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Janus微纳米纤维膜的制备及应用研究.docx

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Janus微纳米纤维膜的制备及应用研究 Introduction: Inrecentyears,Janusmicro/nano-fibrousmembraneshavegainedsignificantattentionduetotheiruniquepropertiesandpotentialapplicationsinvariousfields.TheJanusstructure,whichreferstotheasymmetricarrangementofmultiplefunctionalgroupsormaterialsonasinglesubstrate,offersawiderangeofpossibilitiesfortailoredpropertiesandapplications.ThisarticleaimstoprovideanoverviewofthepreparationmethodsandapplicationsofJanusmicro/nano-fibrousmembranes. Preparationmethods: 1.Electrospinning: Electrospinningisawidelyusedtechniqueforfabricatingmicro/nano-fibrousmembranes.Itinvolvestheuseofhighvoltagetogenerateanelectricallychargedjetofpolymersolutionormelt,whichisthencollectedontoarotatingdrumorflatcollector.Bymodifyingthecollectordesignorusingmultiplecollectors,aJanusstructurecanbeachievedonthefibersurface.Forexample,adual-spinneretelectrospinningsetupcanbeusedtodepositdifferentmaterialssimultaneously,formingJanusfiberswithdistinctpropertiesonbothsides. 2.Template-assistedmethods: Template-assistedmethodsinvolvetheuseoftemplatesormoldstoguidethedepositionofmaterialsontospecificregionsofthefibrousmembrane.Onesuchmethodisthecolloidallithographytechnique,wheremonolayersofcolloidalparticlesareself-assembledonthesubstratesurfacebeforeelectrospinning.Theparticlesactasamask,preventingmaterialdepositionintheareastheycover.Afterelectrospinning,theparticlescanberemoved,leavingbehindaJanusfibrousmembranewithdifferentsurfaceproperties. 3.Selectivesurfacemodification: Selectivesurfacemodificationtechniquesinvolvethemodificationofonlyonesideofthefibrousmembranewhileleavingtheothersideintact.Thiscanbeachievedthroughvariousmethods,suchaschemicalvapordeposition,plasmatreatment,ordirectinkjetprinting.Forexample,inkjetprintingoffunctionalmaterialsontothesurfaceofafibrousmembranecancreateaJanusstructurewithdifferentfunctionalitiesoneachside. Applications: 1.Filtration: Janusmicro/nano-fibrousmembranesshowgreatpotentialforvariousfiltrationapplications.Theasymmetricstructureallowsfor