Monodisperse silicon dioxide particles have been prepared by the seed growth method,and different coupling agents were used for modifying these silica particles.The results show that the size deviation of silica parti...Monodisperse silicon dioxide particles have been prepared by the seed growth method,and different coupling agents were used for modifying these silica particles.The results show that the size deviation of silica particles modified with[3 (methacryloyloxy)propyl] trimethoxysilane(KH 570) is much lower than that of silica particles modified with vinyl triethyloxy silane as the coupling agent.In the presence of ethanol and water,styrene may react with silica modified by KH 570 in dispersion polymerization.It was discovered through transmission electron microscopy and energy spectrum that the modified silica particles were successfully encapsulated with polystyrene.The number of silica particles encapsulated with polystyrene was continually decreased with the increase of the size of silica particles.Moreover,the number of silica particles was nearly unity in each SiO 2/PS composite particle when the silica particle size was greater than 410?nm.展开更多
The photoconductive characteristic of the inorganic/organic hybridized polymer system is reported, in which a novel bi-functional photorefractive (PR) poly(N-vinyl)-3-[p-nitrophenylazo]carbazole (PVNPAK) serves as a p...The photoconductive characteristic of the inorganic/organic hybridized polymer system is reported, in which a novel bi-functional photorefractive (PR) poly(N-vinyl)-3-[p-nitrophenylazo]carbazole (PVNPAK) serves as a polymeric charge-transporting and second-order nonliner optical matrix and quantum dots composed of surface passivated cadmium sulfide serve as a charge-generation sensitizer. The hybrid PVNPAK/CdS-nanoparticles polymer composites with different mass ratio of CdS to PVNPAK were prepared. The generation of photocurrent on illumination and photoconductive properties of the PVNPAK/CdS-nanoparticles polymer composites were studied. The results show that the addition of CdS nanoparticle as a photosensitizer can enhance the photoconductivity of the PVNPAK significantly because of the properties of the high quantum efficiency of photosensitization and high charge transport to conducting polymer.展开更多
文摘Monodisperse silicon dioxide particles have been prepared by the seed growth method,and different coupling agents were used for modifying these silica particles.The results show that the size deviation of silica particles modified with[3 (methacryloyloxy)propyl] trimethoxysilane(KH 570) is much lower than that of silica particles modified with vinyl triethyloxy silane as the coupling agent.In the presence of ethanol and water,styrene may react with silica modified by KH 570 in dispersion polymerization.It was discovered through transmission electron microscopy and energy spectrum that the modified silica particles were successfully encapsulated with polystyrene.The number of silica particles encapsulated with polystyrene was continually decreased with the increase of the size of silica particles.Moreover,the number of silica particles was nearly unity in each SiO 2/PS composite particle when the silica particle size was greater than 410?nm.
基金Project(60537050) supported by the National Nature Science Foundation of China Project supported by the Opening Fund of Key Laboratory of Nonferrous Materials and Processing Technology.
文摘The photoconductive characteristic of the inorganic/organic hybridized polymer system is reported, in which a novel bi-functional photorefractive (PR) poly(N-vinyl)-3-[p-nitrophenylazo]carbazole (PVNPAK) serves as a polymeric charge-transporting and second-order nonliner optical matrix and quantum dots composed of surface passivated cadmium sulfide serve as a charge-generation sensitizer. The hybrid PVNPAK/CdS-nanoparticles polymer composites with different mass ratio of CdS to PVNPAK were prepared. The generation of photocurrent on illumination and photoconductive properties of the PVNPAK/CdS-nanoparticles polymer composites were studied. The results show that the addition of CdS nanoparticle as a photosensitizer can enhance the photoconductivity of the PVNPAK significantly because of the properties of the high quantum efficiency of photosensitization and high charge transport to conducting polymer.
