Advanced Materials Research Vols. 785-786

Abstract: The Y complex C₄H₁₀O₁₀Y has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Y atom is coordinated by nine O atoms. The molecular structure stabilized by the O-H…O hydrogen-bonding interactions.

Abstract: A novel Mn metal complex C₁₄H₁₄Mn₂N₂O₁₂ has been synthesized from hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Mn atom is six-coordinated by one N atom and four O atoms. The Mn-Mn bond is existent. The crystal packing is stabilized by O-H...O hydrogen bonding interactions.

Abstract: Carbon nanotubes (CNTs) have aroused widespread attention due to their high potential sorption capability for chemical pollutants. This review summarizes the adsorption mechanisms of organic chemicals and metallic ions with CNTs in aquatic environment and the factors affecting the adsorption. For a better understanding of the mechanism, future research works on combining the chemical experience and molecular dynamics (MD) is recommended.

Abstract: In this paper, vertically aligned ZnO nanorod arrays were synthesized by a simple hydrothermal process. The microstructure, morphology and optical properties of the as-prepared samples were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence spectrum (PL). The results show that the vertically aligned ZnO nanorod arrays are hexagonal wurtzite structures with the high (002)-orientation. At room temperature, the PL measurements illustrate that the as-prepared ZnO nanorod arrays exhibit a strong ultraviolet (UV) emission centered at about 378nm and a broad yellow-green emission centered at about 554 nm. A possible origin of the yellow-green emission of the ZnO nanorod arrays related to the intrinsic defect is proposed.

Abstract: Cellulose nanofibrils as an emerging class of biomaterials have some incomparable advantages in the field of nanocomposite materials. But a challenge associated with using cellulose nanofibrils in composites is the lack of compatibility with hydrophobic polymers and various modification methods have been explored in order to address this hurdle. This review summarizes some previous useful researches about hydrophobic modification of cellulose nanofibrils and also briefly describes their application in various fields.

Abstract: A novel MgO-filled rectangular carbon nanocapsules was fabricated by pyrolyzing acetonitrile with the assistance of MgO and a small quantity of Fe³⁺. The nanocapsules were analyzed by powder X-ray diffraction, transmission electron microscopy, and energy dispersive X-ray spectroscopy. The lengths of the rectangular nanocapsules sides range from 40 nm to 60 nm and the core part of the rectangular carbon nanocapsules consists of cubic phase MgO. A small quantity of Fe catalysts plays an important role in the growth of rectangular carbon nanocapsules.

Abstract: SrWO₄ octahedrons, flowers, bundles, ellipsoids and dendrites had been successfully synthesized via surfactant-assisted method. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photo-luminescent spectra techniques (PL) and fourier transrform infrared spectrometer (FTIR). By through various comparison experiments, it can be found that some related experimental parameters including the reagent concentration, [Sr²⁺]/[WO₄^2-] molar ratio (R), aging temperature and the pH value had great influences on morphology of the products.

Abstract: To prepare and optimize core-shell nanoparticles consisting of poly (methyl methacrylate) (PMMA) with tert-butylhydroperoxide (TBHP) as an initiator. Methods The core-shell nanoparticles consisting of poly (methyl methacrylate) (PMMA) cores surrounded by various of chitosan shells, induced by tert-butylhydroperoxide (TBHP) solution. The average particle diameter and zeta potential of chitosan nanoparticles were determined by Zetasizer nanoanalyzer.Atomic force microscope was used to analyse core-shell nanoparticles morphology . Results The concentrations of chitosan and initiator tert-butylhydroperoxide (TBHP) and amounts of monomer methyl methacrylate (MMA),reaction time were effects on the nanoparticle size and grafting efficiency. The optimal conditions as follows: 0.25g in 47mL 1% acetic acid solution, tert-butylhydroperoxide (TBHP) 0.3mL, methyl methacrylate (MMA) 1g, reaction time 1.5 h and reaction temperature was at 80°C. Conclusion CS-g-PMMA nanoparticles could be successfully prepared by polymerizing MMA onto CS using tert-butylhydroperoxide as an initiator.

Abstract: Li⁺-doped nanoTiO₂ particles with various amounts of dopant Li⁺ irons have been synthesized by a sol-gel process. The products were characterized by XRD and SEM.Which revealed that the crystal structure of Li⁺-doped nanoTiO₂ is anatase, and the nanoparticles diameter was 42nm. Five factous, including dosage of Li⁺-doped nanoTiO₂, initial concentration of diesel, pH value , photocatalytic degradetion reaction time and the presence of H₂O₂, are considered in the diesel degradation experiments. The results manifest that Li⁺-doped nanoTiO₂ can be used as photocatalyst to removal diesel pollutants in seawater effectively. When the ratio of Li⁺ doped into TiO₂ is 1%wt, the calcination temperature of Li-doped nanoTiO₂ is 500°C, the dosage of the Li⁺-doped nanometer TiO₂ is 0.4g/L, the initial concentration of diesel is 0.2g/L, pH value is 7.0, the reaction time is 2.5h and the H₂O₂ dosage is 0.2g/L, the removal rate of diesel pollutants is up to 88.10%.

Abstract: A liquid-free approach was developed to align carbon nanotubes (CNTs) bundles composed of oriented CNTs. Electrostatic field was applied to the CNTs bundles at ambient environment. The proper dispersion and alignment of CNTs bundles was confirmed by scanning electron microscopy (SEM). Vertically alignment feature of CNTs bundles with one end embedded in film substrate could be observed. An analysis of the polarization-driven force between electrodes is considered to explain the CNTs bundles aligning process.