Advanced Materials Research Vols. 535-537

Abstract: Bacterial cellulose (BC)/ Polymethylmethacrylate (PMMA) nanocomposite was prepared by immersing regenerated BC membrane (RBC) in PMMA aqueous solution followed by oven-drying process. The regenerated membrane was obtained through a simple approach by phase inversion method using bacterial cellulose and lithium chloride（LiCl）/dimethylacetamide（DMAc）as solvent. The structure of the membrane was investigated by the scanning electron microscopy (SEM). It shows very smooth, dense and homogeneous surface but owing layer structure. Tensile test results indicate that BC/PMMA nanocomposite has higher tensile strength compared with neat PMMA sheet. After dipping treatment, its light transmission could attaining 89.4%. Consequently, the obtained RBC/PMMA nanocomposite may be potentially used as the substrate of flexible Organic Light Emitting Diode (OLED) and packaging meterials.

Abstract: In this study, a mental matrix composite (MMC) made of Mg-3Zn-0.8Zr alloy as a matrix and β-TCP particles as reinforcements were prepared for investigating the effect of β-TCP spherical particles sized in 100 nm on the microstructure of that alloy. The grains of as-cast or as-extruded Mg alloys systematically decreased from about 80 μm to about 30 μm with the choice of β-TCP contents. X-ray diffraction (XRD) analysis and optical microscopy (OM) observations show that the Mg-3Zn-0.8Zr-β-TCP (1.0 or 1.5, in wt %) composites were composed of various phases in addition to Mg and MgZn₂ comparied with Mg-Zn-Zr alloy. New diffraction peaks appearing in the MMC, which suggests that a potential interaction occurred between β-TCP and the matrix. Transmission electron microscopy (TEM) images reveal that secondary phases, which wraps upon the surface of β-TCP, are uniformly distributed in the grains of Mg-Zn-Zr alloy. Energy spectrum analysis shows that the component of dark-colored parts is equivalent to β-TCP, but the component of light-colored parts is Mg-Zn-Ca, which demonstrates that there is a real interaction occurred between the matrix and β-TCP.

Abstract: CdS Nanorods have been successfully prepared by hydrothermal synthesis technology by using cadmium nitrate and thiourea as the raw material,by using diethylene triamine as the template agent. The samples were characterized by the technique of XRD、TEM and SEM. The results indicated that the products were pure hexagonal CdS. This paper also used the samples as photocatalysts to study the degradation the solution of methyl orange. The concentration of methyl orange was unchanged during the process of experiment. We also investigated the effect of the amount of catalyst, and pH of the solution on the degradation rate of methyl orange. The experimental results showed that methyl orange degradation rate reached 90% with the amount of catalyst 0.020 g, solution pH of 3.5 and UV irradiation 120 min.

Abstract: The technology of using diisopropylamine as a replaced drying solvent preparing for nano material has been studied．The products of Al（OH）3 and SiO2 are found to be amorphous aerogel

Abstract: Abstract: Objective To separate and enrich compounds from Apocynum venetum L. leaves. Methods The core-shell nanoparticles consisting of poly (methyl methacrylate) (PMMA) cores surrounded by various chitosan shells, induced by a tert-butylhydroperoxide (TBHP) solution. And core-shell nanoparticles was applied to immobilize Alpha glycosidase enzymes. Some compound from the extrat of Apocynum venetum L. leaves were absorbed by the immobilized Alpha glycosidase enzymes. and the components absorbed were detected by HPLC. Results Hyperoside and trifolin can be adsorbed by the nanoparticles immobilized Alpha glycosidase enzymes. Conclusion The method applied to separate and preconcentrate Apocynum leaves’ active ingredients is feasible.

Abstract: A series of Cu/Cr nanocomposite oxides (Cu/Cr–NCOs) were prepared by Cu/Cr hydrotalcite precursors. Their catalytic activities on thermal decomposition of ammonium perchlorate (AP) were investigated by differential thermal analysis (DTA). The results show that Cu/Cr–NCOs are efficient in enhancing thermal decomposition of AP. With 4 wt. % addition of 500 °C calcined Cu2Cr–NCOs, the thermal decomposition process of AP can be accelerated by 107 °C. Cu/Cr–NCOs catalysts have better effect compared to mechanical mixture of CuO and Cr2O3 catalyst. Their catalytic mechanism was also discussed.

Abstract: Different morphology CuO nanostructures, including platelets, flower-like were simply synthesized at 350 °C controlled by droplet on hydrophobic substrate. This is a simple method which does not require any template, catalyst, or surfactant but can control the morphology of CuO from platelets to flowerlike. The morphologies are strongly dependent on the volume of droplet. Scanning electron microscopy (SEM), Optical microscope and X-ray diffraction (XRD) were used to observe the morphology, crystallinity, and chemical composition of the CuO structures. Growth mechanisms for shape selective CuO synthesis were proposed based on these results.

Abstract: The article presents the results of physico-chemical studies on the development of nanostructured carbon materials from domestic raw materials. Were obtained and tested micro-mesoporous carbon sorbents for molecular-sieve chromatography of markers and investigated the applicability of carbon sorbents for the separation of protein-lipid complex, and plant bio-stimulator.

Abstract: Crystalline selenium nanostructures were synthesized from the reaction of a GeSe3 glass with water at 85°C for 144 hours. The hydrolysis of the Ge-Se bonds releases Se fragments in the solution where they form a colloidal suspension of amorphous nanospheres. The later evolve toward a more stable hexagonal phase (trigonal) leading to the anisotropic growth of one-dimensional monocrystalline structures. Filaments, bars and tubes of monocrystalline trigonal selenium were obtained with diameters ranging from 10 nm to 1 µm and aspect ratio up to 180. This simple process in aqueous solution opens new perspectives for the synthesis of 1D nanoparticles of trigonal selenium at large scale.

Abstract: Polystyrene/SiO2/NiFe2O4 magnetic microspheres were prepared by emulsion polymerization using NiFe2O4 nanoparticles as magnetic carriers, styrene and tetraethoxysilane as raw materials, and 3-Methacryloxypropyltrimethoxysilane as a cross-linking agent. Co-Ce codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres material were prepared by sol-gel process with tetrabutyl titanate as raw materials，Co and Ce as doping ions, PS-SiO2/NiFe2O4 particles as the cores, sodium dodecyl sulfate and polyvinylpyrrolidone as templates. The crystal structure and surface morphology of Co-Ce Codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres were characterized by vibrating sample magnetometer(VSM)，X-ray diffraction(XRD)，scanning electron microcopy(SEM)，UV-Vis diffuse reflectance spectroscopy( DRS) and temperature programmed desorption of oxygen(TPD). The results indicated that Co-Ce codoped TiO2/SiO2/NiFe2O4 particles were mesoporous microspheres with core-shell structure. The red shift of the absorption spectrum of Co-Ce codoped TiO2/SiO2/NiFe2O4 was observed by Co-Ce codoping, which enlarge the photoresponse range and surface oxygen storage of TiO2.