Advanced Materials Research Vols. 785-786

Abstract: The Electroluminescence (EL) characteristics of a novel yellow emitting material (DPIHQZn) were investigated in this paper. The results demonstrated the DPIHQZn with strong emitting and hole-transporting ability. Based on the performance,a series of doping yellow organic light-emitting diodes were fabricated.The yellow devices were fabricated as follows: ITO/ 2T-NATA(40 nm)/NPB(10 nm)/Alq:x%DPIHQZn (35 nm)/Alq (35 nm)/LiF(5 nm)/ Al,x=1,2,3,5;the maximum luminance was 3180 cd/m²at an applied voltage of 15V,while the Commission International de LEclairage coordinates was (0.40,0.48).

Abstract: For studies of the magnetic characterization of materials with weak magnetism signals, an improved magnetic correction method is proposed to subtract the signal arising from the substrate. The magnetic moment error arising from fitting the data and the system measurement error have been calculated. The influence of nonlinear M-H curves for the substrates has been analyzed and compared with the traditional method of subtracting the substrate signal. Standards determining the presence of ferromagnetism in materials with weak magnetism signals are suggested. The improved magnetic correction method provides a criterion for clarifying confusion in the characterization of materials with weak magnetism signals.

Abstract: Far-infrared fiber can promote blood circulation, accelerate microcirculation and thermal insulation.It also has a very strong effect for health care. In view of these functions, far-infrared fiber has industrialization, and widely used in clothing, bedding. But it has no unified method for far-infrared fiber qualitative analysis. This paper briefly describes the basic content of the Near-infrared Spectroscopy technology.Use Shanghai Lengguang S400 near-infrared quality analyzer , using Near-infrared spectroscopy technology and using PLA method to establish the far-infrared polypropylene qualitative model and the far-infrared polyester qualitative model.This method can rapidly and accurately to do qualitative analysis of far-infrared fiber.

Abstract: To get bioorganic surface with improving biological properties, NiTi shape memory alloy was bonded poly (ethylene glycol) (PEG) by sequentially piranha solution treating, silanizing, and then γ-ray irradiation induced grafting. Piranha solution treating gave hydroxylated surfaces for the benefit of next silanization. The trichlorovinylsilane (TCVS) was performed as a bridge to covalent bond treated NiTi substrates and PEG by γ-irradiation. X-ray photoelectron spectroscopy (XPS) was used to indicate that PEG was bonded on silanized NiTi surface by irradiation. Osteoblast culture of 1 day and methyl-thiazol-tetrazolium (MTT) assay showed that PEG bonded on NiTi surface enhanced cell proliferation and cell amount increased significantly with increasing the concentration of bonded PEG.

Abstract: Ni-doped ZnO diluted magnetic semiconductors nanorods were successfully synthesized by hydrothermal method. The crystal structure, morphology, constituent elements and optical proprety of the products using this method were investigated via X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray energy dispersive spectrometry (XEDS) and ultraviolet-visible spectroscopy (UV-vis). The experiment results show that the morphology of samples were nanorods with good dispersion, all the diffraction peaks correspond to the wurtzite structure hexagonal phase, no other impurity phase appeare, and the Ni²⁺ ions successfully substituted for the lattice site and generate single-phase Zn_1-xNi_xO. The band gap increases firstly and reduces afterward with the increase of Ni²⁺contents.

Abstract: This study outlines the influencing factors of the conductive properties for carbon black filled conductive silicone rubber. The conductive silicone rubber has been prepared. Researched on composite materials' conductive properties with different biomass and variety means by adding different conductive properties of carbon black and nanomodified materials. The results show that the combination of carbon black can improve the conductive properties of the composite material. Silica added can affect the conductive properties. Modified the materials appropriately can effectively improve the electrical properties of the material.

Abstract: Ag/TiO₂/Eu-MCM composite was prepared by a nanofilm of silver coating on a nanofilm of anatase TiO_2­ assembled onto the internal and external pore surface of a hierarchical micro/meso/macroporous molecular sieve Eu-MCM. The composites Ag/TiO₂/Eu-MCM exhibited significant photocatalytic characteristics with more than four times higher UV-Vis-induced catalytic degradation for phenol than that of pure TiO₂. The result is attributed to the composites possess vast specific surface areas, big pore width in favor of mass transfer, strong absorbance of nanofilm silver to UV-Vis light, rapid photoelectron transfer from excited nanofilm of TiO₂ to silver nanofilm, and reduction of the recombination probability of hole and photoelectron. There exists an excellent linear correlation with a correlation coefficient 0.979 between photocatalysis and fluorescence of the composite. A photocatalytic intermediate benzoquinone was measured using HPLC techniques during the process of photocatalytic degradation phenol under a weak UV-Vis radiation condition that indicated organic phenol was first oxidized into benzoquinone and finally degraded into inorganic species of carbon dioxide and water.

Abstract: The electromagnetic nanocomposites with a core-shell structure are synthesized by in situ chemical oxidative polymerization. The Co doped Fe₃O₄ magnetic particles (Co-Fe₃O₄) act as the core and poly (3,4-ethylenedioxythiophene)-poly (sodium-p-styrenesulfonate) (PEDOT-PSS) as the conductive polymer shells. The morphology, structure, crystallinity, conductive and magnetic properties were studied by transmission electron microscopy (TEM), Scanning electron Microscope (SEM), Fourier Transform Infrared (FTIR) spectroscopy, powder X-ray diffraction (XRD), four-probe conductivity meter and vibrating sample magnetometer (VSM). It is found that the core-shell nanocomposites exhibit controllable electromagnetic properties by adjusting the molar ratio of Co-Fe₃O₄ to EDOT monomer.

Abstract: A novel solid-solid phase change materials was synthesized by the two-step condensation reaction of polyethylene glycol (PEG1000), neopentyl glycol (NPG) and 4, 4-diphenylmethane diisocyanate (MDI). Polyethylene glycol (PEG1000) was used as soft segment and 4, 4-diphenylmethane diisocyanate (MDI) as hard segment. The composition, structure and phase change properties were characterized by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), thermogravimetric analyzer (TGA), polarization optical microscopy (POM) respectively. The results indicated that the PCM appeared typical solid-solid phase transition property and the phase change enthalpy and phase transition temperature reached to 120.45 J/g and 37.32°C, respectively.

Abstract: Monodisperse porous polystyrene microspheres were prepared with the mixed solution of ethanol and water as dispersion medium and poly (vinylpyrrolidone) was used as dispersant. The even size of microspheres prepared at optimal process was about 1μm. Photochromic microspheres were obtained using polystyrene microspheres to absorb the photochromic materials. The effect of dispersion medium on the microspheres morphology was investigated. The adsorption parameters affecting microspheres adsorption quantity, such as the concentration of spiropyran solution and adsorption temperature, were studied in detail. Furthermore, photochromic properties of the microspheres were analyzed and PVA as coating was used to increase the fatigue resistance of photochromic microcapsules. The photochromic microspheres obtained could rapid reversibly change color under UV or sun light at room temperature and common pressure.