Petrenko V. Structure and physical properties of magnetic fluids

The thesis concerns the structure and physical properties magnetic fluids (MF) of various kinds: non-polar and polar (aqueous) ferrofluids with sterical stabilization by surfactants layer; MF with addition of bio-macromolecules. The question of necessary amount of surfactants for obtaining of most stable polar and non-polar MF is discussed. Structural characterization of initial aqueous MF as well as biocompatible MF after PEG modifications were done by SANS and some complementary techniques. Impact of PEG polymer addition into aqueous micellar solutions was investigated in the given thesis. Thus, decrease of micelles aggregation number and decrease of intermicelles interaction were found at PEG addition. Structure diagnostic of water-based MF and bio-macromolecules was carefully performed. Impact of magnetic loading factor as well as solution pH on structure and stability of magnetoferritin complexes was found. Structure characterization of aqueous amyloids solutions and interaction of magnetic nanoparticles with amyloids were also studied in detail.