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Urszula Klekotka

Institute of Chemistry, University of Bialystok, Bialystok, Poland

Ferrofluid systems have been found to possess very interesting thermophysical properties such as thermal conductivity, thermal diffusivity, viscosity or connective heat transfer. Detailed analysis of magnetic properties of magnetic nanoparticles is of crucial importance from the application’ point of view. That is why magnetization measurements significantly contribute into studies on magnetic nanoparticles, and can expand material characterization.

During my Short Term Scientific Mission, I have measured different types of previously prepared samples of iron oxide (Fe3O4 – magnetite) nanoparticles. Tested nanostructures were obtained via the same synthetic method, but in every case amount of: metallic precursor, or stabilizng coating layer was different. Because of that, obtained nanoparticles possess various composition and thicknesses of the shell (other iron oxide- maghemite, hematite, or metallic e.g. silver). During my stay, Zero Field Cooled/ Field Cooled (ZFC/FC) at 50 Oe, in temperature range 1.8-300K, and hystereses at 1.8K, 10K, and 300K, were taken. All experiments were undertaken in the liquid helium environment. Such studies were performed to see how magnetic properties changes due to size of: magnetic core, stabilizing coating layer, and addition of silver shell.

 Results obtained druing STSM magnetization correspond very well with other data obtained for analyzed systems (X-ray diffraction, Mössbauer spectroscopy). Therefore, all studies will be presented in further publication.

Poster/Oral presentation(s) /Conference abstract(s) originating from this mission