Advanced Materials Research Vols. 535-537

Abstract: The composition of nano Bi2WO6 and graphine is manufactured and its structure are characterized by fhotoluminescence and electrochemical impedance in this paper, and their photocatalytic degradation function are compared to methanal and urea solution, respectively. The results show that: the composition of nano Bi2WO6 and graphine has the highest photocatalytic degradation efficiency than Bi2WO6, and it is a good photocatalyst of removing ammonia nitrogen and reducing COD.

Abstract: PbWO₄ nano- and macrostructures have been successfully synthesized via solvothermal method and a facile microwave irradiation method. The products were characterized by X-ray diffraction (XRD) pattern and field emission scanning electron microscopy (FESEM). By controlling experimental parameters including the CTAB concentration and the kind of solvent, different morphologies of PbWO₄ nano- and macrostructures can be obtained.

Abstract: The chitosan/modified nano-TiO₂ composited antibacterial was prepared by hydrothermal method in this paper. The effects of reaction time and temperature, different kinds of alkali concentration on the reaction function of chitosan and nano-TiO₂ were studied. Anionic surfactants were used for surface modification of nano-TiO₂ and the composite reaction conditions of chitosan/modified nano-TiO₂ were studied preliminarily. The chitosan/modified nano-TiO₂ composite antibacterial was characterized by Fourier transform infrared spectroscopy (FTIR). The results showed that: under the conditions of the hydrothermal reaction (2mol/L NaOH, 120°C, 8h), the hydrogen bonds were formed between nano-TiO₂ modified by SDBS and the chitosan molecules The different reaction conditions of nano-TiO₂ were characterized by X-ray diffraction (XRD). The results showed that: nano-TiO₂ can be fairly good activated under the conditions of the hydrothermal reaction: 1mol/L NaOH, 120°C, 14h.

Abstract: The precursor of Co₃O₄ nanometer particles is synthesized through settles under given conditions. The decomposition process of the precipitate is studies by TGA and XRD. The results indicate that the precipitate is amorphous. With the temperature increasing the precursor firstly loses its free water and structure water. Then the precursor decomposes into Co₃O₄ nanometer particles at 321°C and change into CoO nanometer particles at 920°C.As the firing temperature and time increasing, the crystal transformation tends perfectly.

Abstract: PU/ hydrogel composites or it containing fibroblast growth factor-2 (FGF-2) composites had been prepared by γ-ray radiation or room temperature(T) method in this paper. We utilized nanosized clay solution, thermosensitive N-isopropyl acrylamide (NIPAAm), Polyurethane (PU), and acrylic acid (AAc) as the starting materials to synthesize PU/hydrogel nanocomposite products. The dipping and weighing tests, Material Testing Machine (LLOYD) were employed to analyze the physical and mechanical properties differentially. In addition, the drug release and the wound closure in animal experiments were also finished by Enzyme-link immunosorbent assay( ELISA) reader and magnifier for five groups of treatment dressings. From the experimental results, we distinctly obtained that animal tests of the PU/hydrogel composite incorporating FGF-2 as a wound dressing was able to effectively interact with the wound in a suitable moist healing environment. From the results, we also gained that these composites make themselves more compatible with skin.

Abstract: In this work, 3-dimensional flower-like Y2O3:Eu3+ microstructures were synthesized through a facile route using simple hydrothermal reaction and sequentially calcinations without templates or matrix. The flower-like micro-architectures are self-assembled by nanosheets with thickness of about 50 nm and diameter about 3-5 μm, which were verified by the field-emission electron microscopy (FESEM) and transmission electron microscope (TEM). The as-synthesized Y2O3:Eu3+ samples show a strong red emission due to 5D0-7F2 transition (612nm), suggesting potential applications in red phosphors.

Abstract: Fluorinated silica nanoparticles (FSNs) were synthesized by the hydrolysis of tetraethyl orthosilicate and fluoroalkyl siloxane, and by the assistance of surfactant of cetyltriammonium bromide (CTAB) under basic condition. Through adjusting the synthesis conditions, the better particles distribution of fluorinated silica could be obtained. Then the FSNs were used to prepare liquid marble with water and the stability of the liquid marble was tested to investigate the wetting prevention ability of the fluorinated silica nanoparticles.

Abstract: The silica sol containing epoxy groups was prepared with tetraethoxysilane and silane coupling agent GPTMS as precursors by sol-gel technique and was used to encapsulate the microencapsulated flame retardant to enhance its flame retarding efficiency and water fastness for textile material. The prepared silica sol and gel were characterized by nano particle size analyzer, FT-IR spectrum analysis, energy spectrum analysis and SEM. The experimental results were proved that silica gel containing epoxy group was assuredly deposited on the surface of microencapsulated flame retardant. The cotton fabric was finished by the modified flame retardant and the test results (including the test of flame spread properties of textiles in vertical direction and the fastness to washing) showed that it had better flame retarding efficiency and water fastness.

Abstract: The nanoparticles additives have very excellent abrasion resistance. In this paper, we study the tribological properties of the nanoparticles additives, and discusses the preparation methods of the nanoparticles and concludes the special nature of the nanoparticles additives in the lubricant through several visible tests. This paper makes a detailed analysis of the friction characteristics of the nanoparticles additives.

Abstract: In this paper, Palladium nanoparticles were electrodeposited on the surface of glassy carbon electrodes by more circles cyclic voltammetry method and Palladium nanoparticles modified electrode (Pd/GCE) was obtained. Morphology and crystal structure of nanoparticles were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The performance and electrochemical process of catalytic oxidation methanol were measured and analyzed by cyclic voltammetry (CV), chronoamperometric curves (i-t) and alternating current impedance spectra (AC impedance) in KOH solution. The results showed that catalytic activity of Pd nanoparticles modified electrode for methanol was over 30 times higher than that of the plate Pd electrode, and catalytic performance was good. In addition, the catalytic oxidation was mainly diffusion-controlled process.