K. The kinetics of adsorption followed the pseudo-second-order model.

Abstract: Novel poly (selenophene-co-3-methylthiophene) was successfully achieved by directly electrochemical oxidation of the monomer mixtures of selenophene and 3-methylthiophene (3MeT) in boron trifluoride diethyl etherate. The effect of monomer concentration ratios on the copolymerization were investigated by cyclic voltammetry. The structures of as-prepared copolymers were characterized by UV-vis and infrared spectroscopy. The conductivity and thermoelectric measurements revealed the incorporation of 3MeT into the polyselenophene (PSe) chain improved significantly the conductivity and thermoelectric property of PSe.

Abstract: Four novel cross-linked network conjugated poly (methacrylic acid) functionalized poly (9-aminofluorene) films were prepared by a precursor polymer approach, i.e., poly { poly [ N - (9H-fluoren-9-yl) methacrylamide ] } (P1), poly { poly [ N - (9H-fluoren-9-yl) methacrylamide-co-methacrylic acid ] } (P3), poly { poly [ N - (9H-fluoren-9-yl) methacrylamide] -co-9-aminofluorene } (P2) and poly { poly [ N - (9H-fluoren-9-yl) methacrylamide-co-methacrylic acid ] -co-9-aminofluorene } (P4). As-prepared polymer films had good redox activity and structure stability in concentrated sulfuric acid. Fluorescence spectra indicated that the soluble cross-linked polymers were good blue light emitters and in solid state they were blue-green light emitters.

Abstract: Thick composites made with traditional impregnation and with simultaneous resin infusion from the inside and outside were studied to compare two methods for optimizing permeability, dipping time, and structural organization. Permeability was greater, the dipping time was shorter, the impregnated resin was more uniformly distributed, and blow hole defects were fewer when infusion was performed simultaneously from the inside and outside of the braided structure. The resin flow channel was preset in the precast body, allowing simultaneous outside-in and inside-out dipping.

Abstract: The influence of acetate additives on the mechanism of manganese electrodeposition from chloride-based acidic solution was investigated by electrochemical quartz crystal microbalance and spectroscopic ellipsometry. The EQCM data were represented as plots △m versus E. Because they are not affected by interference from the hydrogen evolution reaction, they clearly show the manganese reduction and oxidation processes. The in situ spectroscopic ellipsometry ( SE) data were analyzed with a single-layer model ( substrate Au - deposition Mn layer) and the thicknesses of Mn layer were obtained by fitting experimental data with the model.Morphology, chemical composition and structure of the manganese deposits were analyzed by scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), and X-ray diffraction (XRD). The results showed that in the absence of acetate additives, Mn (OH)₂ is formed. In the presence of acetate additives, the formation of α-Mn was observed and the deposition rate of Mn electrodeposition on the Au electrode slowed down.

Abstract: The one of technical key of the convergence-divergence nozzle is extend Angle. To use applies continuity equation, momentum equation and Rayleigh-Plesset equation, bubbly liquid through different extend angles of converging-diverging nozzle were simulated. The results show that it is helpful to increase the vibrating width of cavitate bubble when enlarge appropriately the exit taper of nozzle, that is the convergence-divergence nozzle with extended angle is more conducive to cavitation.

Abstract: Salt slurry is the semi-solid waste of the salt industry. The study object was the salt slurry before filter in Jianghan Salt & Chemical Complex. In laboratory, this study investigated the application of the salt slurry in Talimu high density drilling fluid which composed of KCl-saturated brine and polybasic alcohol. It indicates that on the premise of the same density and pH value as the basic drilling fluid recipe, when the salt slurry dosage is less than 500 kg/m³, all the salt slurry application-based recipes measure up both the rheology behavior and the filtrate loss of the drilling fluid. This investigate will reduce the cost of the drilling fluid with the salt slurry as a resource.

Abstract: 2,2-Dimethylol propionic acid was synthesized by two steps using sodium hydroxide as the catalyst in this article. The influence of various factors on the yield of 2,2-Dimethylol propionic acid were studied by single factor experiment that included condensation temperature, condensation time, propionaldehyde-formaldehyde ratioetc.. On the basis of this foundation, the orthogonal design was carried out in order to confirm the preferable synthesis conditions of 2,2-Dimethylolpropanoic. The results show that the optimal synthesis conditions are as follows: condensation time is 8 hours, condensation temperature is 35°C, propionaldehyde-formaldehyde ratio is 2.2, sodium hydroxide-formaldehyde ratio is 0.03, the oxidation temperature is 90°C, oxidation time is 6 hours. The product yield can reach to 71.35% under these reaction conditions that is higher than the value reported in references.