Irena Ban (Author), Janja Stergar (Author), Mihael Drofenik (Author), Gregor Ferk (Author), Darko Makovec (Author)

Abstract

A chemical and a physical method have been applied for the preparation of chromium-nickel alloy nanoparticles. These particles were designed to be used for controlled magnetic hyperthermia applications. Microemulsions with Ni2+ and Cr3+ and/or NaBH4 as precursors were prepared using the isooctane/CTAB, n-butanol/H2O system. The samples of CrxNi1-x nanoparticles with the desired composition were obtained after the reduction of their salts with NaBH4 and afterwards heat treated in a TGA in a N2 atmosphere at various temperatures. The CrxNi1-x materials were also prepared by mechanical milling. Utilizing a ball-to-powder mass ratio of 20 : 1 and selecting the proper alloy compositions we were able to obtain nanocrystalline CrxNi1-x particles. Thermal demagnetization in the vicinity of the Curie temperature of the nanoparticles was studied using a modified TGA-SDTA method. The alloyʼs phase composition, size and morphology were determined with XRD measurements and TEManalyses.

Keywords

mechanical alloying;magnetic nanoparticles;magnetic hyperthermia;Curie point;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: IJS - Jožef Stefan Institute
UDC: 620.3
COBISS: 17438998 Link will open in a new window
ISSN: 1318-0207
Views: 1187
Downloads: 77
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Other data

Secondary language: Slovenian
Secondary abstract: Za pripravo nanodelcev zlitine $Cr_xNi_{1-x}$ smo uporabili kemijsko in fizikalno metodo. Delci so namenjeni uporabi v biomedicini, zlasti na področju kontrolirane magnetne hipertermije. Najprej smo pripravili mikroemulzije z $Ni^{2+}$, $Cr^{3+}$ in/ali $NaBH_4$ prekurzorji v sistemu izooktan/CTAB, n-butanol/$H_2O$. Vzorce $Cr_xNi_{1-x}$ nanodelcev z željeno sestavo smo dobili po redukciji njihovih soli z $NaBH_4$ in naknadnem segrevanju v TGA v atmosferi $N_2$ pri različnih temperaturah. Nanodelce $Cr_xNi_{1-x}$ smo sintetizirali tudi s pomočjo mehanskega mletja zmesi kromovih in nikljevih prahov. Mleli smo v visokoenergijskem krogličnem mlinu SPEX 8000M. Z uporabo primernega masnega razmerja med mlevnimi kroglicami in prahom 20:1 in izbiro primerne sestave smo dobili nanodelce zlitine $Cr_xNi_{1-x}$. Curiejevo temperaturo nanodelcev smo določili z uporabo modificirane TGA-SDTA metode. Sestavo nanozlitine, velikost in morfologijo delcev smo določili s pomočjo meritev XRD in TEM analize.
Secondary keywords: nanozlitine;krom;nikelj;magnetni nanodelci;magnetna hipertermija;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 750-755
Volume: ǂVol. ǂ60
Issue: ǂno. ǂ4
Chronology: 2013
ID: 9108669