20.500.12556/DKUM-40924 SOL-GEL SINTEZA Cu-Ni NANODELCEV S TERAPEVTSKO PRIMERNO CURIEJE-VO TEMPERATURO SOL-GEL SYNTHESIS OF Cu-Ni NANOPARTICLES WITH THERAPEUTICALLY SUITABLE CURIE TEMPERATURE Namen diplomskega dela je bil sintetizirati CuNi nanodelce z različnimi sestavami (Cu30Ni70, Cu32,5Ni67,5, Cu35Ni65, Cu37,5Ni62,5 in Cu40Ni60) s sol-gel metodo. Sintetizirane vzorce smo po sušenju in staranju izpostavili termični homogenizaciji v cevni peči pri 850 °C, 24 ur v redukcijski atmosferi Ar/H2. Vzorcu, ki je pokazal najboljše lastnosti in primerno Curiejevo temperaturo smo izluževali (spirali) matrico iz silike s pomočjo raztopine NaOH ob prisotnosti različnih reducentov (askorbinska kislina, hidrazin). Z uporabo termogravimetrične analize (TGA) smo določali Curiejevo temperaturo (Tc) CuNi nanodelcev v vzorcih z različnimi sestavami. Želeli smo dobiti delce s primerno Curiejevo temperaturo, kateri bodo uporabni v magnetni hipertermiji. Rentgensko praškovno difrakcijo (XRD) smo uporabili za kvalitativno fazno analizo vzorcev. Z infrardečo spektroskopijo smo določali vsebnost silike v vzorcih pred in po spiranju. Rezultati so pokazali, da se temperatura (Tc) znižuje z manjšanjem vsebnosti Ni v vzorcu. Pri spiranju silike, pa je IR analiza pokazala, da ima vzorec, ki je bil najdlje izpostavljen alkalnemu mediju in hidrazinu, najmanj silike, ki obdaja delce. The aim of this diploma work was to synthesize CuNi nanoparticles of different compositions (Cu30Ni70, Cu32,5Ni67,5, Cu35Ni65, Cu37,5Ni62,5 and Cu40Ni60) using the sol-gel method. After drying and aging processes, the synthesized samples were exposed to thermal homogenization in a tube furnace at 850 °C for 24 hours in an Ar/H2 reduction atmosphere. We etched the silica matrix from the sample with the appropriate Curie temperature, with the help of a NaOH solution in the presence of various types of reducing agents (ascorbic acid, hydrazine). Using the thermogravimetric analysis (TGA), we determined the Curie temperature (Tc) of CuNi nanoparticles for samples of different compositions. We were looking for particles with appropriate Curie temperature, suitable for magnetic hyperthermia. The X-ray diffraction (XRD) has been used for qualitative phase analysis of samples. With the help of infrared spectroscopy (IR), we determined the presence of silica in samples before and after etching. Results showed that the temperature (Tc) decreases with lowering Ni content in the samples. Whereas, the infrared spectroscopy analysis for silica etching indicates that the sample, which has been exposed to an alkaline medium or hydrazine for the longest period of time, contains the lowest amount of silica, surrounding the particles. sol-gel metoda magnetni nanodelci silika Curiejeva temperatura rentgenska praškovna difrakcija. sol-gel method magnetic nanoparticles silica Curie temperature powder x-ray diffraction. true true false [N. Osenjak] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2013-06-28 15:48:36 2013-07-19 12:48:58 2022-05-03 03:06:53 2021-04-24 03:13:36 2013 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 661.8(043.2) 17477398 URN:SI:UM:DK:GMSK5ONZ UNI_Osenjak_Nina_2013.pdf UNI_Osenjak_Nina_2013.pdf 1 5AB50FEA200CCA8D4ADEDF497B6A0023 e2ea6b7bb4316f550dbc57bd1345d2ab6bbbf424d250106557c6a72fa44d9f4b 0f68731b-7c0a-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=56241 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0