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1、RESEARCHRevistaMexicanadeF´ısica59(2013)224–228MAY–JUNE2013Monodispersemagneticnanoparticles:EffectsofsurfactantsonthereactionbetweenironacetylacetonateandplatinumacetylacetonateK.Chokprasombata,C.Sirisathitkula;¤,P.Hardinga,S.Chandarakb,andR.YimnirunbaMolecularRe
2、searchUnit,SchoolofScience,WalailakUniversity,NakhonSiThammarat80161,Thailand.bSchoolofPhysics,InstituteofScience,SuranareeUniversityofTechnologyandSynchrotronLightResearchInstitute(PublicOrganization),NakhonRatchasima30000,Thailand,Tel:+66-75-672-945*e-mail:schit
3、nar@wu.ac.th;Received16October2012;accepted6February2013Magneticpropertiesofmonodispersenanoparticlesforultrahighdensityrecordingandbiomedicalapplicationsaresensitivetotheirshapeandsizedistributions.Theseattributesare,inturns,dictatedbyseveralparametersduringthesy
4、nthesisandheattreatments.Inthiswork,monodisperseFePt-basedmagneticnanoparticlesaround5nmindiameterweresynthesizedbythereactionbetweenironacetylacetonate(Fe(acac)3)andplatinumacetylacetonate(Pt(acac)2)inbenzylether.X-rayabsorptionnear-edgestructure(XANES)spectraagr
5、eedwithtransmissionelectronmicroscopy(TEM)andenergydispersiveX-rayspectroscopy(EDS)thatas-synthesizednanoparticleswerecomposedofPt-richnucleiandironoxides.Whereastheircompositionandsizewasnotsensitivetothevariationintheamountofsurfactants(oleicacidandoleylamine),t
6、henanoparticlesexhibitedalargervariationinshapewiththeincreaseineachsurfactantfrom1.5to4.5mmol.After±annealinginargonatmosphereat650Cfor1hour,thenanoparticlestendedtoagglomerate.Higheramountsofsurfactantssurroundedthenanoparticlesapparentlyallowedmoresinteringbeca
7、usethedecomposedcarbonfromtheexcesssurfactantsfacilitatedthereductionofironoxides.MoreFeinthelargeannealedparticlesthenresultedinferromagneticproperties.Bycontrast,theferromagneticbehaviorandthehighestcoercivitywereobtainedwithoutsuchagglomerationinthecaseofanneal
8、edparticlessynthesizedbyusingtheminimumsurfactants.Keywords:Magneticnanoparticles;Modifiedpolyolprocess;Oleicacid;Oleylamine.PACS:75.75.-c;75.50.Bb1.Intr
