Synthesis of chromium-nickel nanoparticles prepared by a microemulsion method and mechanical milling

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

Povzetek

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.

Ključne besede

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

Podatki

Jezik:	Angleški jezik
Leto izida:	2013
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	IJS - Institut Jožef Stefan
UDK:	620.3
COBISS:	17438998
ISSN:	1318-0207
Št. ogledov:	1187
Št. prenosov:	77
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarni povzetek:	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.
Sekundarne ključne besede:	nanozlitine;krom;nikelj;magnetni nanodelci;magnetna hipertermija;
URN:	URN:NBN:SI
Vrsta dela (COBISS):	Znanstveno delo
Strani:	str. 750-755
Letnik:	ǂVol. ǂ60
Zvezek:	ǂno. ǂ4
Čas izdaje:	2013
ID:	9108669