20.500.12556/DKUM-11615 SINTEZA IN LASTNOSTI MAGNETNIH TEKOČIN NA OSNOVI MAGNETITA - Fe 3 O 4 SYNTHESIS AND PROPERTIES OF MAGNETIC FLUIDS BASED ON MAGNETITE - Fe 3 O 4 Namen diplomskega dela je bil sintetizirati ustrezno magnetno tekočino za uporabo v magnetni hipertermiji na osnovi magnetita (Fe3O4), v obliki palčk, oblečenega s CM — dekstranom v vodi kot nosilni raztopini. S pomočjo rentgenske praškovne difrakcije (XRD) smo ocenili velikost nanodelcev magnetita in kvalitativno karakterizirali vzorce. Morfologijo nanodelcev smo preučevali s transmisijskim elektronskim mikroskopom (TEM). Fizikalne lastnosti vzorcev, ki so bili izpostavljeni kontroliranemu programu segrevanja, smo dobili s pomočjo termogravimetrične analize (TGA). Magnetne meritve so bile izvedene z DSM — 10 magnetometrom. Izvedli smo tudi kalorimetrične meritve za magnetne tekočine. Rezultati so pokazali, da čas sintetiziranja vpliva na obliko in velikost neoblečenih delcev in oblečenih delcev s CM — dekstranom. Daljši je čas sintetiziranja, večje in bolj kristalinične nanodelce dobimo. Morfologija nanodelcev posneta s pomočjo TEM, nam kaže paličasto obliko delcev. Magnetne meritve so pokazale ozko histerezno krivuljo s Hc= 31,6 A/m, Mmax= 92,1 Am2/kg in MR= 2,21 Am2/kg. The purpose of this work was to synthesise the appropriate magnetic fluid for use in magnetic hyperthermia on the basis of magnetite (Fe3O4), in the form of rods, coated with CM - dextran in water as the carrier liquid. The size of magnetite nanoparticles was estimated by scherrer equation. Samples were characterized with XRD analysis. The morphology of nanoparticles was studied with transmission electron microscopy (TEM). Physical properties of the samples followed with controlled heating program, were measured with termogravimetric analysis (TGA). Magnetic measurements were carried out by DSM - 10 magnetometer. Calorimetric measurements were performed for the magnetic fluid also. The results showed that the synthesis time influenced the shape and size of uncoated particles and particles coated with CM - dextran. The longer the time of synthesis was, the larger and more crystalline nanoparticles were obtained. Morphology of nanoparticles recorded with the help of TEM showed rod - like particles. Magnetic measurements showed a narrow hysteresis curve with Hc= 31,6 A/m, Mmax= 92,1 Am2/kg and MR= 2,21 Am2/kg. Magnetit magnetna tekočina rentgenska praškovna difrakcija magnetne meritve sproščena toplotna energija transmisijska elektronska mikroskopija termogravimetrična analiza. Magnetite magnetic fluid X-ray diffraction magnetic measurements specific absorption rate transmission electron microscopy termogravimetric analysis. true true false [J. Damiš] Slovenski jezik Angleški jezik Diplomsko delo 2009-09-05 17:23:17 2009-12-22 09:30:54 2022-04-12 00:01:49 2022-04-18 03:20:03 2009 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.086.4(043.2) 13537046 URN:SI:UM:DK:GDCITEC2 UNI_Damis_Janja_2009.pdf UNI_Damis_Janja_2009.pdf 1 B43C1FD3DDAC196579D3C689FF210E9C dc4eefb1ff63993951250887ab8e86bfd1562a0e1651609ddd9cebe99f44b2b3 2c4b4312-7c03-11eb-bb7a-00155d0001ca 20.500.12556/dkum/1433d49e-4f95-47c9-ba1c-dbf76e5c42f5 https://dk.um.si/Dokument.php?lang=slv&id=10436 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0