Advanced Materials Research Vol. 709

Abstract: Chemical modification was employed for converting cotton gauze to carboxymethyl cellulose (CMC) gauze by treating them with sodium monochloroacetate and sodium hydroxide. Fourier Transform Infrared spectra (FTIR) were used to characterize the product. The reaction was optimized against temperature, concentration and reaction time for obtaining high degree of conversion. Under optimized conditions, the CMC gauze has a large degree of substitution (DS) of 0.43, and it has shown better moisture absorption ability than that of common cotton gauze.

Abstract: The Ag nanoparticles-Poly(p-aminobenzene sulfonic acid)/graphene modified glassy carbon electrode (AgNPs-PABSA/GR/GCE) was fabricated by electrodepositon of AgNPs-PABSA onto graphene modified glassy carbon electrode (GR/GCE). The reported method was simple and fast. Combining the advantages of GR (high surface area and good conductivity), AgNPs (excellent electronic conductivities) and PABSA (the ability to interact with many components through hydrophobic or π–π electronic interaction), the AgNPs-PABSA/GR modified electrode effectively improved the sensitivity for the determination of rutin.

Abstract: s: The paper extracted the flavor components of Hongdao Clam by using HS-SPME Technique and made an analysis of it by GC-MS. It compared the analysis results of 75 μm Carboxen/PDMS microextraction fibers and 100 μm PDMS microextraction fibers, with the result that the later one was suitable for flavour substance analysis of Hongdao Clam. Besides, by comparing the flavor components of Hongdao clam meat and soup, the thesis reached a conclusion that there are eight common ingredients in them, as well as the type and relative percentage composition of the flavor substance. This research provided a reference for the application of combining SPME and GC-MS techniques in aquatic product processing industry.

Abstract: In this research, the ability of a commercial laccase to decolorize a reactive blue dye was investigated. The influences of operating temperature and pH on the enzymatic decolorization were carefully checked, which indicated the optimal temperature is 40°C and the pH value at 4.0. By monitoring the decolorization of reactive dye, it was found the activity of laccase was affected by various auxiliary chemicals such as common salts, metal ions, chelating agents and surfactants.

Abstract: Reduced graphene oxide (RGO) supported platinum electrocatalyst was successfully synthesized on the glass carbon electrode by the electrodeposition method. Cyclic voltammetry (CV) and amperometry were used to evaluate the catalytic activity of the Pt/RGO modified electrode towards methanol oxidation. The results revealed that the as-prepared catalyst exhibited high electrocatalytic ability in methanol oxidation, which could be attributed to the excellent properties of the reduced graphene oxide as supporting materials.

Abstract: Large area epitaxial graphene (EG) layers are synthesized on 6H-SiC (0001) by annealing at 1500 °C for 5 min in a closed graphite chamber at low vacuum of 10-3 mbar and its 2D band in Raman spectra can be satisfactorily fitted by a single Lorentzian. From Raman spectroscopy, measurements indicate that too high growth temperature is to the disadvantage of the formation of graphene. The results of atomic force microscope (AFM) and field-emission scanning electronic microscope (FE-SEM) reveal the surface morphology of graphene is related with its growth temperature.

Abstract: Polyamide 6 nanotubes array has been prepared using anodic aluminum oxide membrane with only 200 nm pore diameter as the template via a polymer solution wetting method. In this study, we have investigated the morphology of polymer nanotubes array with Scanning Electron Microscope. And we have also investigated the thermal properties of the Polyamide 6 nanotubes with Thermal Gravity Analysis and Differential Scanning Calorimetry, respectively. The Thermal Gravity Analysis and Differential Scanning Calorimetry results indicate that the thermal decomposition temperature of Polyamide 6 nanotubes is higher than that of bulk Polyamide 6(PA6) polymer.

Abstract: H₃PW₆Mo₆O₄₀/SiO₂ was prepared by sol-gel method, and sensitized by H₂O₂ solution. The photocatalytic degradation of methyl violet by H₃PW₆Mo₆O₄₀/SiO₂ under simulated natural light irradiation was investigated. The results demonstrated that at optimal condition (initial concentration of methyl violet is 10 mg/L, and the pH is 2.5, the dosage of catalyst is 0.5% based on feed stocks), the degradation rate of methyl violet is as high as 88.7 % after 2.5h simulated natural light irradiation. The reaction of photocatalysis for methyl violet can be expressed as first-order kinetic model.

Abstract: Dimethylglyoxime (DMG) and N-hydroxyphthalimide (NHPI) were used to catalyze oxidation of toluene to benzoic acid with molecular oxygen under normal pressure in PEG 1000 -based functional dicationic acidic ionic liquid (PEG1000 -DAIL). PEG1000 –DAIL enhanced the efficient catalytic ability of NHPI: 89.82% conversion of toluene with 94.63% selectivity for benzoic acid could be obtained at 80°C in 10 h.

Abstract: Electronic structure and chemical bonding in tetragonal KNbO3 have been studied by first-principles calculations. The band gap is indirect and a value of 1.64 eV was determined. Chemical bonding feature shows that a significant hybridization between Nb 4d and O 2p states. The bonding between K and NbO3 is mainly ionic nature while covalent nature was confirmed between Nb and O.