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微波辅助燃烧法制备镁铝尖晶石纳米粉体的研究(英文).docx

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微波辅助燃烧法制备镁铝尖晶石纳米粉体的研究(英文) ResearchonthePreparationofMagnesiumAluminumSpinelNanopowdersbyMicrowave-AssistedCombustionMethod Abstract: Inthisstudy,magnesiumaluminumspinel(MgAl2O4)nanoparticleswerepreparedbythemicrowave-assistedcombustionmethod.Theeffectsofdifferentreactionparameters,suchasthemolarratioofmetalions,combustiontemperature,andmicrowavepower,onthemorphology,structure,andparticlesizeofMgAl2O4nanoparticleswereinvestigated.Theresultsshowedthattheoptimalmolarratioofmetalionswas1:2,andtheoptimalcombustiontemperaturewas600℃withamicrowavepowerof700W,whichledtotheformationofuniform,sphericalMgAl2O4nanoparticleswithanaverageparticlesizeof40nm.ThepossibleformationmechanismofMgAl2O4nanoparticlesbythemicrowave-assistedcombustionmethodwasalsodiscussed.ThesefindingsprovideanewmethodforthepreparationofMgAl2O4nanoparticles,whichhavepotentialapplicationsinhigh-temperature-resistantcoatings,catalysts,andelectronicmaterials. Introduction: Magnesiumaluminumspinel(MgAl2O4)isakindoftypicalceramicmaterialwithahighmeltingpoint,goodchemicalstability,andexcellentmechanicalproperties.MgAl2O4hasbeenwidelyusedincatalysis,refractorymaterials,andhigh-temperature-resistantcoatings.DuetotheexcellentpropertiesofMgAl2O4,thepreparationofnanostructuredMgAl2O4withuniqueoptical,electronic,andmechanicalpropertieshasbecomeahotresearchtopic.DifferentmethodshavebeendevelopedforthepreparationofMgAl2O4nanoparticles,suchassol-gelmethod,hydrothermalmethod,andcombustionmethod.Amongthem,thecombustionmethodisconsideredalow-cost,time-efficientandeco-friendlytechniqueforpreparingnanoparticles,andithasbeenwidelyusedinthesynthesisofvariousnanoparticles. Inrecentyears,microwave-assistedcombustionmethodhasemergedasanoveltechniqueforthepreparationofnanoparticles.Thismethodhastheadvantagesoffastheatingrate,lowheatloss,anduniformheating,whichcaneffectivelycontrolthereactionrateandobtainnanoparticleswithanarrowsizedistribution.However,fewstudieshavebeenconductedonthepreparationofMgAl2O4nanoparticlesbymicrowave-assis