Keggin結(jié)構(gòu)取代型多酸化合物納米結(jié)構(gòu)的研究.pdf

1、東北師范大學碩士學位論文Keggin結(jié)構(gòu)取代型多酸化合物納米結(jié)構(gòu)的研究姓名：潘艷申請學位級別：碩士專業(yè)：無機化學指導教師：龔劍20040501AbstractNanostructuresystemisaimportantfieldwhichderivesfromnanomaterials.Becausethissystemhasmuchfancyphysicalphenomenonandcorrelateswithnanostructu

2、reapparatusinthefuturethepreparationandcharacterizationofthenanostructurebecomeresearchhotspot.Inthisthesisnanoormicrofibersofpolyvinylalcohol(PVA)polyoxometalateswithKegginstructuresubstitutedbydiferentmetalswereprepare

3、d.Bycalciningthefibersdiferentnanostruturcofpurepolyoxometalatesweregoten.Themainresultsareobtainedasfollow:1.PVApolyoxometalateswithKegginstruturesubstitudedbyaluminiumtransitionalmetalorraremetalnanoormicrofibreswerepr

4、eparedbyelectrospinningmethod.MoreoverrelevantpolyoxometafesnanostructureSiWAlnanoflakesSiWgA13nanotubsSiWMn.SiWFeSiWCoSiWNiCe(SiWI)zNd(SiW)ZnanoparticlesandSiWTiSiWCrSiWCunanofibreswereobtainedbycalciningthefibresindife

5、renttemperatures.2.AllproductswerecharacterizedbyIRspectraXraypowderdifraction(XRD)scanningelectronmicroscopy(SEM).TheIRspectrashowthatalltheproductsstillkeepKegginstructure.XRDpaternsshowmostofproductshavingpreferablecr

6、ystalstate.TheSEMphotographsshowthatthenanostructureshapeoftheproductshavechanged.3.Byinvestigatingthediferentexperimentalphenomenonwerationallypresumeandregularlysummarizetheprocessofthenanostructureasfollow:(1)Forthepo

7、lyoxometalatessubstitutedwithtransitionalmetalelementthechangeofthenanostructureshapemaycorrelatewithdorfelectrons.(2)ForthepolyoxometalatessubstitutedwithAltheformationprocessofthenanotubesisdeduced.i.e.fromnanofrbersna