Synthesis And Property Research Of Magneticmetal Nanocomposite Metarials

In resent years, nanocomposite materials with much particular properties such asoptics, electricity, sound, heat and magnetism have aroused more and more interestfrom people. Nanocomposite materials have much more important significance indegradation of organic pollutant, purity of environment, and exploration of newenergy etc. Furthermore, synthesis of novel functional nanocomposite materialspossesses value of theoretical studies and is a sigficant topic with comprehensiveapplied prospect. Arouding the preparation and studies on the related properties ofnovel nanocomposite materials, the main contents of this article are listed as follows:1. Three dimensional （3D） Ag/-Ni（OH）₂flower microspheres were synthesizedthrough a facile hydrothermal method in the presence of L-arginine. The resultssuggest that this biomolecule-assisted hydrothermal method is an efficient route forthe fabrication of Ag/-Ni（OH）₂flower microspheres by using L-arginine as both ashape controller and a reducing agent of silver ions. The as-synthesized products werecharacterized by X-ray power diffraction （XRD）, scanning electron microscopy（SEM）, transmission electron microscopy （TEM） and energy-dispersive X-rayspectroscopy （EDS）. The photocatalytical activity of the Ag/-Ni（OH）₂flowermicrospheres was also investigated by UV–Vis spectrophotometer. And the resultsdisplay enhanced photocatalytic activity in degradation of methylene blue.2. The-Ni（OH）₂microspheres have been fabricated by a facile hydrothermal methodin the assistance of biomolecule （L-arginine）. The NiO microspheres were obtainedwith further calcination of-Ni（OH）₂precursor at500oC for2h. Subsequently,Ag/NiO nanocomposite microspheres were also prepared by the reduction of AgNO₃solution. The photocatalytic activity of Ag/NiO composite microspheres was alsoinvestigated by UV–Vis spectrophotometer. And the results display enhancedphotocatalytic activity in degradation of methyl orange.3. The stoichiometric FeNi₃alloyed microchains were successfully synthesized via asimple hydrothermal method without surfactants or external magnetic fields. Theeffect of synthetic parameters, including citrate concentration, the reactant molar ratio and reaction time, on the formation and morphologies of the FeNi₃assemblies wereinvestigated. Furthermore, magnetic measurements by superconducting quantuminterference device were also carried out to explore their magnetic properties, whichconfirmed that the as-prepared samples had the symmetric hysteresis loop behavior offerromagnetic materials.4. The long flake-like Co（II）-Phenylalanine and sphere-like Fe（II）-Phenylalaninecomplexes were successfully synthesized by a refluxing method. The reaction timeplays the key role during the whole process of the Metal-Phenylalanine complexesgrowth. The intensity of the peaks of metal-Phenylalanine in photoluminscencespectra increased twice or more compared with that of pure Phenylalanine. Thissynthesis approach is expected to become an appropriate method for preparation ofother Metal-organism complexes.