20.500.12556/DKUM-56231 Synthesis of chromium-nickel nanoparticles prepared by a microemulsion method and mechanical milling 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 $Ni^{2+}$ and $Cr^{3+}$ and/or $NaBH_4$ as precursors were prepared using the isooctane/CTAB, n-butanol/$H_2O$ system. The samples of $Cr_xNi_{1-x}$ nanoparticles with the desired composition were obtained after the reduction of their salts with $NaBH_4$ and afterwards heat treated in a TGA in a $N_2$ atmosphere at various temperatures. The $Cr_xNi_{1-x}$ 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 $Cr_xNi_{1-x}$ 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. 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. mechanical alloying magnetic nanoparticles magnetic hyperthermia Curie point nanozlitine krom nikelj magnetni nanodelci magnetna hipertermija true false true Angleški jezik Slovenski jezik Znanstveno delo 2015-12-21 16:53:48 2015-12-21 16:53:48 2022-06-11 03:08:50 2021-05-15 03:29:38 2013 0 0 str. 750-755 št. 4 Letn. 60 2013 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1318-0207 620.3 14086149 17438998 1318-0207 URN:SI:UM:DK:ZCKSRM9E Acta_Chimica_Slovenica_2013_Ban_et_al._Synthesis_of_chromium-Nickel_nanoparticles_prepared_by_a_microemulsion_method_and_mechanical_mill.pdf Acta_Chimica_Slovenica_2013_Ban_et_al._Synthesis_of_chromium-Nickel_nanoparticles_prepared_by_a_microemulsion_method_and_mechanical_mill.pdf 1 0B000CF0380206632968ADF8EC782276 c7040499a172df88e6f024b2bcb35fe4e4e18baff42b106e15c93d419aaeb2a9 90581858-7c0e-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=116057 http://acta-arhiv.chem-soc.si/60/60-4-750.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=84364 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0