20.500.12556/DKUM-37711 SINTEZA NANODELCEV POD VPLIVOM MIKROVALOV MICROWAVE SYNTHESIS OF NANOPARTICLES Namen diplomskega dela je bil spoznati metodo mikrovalovne sinteze ter jo uspešno uporabiti pri sintezi magnetnih nanodelcev-CoFe2O4. Sprva smo uporabili dve mešanici topil (voda/etanol in voda/1-heksanol) in oleinsko kislino kot surfaktant v obeh sistemih. Zaradi boljšega raztapljanja reagentov smo se pri analizah osredotočili na topilo voda/1-heksanol. V tem sistemu smo preučili vpliv sinteznega časa in množine surfaktanta na velikost nanodelcev. Poleg tega smo preučili rast delcev s strukturo »jedro-lupina«, pri čemer smo za jedro uporabili najbolj kristalinične nanodelce CoFe2O4. S pomočjo rentgenske praškovne difrakcije (XRD) smo kvalitativno karakterizirali sintetizirane nanodelce kobaltovega ferita ter ocenili njihovo velikost. Meritve velikosti delcev smo opravili tudi z metodo dinamičnega sipanja svetlobe (DLS). Metoda nam je potrdila že dobljene rezultate o velikosti delcev s strukturo »jedro-lupina«, medtem ko so se ostali vzorci čez nekaj časa aglomerirali. Reakcije pod vplivom mikrovalov so izredno hitre in nam dopuščajo veliko možnosti za spreminjanje parametrov. Tako postaja danes mikrovalovna sinteza vse pomembnejša na področju sintetične kemije in prepoznavnejša v znanstveni sferi. The aim of the diploma work was to learn about microwave synthesis method and successfully use it for the synthesis of CoFe2O4 magnetic nanoparticles. At first we used two solvent mixtures (water/ethanol and water/1-hexanol) and an oleic acid as a surfactant in both systems. Due to the better dissolving of reagents, we focused our work on the solvent water/1-hexanol. In this system we examined the influence of the synthesis time and the amount of surfactant on the size of nanoparticles. Additionally we examined the growth of core-shell nanoparticles with seed-mediated approach. For seed-mediated approach we used seeds of CoFe2O4 nanoparticles, which exhibit the best crystallinity. Samples were characterized with XRD analysis and the crystallite size of cobalt ferrite nanoparticles was estimated by Scherrer equation. The size measurement was also performed by the method of dynamic light scattering (DLS). The method confirmed our previous size results of coated nanoparticles, while the rest of the samples agglomerated after some time. Reactions under the microwaves are extremely fast and offer many options for changing parameters. So today the microwave synthesis is becoming more and more important in synthetic chemistry and popular in scientific community. mikrovalovna sinteza kobaltov ferit nanodelci rentgenska praškovna difrakcija nanodelci »jedro-lupina« microwave synthesis cobalt ferrite nanoparticles x-ray powder difraction »core-shell« nanoparticles true true false [A. Grdjan] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2012-09-07 14:01:37 2012-09-11 11:56:58 2022-04-24 22:03:47 2021-04-18 03:41:00 2012 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 54.057:[620.3:546.72](043.2) 16606742 URN:SI:UM:DK:AUONDJXB UNI_Grdjan_Ales_2012.pdf UNI_Grdjan_Ales_2012.pdf 1 1AC9890E7CC9B4176C322413483E429A b1335299d271a07b9439c3f7d19d61bd966707c7faf101da7caedf8eb374688a 5018bc3f-7c08-11eb-bb7a-00155d0001ca 20.500.12556/dkum/f2cb5855-1605-4a38-bb44-a90b7195fab3 https://dk.um.si/Dokument.php?lang=slv&id=49845 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0