Advanced Materials Research Vols. 1004-1005

Abstract: The mechanical properties of methyl vinyl silicone rubber foam materials with different cell diameters of the spherical cell structure were investigated. The results showed that the cell diameter had significant effects on the mechanical properties,the foam materials with cell diameter range 300~450μm had the best compression stress property and stress-relaxation property. The changing of cell shape of the spherical cell foam materials in the process of dynamic compression were analyzed by using micro focus uCT technology, with obtaining the parameters of cell volume, porosity and so on.

Abstract: In this study, the monodispersed PS/PtOEP microspheres were successfully synthesized by dispersion polymerization, in which anhydrous ethanol and ultrapure water as dispersing agent, AIBN as an initiator, styrene as monomer, PtOEP as the fluorescent substance. Polystyrene microspheres with the size of the initiator, dispersant, the amount of monomer and so on, and has nothing to do with PtOEP. We can be obviously seen under scanning electron microscope. When in the same content of PtOEP, the particle size of composite microspheres size increases with increasing monomer concentration. When the excitation wavelength was 362nm, the PtOEP peak measured emission spectrum at 720nm. With the increasing size of composite microspheres, the peak fluorescence intensity changes. From the S-V diagram, we observed that the concentration of luminous intensity of composite microspheres monotonously dependent on oxygen, there is a linear correlation between PtOEP in 720nm fluorescence intensity and the concentration of oxygen. This method can be utilized to reliably monitor the content of oxygen in the system.

Abstract: The starch based polymer microspheres were synthesized in the system of the inverse emulsion polymerization. These polymer microspheres were characterized by Scanning Electron Microscope and Grain Size Analyzer. Adsorption behavior of starch based polymer microspheres for Pb²⁺ was investigated by atomic absorption spectrophotometry. The results showed that the average particle diameter of starch based polymer microspheres was about 43.9 μm, and surface of starch microsphere was rough and porous which could be beneficial to form adsorption layer. And the starch based polymer microsphere exhibited good adsorption of lead ions.

Abstract: In this paper, the flame retardant HAS was applied to imparting flame retardance to polyester fabric. The result showed that the flame retardance of polyester fabric improved a lot. The limiting oxygen index increased while the concentration of HAS solution and temperature increased. Whiteness and elastic recovery angle decreased while the concentration of HAS solution increased. Found a good match to the concentration and temperature, the limiting oxygen index could increase to 29% while whiteness and elastic recovery angle kept well.

Abstract: KDP crystals are restrained to grow along (100) direction by a new designed platform. Compared to conventional method, it enables us to grow KDP crystals with higher optical utilization and less labor costs in fabrication process of optical components. The size of the grown crystals is 20×20×10mm³. Its quality has been analyzed by UV-vis spectral, chemical etching and high resolution X-ray diffraction. The FWHM of diffraction curves is 32 and 36 arc s. The transparency measured by UV-vis spectrometer is up to 80%. The results from various characterization studies indicate that the optical quality is almost as same as the conventionally grown crystals.

Abstract: The strain existed in different quantum well structures was analyzed by XRD. By Omega/2Theta scanning,we got the satellite peaks of different samples. Analysis of the samples of these two quantum well about the level strain, vertical strain and the Quartet distortion. By Contrasting the ternary InGaN / GaN MQW samples with the quaternary InGaN/AlInGaN MQW samples,found that the level strain, vertical strain and the quartet distortion of ternary MQW samples are higher than the InGaN / AlInGaN quantum well samples about 0.03%, 0.09 % and 0.12% respectively. Analysis shows that the InGaN/AlInGaN quantum well structure can be better to release their internal stress.

Abstract: Er³⁺-Yb³⁺ co-doped ZnO-B₂O₃- SiO₂-TiO₂ transparent glass ceramics were synthesized by melt crystallization technique. Samples were characterized by DSC, XRD, SEM, UV-Vis-NIR and fluorescence spectra and the factors affecting the crystallization of glass ceramics were analyzed. The results indicated good crystallization property of ZBS glass ceramics. The optimum crystallization temperature was 800°C, and crystallization time was 60 min. The main crystal phase was Zn₂TiO₄ and the transmittance was up to 70% in visible light region. SEM micrograph indicated that the grain diameter was less than 100nm and the emission spectrum of glass ceramics displayed by fluorescence spectra was greatly improved compared with matrix glass. Strong emission peak was observed at 1535nm.

Abstract: Small Angle Neutron Scattering (SANS) technique allows characterizing the nanomicrostructure of the ferritic Oxide Dispersion Strengthened (ODS) steels which are candidates for the structure material of fusion reactor and fast reactor. A SANS study of domestic ferritic ODS alloys are presented. The main objective is to study the evolution of the oxide dispersion nanoparticle during the different stages of the fabrication and different content.

Abstract: Layered organic-inorganic hybrid nanocomposite material with the hydrotalcite-like structure, containing Mg (II),Zn (II) and Al (III) in the layers, and salicylate ions in the interlayer, have been prepared by a simple coprecipitation method (MgAlZn-sal-HTlc). Fluorescence spectrum, XRD and TG were used to characterize the properties of the sample. Additionally, A LED device was fabricated by coating MgAlZn-sal-HTlc onto InGaN-based LED chip. The device emits bright blue light. All the results indicate that blue-emitting fluorescent hydrotalcite-like compound can act as blue components in the fabrication of white LED.

Abstract: The growing necessity of biomaterials has increased the interest in calcium phosphates, particularly hydroxyapatite. In this paper, monodisperse and spherical SiO₂ particles have been coated with Ca₁₀(PO₄)₆(OH)₂:Eu³⁺ layers via a Pechini sol-gel process, resulting in core-chell ctructured SiO₂/Ca₁₀(PO₄)₆(OH)₂:Eu³⁺ samples. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence (PL) spectra were employed to characterize the SiO₂/Ca₁₀(PO₄)₆(OH)₂:Eu³⁺ core-shell particles. The resulted core-shell particles have perfect spherical shape with narrow size distribution, smooth surface and non-agglomeration.