Magnetic properties of magnetic nanoparticles (MNPs) with different polymer coatings

Abstract

Nanodelci imajo čedalje večji potencial v različnih industrijah zaradi svojih izjemnih fizikalnih in kemijskih lastnosti. Prilagajanje magnetnih lastnosti nanodelcev je ključno za oblikovanje novih večnamenskih materialov. V magistrskem delu smo proučevali vpliv različnih razmerij ionov Fe2+ in Fe3+ na strukturne in magnetne lastnosti nanodelcev. MNPs smo sintetizirali z metodo koprecipitacije. Izvedli smo tudi študijo vpliva različnih polimernih prevlek (aminosilan ali arabinogalaktan) na lastnosti modificiranih MNPs. Prevleka preprečuje aglomeracijo MNPs in stabilizira MNPs. MNPs, prevlečeni s polimernimi prevlekami, so po navadi tudi bolj biokompatibilni. Sintetizirane delce smo okarakterizirali z analiznimi metodami, kot so FTIR, TGA in VSM. Z analizami smo potrdili prisotnost polimernih prevlek na površini MNPs. Določili smo termične stabilnosti modificiranih MNPs. Prav tako so vsi modificirani MNPs izkazovali superparamagnetno naravo. MNPs z arabinogalaktansko prevleko v razmerju Fe²⁺ : Fe³⁺ = 2 : 1 celo izkazujejo protibakterijsko učinkovitost na E. coli in S. aureus.Nanoparticles have an increasing potential in various industries due to their exceptional physical and chemical properties. Tailoring the magnetic properties of nanoparticles is THE key to designing new multifunctional materials. In this master\u27s thesis, we studied the influence of different ratios of Fe2+ and Fe3+ ions on the structural and magnetic properties of nanoparticles. MNPs were synthesized by the co-precipitation method. The influence of different polymer coatings (aminosilane or arabinogalactan) on the properties of modified MNPs was investigated as well. Such polymer coating prevents agglomeration of MNPs and increases stabilization of the particles. MNPs coated with polymer coatings are usually more biocompatible. The synthesized particles were characterized by analytical methods such as FTIR, TGA and VSM. The analysis confirmed the presence of polymer coatings on the surface of MNPs. The thermal stabilities of modified MNPs were determined. In addition, all modified MNPs exhibited superparamagnetic nature. MNPs with an arabinogalactan coating in the ratio Fe²⁺: Fe³⁺ = 2:1 even demonstrated antibacterial efficiency against E. coli and S. aureus