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Chen Z.,Jiangnan University | Luo J.,Jiangnan University | Liang C.,Jiangsu Bree Optronics Co. | Liu J.L.,Jiangnan University
Applied Mechanics and Materials | Year: 2014

PVP/[Sr(NO3)2+Mg(NO3)2+TEOS+Eu(NO3)2+Dy(NO3)2] composite nanofibers were prepared via electrospinning, the effect of different electrospinning parameters on the composite nanofibers' morphology were investigated. The results revealed that diameter of the composite nanofibers increased at first and then decreased with the increasing of voltage, and the properties of the spinning solution (viscosity and surface tension) increased gradually, but the conductivity decreased at first and then increased with the increasing of PVP content. SEM analysis indicated that it's easy to get a good morphological and uniform composite nanofibers when the voltage was 13 ~ 15 kv, inorganic salt content was 5% ~ 6%, and concentration of PVP was 15%. © (2014) Trans Tech Publications, Switzerland.

Wang Q.,Nanjing Southeast University | Dong Y.,Nanjing Southeast University | Shao Q.,Nanjing Southeast University | Teng X.,Jiangsu Bree Optronics Co. | Jiang J.,Nanjing Southeast University
Materials and Design | Year: 2016

In order to improve photoluminescence properties of the Sr2Si5N8:Eu2+ phosphor, Li3N flux was added into the phosphors and the effect of the Li3N flux on the properties was investigated. The results show that, the amount of Li3N flux had a significantly positive effect on the phosphor properties, such as the particle size, activator occupy site in the crystal lattice and luminescent properties. The emitting integrated intensity of Sr2Si5N8:Eu2+ phosphor was increased by 40%, by selecting the appropriate initial compositions and combustion parameters. Moreover, the phosphor with Li3N flux additions, showed improved heat stability. The improved luminescent properties were attributed to the proper grain size and the increasing N3- concentration during firing. © 2016 Elsevier Ltd.

Luo J.,Jiangnan University | Liang C.,Jiangsu Bree Optronics Co. | Gao D.-H.,Jiangnan University | Zhang K.-Y.,Jiangnan University
Advanced Materials Research | Year: 2013

The polypropylene luminescent fiber containing Sr2MgSi2O7: Eu2+, Dy3+ phosphors was prepared by melt-spinning method. Crystal phase structure, spectral features and afterglow properties of the luminescent fiber were tested and analyzed. The results show that the fiber has independent superposition phase features of both Sr2MgSi2O7: Eu2+, Dy3+ and polypropylene; the range of its excitation light wavelength locates among 250~450 nm; it can emit blue light of 460 nm wavelength; its initial luminescent intensity is more than 600 mcd/m2, and afterglow time lasts 7 h; the process of afterglow decay consists of fast stage and slow stage. © (2013) Trans Tech Publications, Switzerland.

Yan J.,Nanjing University | Yu Q.Q.,Jiangsu Bree Optronics Co. | Wu S.,Nanjing University | Shen J.,Nanjing University | Shen J.,Nanjing Normal University
Journal of Thermoplastic Composite Materials | Year: 2014

Monodisperse polystyrene (PS) nanoparticles with a size of 190 nm were first synthesized by emulsion polymerization. Then PS/titanium dioxide (TiO 2; core/shell) nanocomposite particles were prepared by coating TiO2 nanoparticles on the surface of the PS nanoparticles using aqua ammonia/triethanolamine as the positive/negative catalyst pair. Roughness degree of the surface of the shell of the PS/TiO2 nanocomposite particles increased with increasing amounts of aqua ammonia or triethanolamine. Morphology of the surface of the TiO2 shell can be regulated by changing the amounts of aqua ammonia and triethanolamine synchronously. The PS/TiO 2 nanocomposite particles obtained at 2.00 g/0.10 g, 3.00 g/0.20 g and 5.00g/0.40 g of aqua ammonia/triethanolamine showed good morphology of the surface of the TiO2 shell. Roughness on the surface of the TiO 2 shell was remarkably heightened when the reaction temperature of the hydrolysis and condensation process was increased from 50 C to 70 C. © The Author(s) 2012.

Jin H.,Nanjing University | Chen Z.-Y.,CAS Hefei Institutes of Physical Science | Yu Q.-Q.,Jiangsu Bree Optronics Co. | Wu S.-S.,Nanjing University
Journal of Thermoplastic Composite Materials | Year: 2016

The C-O, C=O, and C(=O)O groups were introduced onto high-density polyethylene (HDPE) chains by ultraviolet irradiation in air and the groups' content increased with increase in the irradiation time. When they irradiated for 16 h, gels were formed in the irradiated HDPE, and the content of the gels increased with increase in the irradiation time. Compared with HDPE, the crystal form of the irradiated HDPE did not change and still retained the orthorhombic structure, and its melting temperature decreased, while its crystallinity increased. The irradiated HDPE was added in HDPE/CaCO3 composites as a compatibilizer, and HDPE/irradiated HDPE/CaCO3 composites were obtained. Compared with those in HDPE/CaCO3 composites, the dispersion of the CaCO3 and interfacial interaction between CaCO3 and HDPE matrix in HDPE/irradiated HDPE/CaCO3 composites improved due to compatibilization of the irradiated HDPE, and its mechanical properties (especially impact strength), thus, showed remarkable enhancement. With increase in irradiation time, the tensile strength of HDPE/irradiated HDPE/CaCO3 composites enhanced and its impact strength increased during irradiation time of 16 h and then decreased slightly. In the same irradiation time, the tensile strength and impact strength of HDPE/irradiated HDPE/CaCO3 composites increased with increase in the content of the irradiated HDPE. © 2014 The Author(s).

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