Abstract
With the aim of studying the influence of synthesis parameters in structural and magnetic properties of cobalt-doped magnetite nanoparticles, Fe3−xCoxO4 (0 < x < 0.15) samples were synthetized by thermal decomposition method at different reaction times (30–120 min). The Co ferrite nanoparticles are monodisperse with diameters between 6 and 11 nm and morphologies depending on reaction times, varying from spheric, cuboctahedral, to cubic. Chemical analysis and X-ray diffraction were used to confirm the composition, high crystallinity, and pure-phase structure. The investigation of the magnetic properties, both magnetization and electronic magnetic resonance, has led the conditions to improve the magnetic response of doped nanoparticles. Magnetization values of 86 emu·g−1 at room temperature (R.T.) have been obtained for the sample with the highest Co content and the highest reflux time. Magnetic characterization also displays a dependence of the magnetic anisotropy constant with the varying cobalt content.
Highlights
A deficiency of cobalt has been previously established in similar ferrite nanoparticles prepared with oleic acid (OA), oleylamine (OLA), and 1,2-hexadecanediol (HDD) as surfactants [16]
This work provides a deeper insight into the obtaining of cobalt-doped ferrite nanoparticles with the Fe3−xCoxO4 (0 < x < 0.15) general formula
This change in the preparation process seems not to significantly affect the average particle size or the particle size distribution, but influences the real cobalt content in the samples, as in all cases smaller amounts of cobalt have been confirmed by ICP analysis
Summary
11. .IInnttrroodduuccttiioonn magnetic resonance imaging [1], drug (cihuaccotanaoaamhtttmdtaoalrprynhhohomrncegcyinmppdgaaeseeetslsdeptuuppgglreeeiephttiaeazNMaaldtrhhlefnncreMNeoycirhpreptlhrdeteeeetahtlesaseutpemhyaaurttarnqihdmiegmrioudtnelroeagacwuroioeiniacbltrwoecsnolosmnaasiserclmeea,ipscn)sgyeiyrattnttitttiziHteeehetta,ipnsizhdpiaachietdasorprntmbe,tygepeeridiohasena[rddoase[tr,ehlilt5naio5ingtiaonlmonνgmcni]icoiagm]amndapgnc)d.nt.haalnfnritnssohaies)I[esati-enhacfe6noisagIoussi-gisrooeeagnntsoi,enanpneot7annottannpngdfitqohce]anncgceuttsdiaao.huutihrormtaiottoarslrisostiyhhaaetritnnamttinfeaoseleanaingsreceetecadcldrtagttileeecasesrlslssenaoeicaiseyonoontsttxsnltfcnatai,srsralpnrftocm,ecatgiunut,osνtemaainrrimynFondct)carmFaiscle,abciestpttteg[[aagebnuueettet3i16aa,lt3sgsiiiohirrOedrO],rrogcnmonsea7nnm,seeeesuntn,mgti4]o4seasabra(su.,p,eedonesemttctogya[eratdiiueeddxaf1oratzairdnnrrdeuzitrc]putunemtatecegpmi,ouiaighceedetattoocadptarbiaoaiereliioanmncergtrtpyltytonntaanooniuies,naanaofeoatpmaac,sgmiprsemsr,ntgntepemangh.sauhthpalsnhrtaitludaemTdiebgeaciulcpgiegotgcibiigh,rjntoicrtlrhearnafnrgnnjheiheaaneaecegtcteaeebgbotttirnchtda(ntvoiiintrteiimtindcootfioeiiioeoeanzmonmct[nanofmenctlicaaos2pgsuoitfsloiao.talencg,umodanat.in3enmmnnA[ioeearrnAt,]ns2nseamottrenen,ndepp,istnangdraop3ec,oeon.daaaaenamncn]fldiarpfcegts,tntietaoederiiytitetiaamn,dtbTvbtsteiptn(,iorhiigitaemiNeiohcngasztaolalnnhetnrilioinireaignfPceptnatmabeodctatyylsandigl)teiimemvcl,lt,i-oabolnremealyhcbltaygmsamnisteo,aera(eaolit,ttoneNstrn,gugpcaausseomhtndeaoeaeenbehabndaPrdsetavenpdbpsereieieeriaii)etllrcteahtttmdtabaicdrleeatai-piniisrihhohaerroibirttrnntneiycrirfiamcanoiyhyttgaaeseeeacifatalmmtsddgpeytre,ppeteiggro,eiebetesatcaunnelaat,irataaheofnecNaeldalgomMoetirhpanrapaeaeaehnrsgrndnrieentmnfnepnpior,ssetinespueehandtadia2zdiqteemiarodtnsou+iaiclmsrogopeetgeucehtausioraclhe[ps[ltcriwtcnnao,nleosetn[4cb8oeicertaicdmolieaai4,cnr)sscremteeyo]n,inytwcniswrtp9rar]o,t,snetttaw(ssliipadac,hhotyhioi]tabeaaorprppaenticty.gupcorapuooeciathmcneenlncyrdadss[ooIr,ehyapyrrilrplycoiy5finytirooeelienνmpcpatnitzeiceoiaes]mtmtsiegspprcoh)nptc.ieoolte,emnadrlf,epalssrihhshtioaI[ret,aapintdntgcciliol6niiostaoooui-anrewsassisglenasloissoi,xnytnsexuerigheeaatds7antsttnuniacpefiiehsaaohssitcntn]annctlgeterdssccaadaei.ansulisiuipidececn,dioetiattbeconsnlretirosthtidhaatpHtrzdehymantgsetneeycssotsielnadinnoeee,,,eclssraec,,,rtateeorsl,enicseootspxccaisapnfcnoecat,omaiidybgnntrmFs,aacpegtebflethae,lt3siireOogmroseafruntnemt4idra(ur,ptenecgreiertedavoiasaidntrztuatnetepmiuwailcedtoeactraieoiinnacertlton bbeetutunneeddbbyyppaartritaialllylyrerpeplalcaicninggththeedidviavlaelnetnot rotrrtivriavlaelnetnitroirnonioinosnws iwthitchactiaoNtniaosnnolmsikaletiekrZieanlZs22+n0,21+M8,,M8n,2xn+;2,d+,CoiC:oFo2O+2+,R, PEER REVIEW aannddNNi2i+2+ [[88,,99]]. Thermal decomposition of iron(III) acetylacetonate, Fe(acac), and cobalt(II) acetylacetonate, Co(acac), or metal oleates in high-temperature solvents have been used for preparing CoFe2O4 of different shapes and sizes by changing reaction times, temperature, surfactant concentration, solvent, or precursor ratios [12,13]. This method usually yields more homogeneous nanoparticles, it requires an ulterior transference to water media. A rigorous magnetic study of the samples was performed by means of a superconducting quantum interference device (SQUID) magnetometer and an electron magnetic resonance (EMR)
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