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1、Articlewww.acsnano.orgFastResponsiveandControllableLiquidTransportonaMagneticFluid/NanoarrayCompositeInterface†,∥,⊥†††,‡,∥,⊥†,§,⊥DongliangTian,NaZhang,XiZheng,GuangleiHou,YeTian,*YiDu,*LeiJiang,∥,⊥andShiXueDou†KeyLaboratoryofBio-InspiredSmartInterfacialScienceandTechnolog
2、yofMinistryofEducation,BeijingKeyLaboratoryofBio-InspiredEnergyMaterialsandDevices,SchoolofChemistryandEnvironment,BeihangUniversity,Beijing100191,P.R.China‡BeijingNationalLaboratoryforMolecularSciences(BNLMS),KeyLaboratoryofGreenPrinting,InstituteofChemistry,ChineseAcade
3、myofSciences,Beijing100190,P.R.China§LaboratoryofBioinspiredSmartInterfacialScience,TechnicalInstituteofPhysicsandChemistry,ChineseAcademyofSciences,Beijing100190,P.R.China∥InstituteforSuperconductingandElectronicMaterials,AustralianInstituteforInnovativeMaterials,Univers
4、ityofWollongong,InnovationCampus,NorthWollongong,NewSouthWales2500,Australia⊥UOW-BUAAJointResearchCentre,UniversityofWollongong,NorthWollongong,NewSouthWales2500,Australia*SSupportingInformationABSTRACT:Controllableliquidtransportonsurfaceisexpectedtooccurbymanipulatingth
5、egradientofsurfacetension/Laplacepressureandexternalstimuli,whichhasbeenintensivelystudiedonsolidorliquidinterface.However,itstillfaceschallengesofslowresponserate,anduncontrollabletransportspeedanddirection.Here,wedemonstratefastresponsiveandcontrollableliquidtransporton
6、asmartmagneticfluid/nanoarrayinterface,i.e.,acompositeinterface,viamodulationofanexternalmagneticfield.Thewettabilityofthecompositeinterfacetowaterinstantaneouslyrespondstogradientmagneticfieldduetothemagneticallydrivencompositeinterfacegradientroughnesstransitionthattakespl
7、acewithinamillisecond,whichisatleast1orderofmagnitudefasterthanthatofotherresponsivesurfaces.Awaterdropletcanfollowthemotionofthegradientcompositeinterfacestructureasitrespondstothegradientmagneticfieldmotion.Moreover,thewaterdroplettransportdirectioncanbecontrolledbymodul
8、atingthemotiondirectionofthegradientmagneticfield.Thecompositeinterfacecanbeusedasapumpforthetran
