Cerium oxide nanoparticles prepared in self-assembled systems

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1、AdvancesinColloidandInterfaceScience147–148(2009)56–66ContentslistsavailableatScienceDirectAdvancesinColloidandInterfaceSciencejournalhomepage:www.elsevier.com/locate/cisCeriumoxidenanoparticlespreparedinself-assembledsystemsa,⁎,JulianEastoebaAliBumajdad,AshaMathewaChemistryDepartment,Facult

2、yofScience,KuwaitUniversity,P.O.Box:5969Safat,13060,KuwaitbSchoolofChemistry,UniversityofBristol,BristolBS81TS,UKarticleinfoabstractAvailableonline31October2008Thisreviewconcernsrecentresearchonthesynthesisofceriumoxide(alsoknownasceria,CeO2)incolloidaldispersionsmediaforobtaininghighsurface

3、areacatalystmaterials.Nanoparticlesassmallas5nmandKeywords:surfaceareaashighas250m2/gcanbereadilypreparedbythismethod.Bothnormalmicellesandwater-in-MicroemulsionsoilmicroemulsionshavebeenemployedtodirectlyprecipitatenanoceriaorotherceriumprecursorswhichReversemicellescanbeconvertedintoceriab

4、ycalcination.Nanoparticles©2008ElsevierB.V.Allrightsreserved.SurfactantsCeriaCeriumoxideContents1.Introduction...............................................................562.Nanoparticlesynthesisusingassociationcolloids..............................................572.1.Surfactant-assiste

5、dmethods....................................................572.1.1.Aqueousmedia......................................................582.1.2.Water-in-oilmicroemulsions................................................593.Conclusions.............................................................

6、..65Acknowledgments...............................................................65References...................................................................651.IntroductionOtherimportantpropertiesofceriahavebeendemonstratedwhenitissynthesizedinnanoparticleforms,suchasshiftingandbroadeni

7、ngofCeria(ceriumoxide,CeO2)isacubicfluorite-typeoxide,andisRaman-allowedmodes[29],latticeexpansion[30,31],ultravioletblueconsideredasthemostimportantofrare-earthoxide,henceithasbeenshifts[32],anincreaseinelectronicconductivity[33],andboostingofexten