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1、PublishedonWeb03/18/2006Synthesis,AnionExchange,andDelaminationofCo-AlLayeredDoubleHydroxide:AssemblyoftheExfoliatedNanosheet/PolyanionCompositeFilmsandMagneto-OpticalStudiesZhaopingLiu,RenzhiMa,MinoruOsada,NobuoIyi,YasuoEbina,KazunoriTakada,andTakayoshiSasaki*ContributionfromtheAdVancedMat
2、erialsLaboratory,NationalInstituteforMaterialsScience(NIMS),1-1Namiki,Tsukuba,Ibaraki305-0044,JapanReceivedDecember22,2005;E-mail:sasaki.takayoshi@nims.go.jpAbstract:Thispaperdescribesasystematicstudyonthesynthesis,anionexchange,anddelaminationofCo-Allayereddoublehydroxide(LDH),withtheaimof
3、achievingfabricationandclarifyingthepropertiesofLDHnanosheet/polyanioncompositefilms.Co-Al-CO3LDHhexagonalplateletsof4íminlateralsizeweresynthesizedbytheureamethodunderoptimizedreactionconditions.Theas-preparedCO32--LDHwasconvertedtoCl--LDHbytreatingwithaNaCl-HClmixedsolution,retainingitshi
4、ghcrystallinityandhexagonalplatelikemorphology.LDHsintercalatedwithavarietyofanions(suchasNO--3,ClO4,acetate,lactate,dodecylsulfate,andoleate)werefurtherpreparedfromCl--LDHviaananion-exchangeprocessemployingcorrespondingsalts.Exchangedproductsinvariousanionformswerefoundtoshowdifferentdelam
5、inationbehaviorsinformamide.Amongthem,bestresultswereobservedforNO3--LDHintermsoftheexfoliatingdegreeandthequalityoftheexfoliatednanosheets.Thedelaminationgaveapinktransparentsuspensioncontainingwell-definednanosheetswithlateralsizesofupto2ím.Theresultingnanosheetswereassembledlayer-by-laye
6、rwithananionicpolymer,poly(sodiumstyrene4-sulfonate)(PSS),ontoquartzglasssubstratestoproducecompositefilms.Magneticcirculardichroism(MCD)measurementsrevealedthattheassembledmultilayerfilmsexhibitedaninterestingmagneto-opticalresponse.Introductiontroactiveandphotoactivematerials,7andsoon.How
7、ever,manyoftheapplicationsarelargelyrestrictedduetotheinaccessibilityLayereddoublehydroxides(LDHs),alsoknownasanionictotheinnersurfacesofthehostlayers.Themosteffectiveorhydrotalcite-likeclays,areaclassoflamellarcompoundssolutiontothisproblemmaybedelamina
