英语翻译
ControllingofmorphologyofNi/Al-LDHsusingmicroemulsionmediated
hydrothermalsynthesis
Abstract.Aquaternarymicroemulsion,cetyltrimethylammoniumbromide(CTAB)/water/n-hexane/nhexanol,
wasselectedforthesynthesisofNi/Al-layereddoublehydroxides(LDHs).Ni/Al-LDHswith
nanowire-,spherical-,rod-andtube-likemorphologieswerepreparedviathemicroemulsion-mediatedhydrothermal
synthesis.TheCTABconcentrationplayedanimportantroleindeterminingthemorphologyofNi/Al-
LDHs.Thestructure,compositionandmorphologyoftheobtainedNi/Al-LDHnanostructureswereinvestigated
byX-raydiffraction,inductivelycoupledplasmaemissionspectroscopy,infraredspectrometerandtransmission
electronmicroscopy.ApossibleformationmechanismofNi/Al-LDHnanostructuresisproposed
1.Introduction
Layereddoublehydroxides(LDHs)areagroupofsynthetic
anionclays,characterizedbytheformula[MII
1–x
MIII
x(OH)2]x+(An–)x/n
.yH2O(whereM=metalandA=
anion)(Cavanietal1991;Bellottoetal1996;Jayashree
etal2002).Theyhavealayeredstructure,withpositively
chargedbrucite-likesheets,whereMII
andMIIIareoctahedrally
coordinated.Theexcesschargeisbalancedby
anionsasCO2
3
–,SO2
4
–,NO–
3situatedintheinterlayer.
LDHsthemselveshaveattractedagreatdealofinterestas
anionexchangers,ionicconductors,andadditivesfor
variouspolymersandotherfunctionalmaterials(Cavani
etal1991;Zhaoetal2003).Mixedoxidesobtainedfrom
theLDHprecursorshavebeenfoundtohaveapplication
asadsorbents,catalysts,andpigments,aswellasusefulness
insensorandmagnetictechnologies(LeeandLee
2002;Zhaoetal2002,2005).Duetotheimportanceof
composition,sizeandmorphologyonthesefunctions,it
isofparticularimportancethatresearchintothenanostructure
oftheLDHsbeperformed.
邮箱： 