20.500.12556/DKUM-54163 Sinteza in karakterizacija maghemitnih nanodelcev (γ-Fe2O3) za aplikacije v osmotskih procesih Synthesis and characterization of maghemite nanoparticles (γ-Fe2O3) for applications in osmotic processes Cilj diplomske naloge je sintetizirati maghemitne nanodelce (γ-Fe2O3) oblečene s polietilenglikolom (PEG) in primernim osmotskim tlakom, ki so načrtovani za uporabo pri čiščenju vod z metodo napredne osmoze (FO). V diplomski nalogi smo izvedli tri različne postopke priprave magnetnih maghemitnih nanodelcev. Prav tako smo za oblačenje delcev uporabili surfaktant PEG s tremi različnimi molskimi masami. Glede na izbrane možnosti smo s pomočjo termogravimetrične analize (TGA) in rentgenske praškovne difrakcije (XRD) karakterizirali sintetizirane nanodelce. Iz rezultatov smo ocenili velikost nanodelcev s pomočjo Scherrerjeve enačbe. Prav tako so rezultati TGA in RTG analize pokazali, da pri segrevanju vzorcev pride do transformacije iz maghemita v hematit pri temperaturi okoli 600 °C, kar se ujema s podatki v literaturi. Meritve osmotskega tlaka pa so pokazale, da tako pripravljeni delci za načrtovano aplikacijo niso primerni, saj niso izkazovali dovolj velikega osmotskega tlaka pri načrtovanju vtoka pri FO. The aim of the thesis is to synthesize maghemite nanoparticles (γ-Fe2O3) coated with polyethyleneglycol (PEG) and a suitable osmotic pressure, which are designed for use in cleaning water through the method of forward osmosis (FO). In the thesis, we carried out three different procedures for the preparation of magnetic maghemite nanoparticles. We also used surfactant PEG, with three different molecular weight. Depending on the selected options and with the help of thermogravimetric analysis (TGA) and X-Ray diffraction (XRD) we characterized synthesized nanoparticles. From the results the size of the nanoparticles can be estimated by Scherrer equation. The results of the TGA and XRD analysis have shown that while heating the samples a transformation occurs from maghemite to hematite at a temperature of around 600 °C, which corresponds with the data in the literature. Measurements of osmotic pressure have shown that the particles are not suitable for the intended application as they do not supply sufficient osmotic pressure for planning the draw solution in FO. maghemit termogravimetrična analiza rentgenska praškovna difrakcija oblačenje delcev maghemite thermogravimetric analysis X-Ray diffraction coating of nanoparticles true true false [V. Petek Regoršek Slovenski jezik Angleški jezik Diplomsko delo/naloga 2015-08-24 17:20:50 2015-10-29 13:46:13 2022-06-04 03:11:04 2021-05-09 03:35:14 2015 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.091.3:[620.3:661.872'022](043.2) 19123222 URN:SI:UM:DK:TXFVG0NO UN_Petek_Regorsek_Vita_2015.pdf UN_Petek_Regorsek_Vita_2015.pdf 1 D23BD45F03CAD26331CF9FF25E7EC6F6 f846b979bfc8a55e8ba6dc0e355e71cbccc5d94ef0dc77adb85fb3d5e6cf9d12 46e55e1f-7c07-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=81096 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0