Study On Preparation And Properties Of Cs-Co-Fe PBA Magnetic Nanomaterials By Surfactant Temple Method

In recent years, the preparation and application of cobalt-iron Prussian blue analogues(PBA) containing alkali ions have been the hot in the studies of materials, but unfortunately, the preparation and magnetic study on their nanomaterials are rather scarce. To prepare nanomaterials by surfactant template method is a valuable new way because the size and morphology of products can be controlled artificially. Herein, the dissertation gives emphasis to the synthesis of Prussian blue analogues containing cesium ion by surfactant temple method (Microemulsion, Micelle and Liquid Crystal). The products were characterized by EDS,CHN,TEM,SEM,XRD,IR,UV-Vis,TGA and SQUID etc. The results are shown in the following sections:1. Spherical and cubic nanoparticles of cobalt-iron Prussian blue analogues which contain cesium ions were synthesized in polyoxyethylene tertoctylphenyl ether (Triton X-100)/n-hexanol/cyclohexane/water reverse microemulsion system. The effects of w (the molar ratio of water to surfactant), reaction temperature and oil concentration on the morphology of products were studied. The composition and structure of product were analyzed by EDS,XRD,IR,UV-Vis,TGA and SQUID were exploited to characterize the magnetic properties.2. Tubular, consisting of cubic nanoparticles, of cobalt-iron Prussian blue analogues containing cesium ions were synthesized in cetanyl trimethyl ammonium bromide (CTAB)/ethanol/water in the low temperature by micelle method. The effects of w, reaction temperature and the concentration ratios of reactants on the morphology of products were studied. To the best of our knowledge the synthesis of tubular cobalt-iron PBA nanocrystals have not been reported previously by the surfactant template method. TEM and SEM were employed to examine the formation mechanism of the tubular cobalt-iron PBA.3. Nanothorns and tubular of cobalt-iron Prussian blue analogues containing cesium ions were synthesized in cetanyl trimethyl ammonium bromide (CTAB)/ ethanol/water micelle system. As far as we know, the synthesis of nanothorns and tubular cobalt-iron PBA nanocrystals were the first reported by surfactant template method. The effects of the concentration of surfactants(C(CTAB)), reaction temperature and the volume-mass ratios of alcohol to water(V(ethanol)/m(water)) on the morphology of products were studied. The composition and structure of product were analyzed by EDS,XRD,IR,UV-Vis,TGA and SQUID were exploited to characterize the generation of magnetic properties.4. Cobalt-iron Prussian blue analogues containing cesium ions were synthesized by other surfactant template method (Bicontinuous Phase and the Liquid Crystal method).10-20 nm spherical and quasisphere of cobalt-iron Prussian blue analogues were synthesized in Bicontinuous Phase; 10-30 nm irregular nanoparticles were synthesized by Liquid Crystal method.