High quality BaWO4 nanowire bundles have been synthesized in toluene-sodium dodecylbenzene sulphonate (SDBS)-small amount PEG20000-H2O reverse micelle system. XRD result shows that the obtained BaWO4 belongs to tetragonal phase with scheelite structure. TEM results demonstrate that the obtained BaWO4 nanowire bundles have high aspect-ratio (>650). The experimental results confirm that PEG20000 plays a key role for the formation of BaWO4 nanowire bundles. Other factors which influence the morphology and crystallinity of the product are also briefly discussed. Moreover, the obtained BaWO4 nanowire bundles exhibit strong photoluminescence centered at 397.3 nm with λex=343.5 nm at room temperature, which is different from the bulk BaWO4 crystals.
Fe3O4 nanoparticles were prepared by chemical co-precipitation using palmitic acid as surfactant,then a uniformly dispersed system of Fe3O4@Polymethylmethacrylates(PMMA) core-shell structure was obtained.Furtherm-ore,polymethylmethacrylates(PNIPAM) was encapsulated on the surface of the Fe3O4@PMMA core-shell nano-structure to get Fe3O4@PMMA@PNIPAM double shell-core composite structure.After that,the Ag nano-particles were assembled on the surface of Fe3O4@PMMA@PNIPAM taking advantage of coordination reaction between Ag+ and nitrogen atom on the amide group of PNIPAM.The magnetism of composites is convenient for the catalyst separation from the solution.
