Nanocomposites and nanomaterials

Polymer-Magnet Nanosystems
Aksimentyeva O.I., Horbenko Yu.Yu.
Ivan Franko National University of Lviv, Kyryla &Mefodia str., 6/8, Lviv 79005, Ukraine. E-mail: aksimen@ukr.net

Providing macroscopic magnetism in organic materials is a very complex but quite promising scientific problem [1]. The need to create an organic magnet is due to a number of expected advantages, such as lightness, transparency, flexibility, ability to switch under the influence of light (magneto-optics), sensitivity to external influences (sensors), creation of modern toners for digital printing, adsorbers of radiation, etc. Studying the state of a spin glass, biomagnetism, and the mechanism of action of paramagnetic probes in living tissues can help to understand the mechanism of biological processes, in particular, human thinking and DNA functioning [2].
In this report, we are considering the methods of synthesis, structure, magnetic and other properties of the new organic molecular magnetics based on organometallic complexes, conducting polymers doped with magnetic probes, and the polymers filled with transition metal oxides nanoclusters.
The dependences of the magnetic susceptibility of the polymer-magnet nanomaterials on the temperature in the range of 1.5-300 K, frequency and magnetic field strength were measured and analyzed. At low temperatures, the peculiarities of magnetic behavior characteristic of the state of spin glass are revealed for iron complexes with 1-nitroso-2-naphthol [2]. The temperature and frequency transformation in ESR spectra has been studied in model polymer-magnet nanostructures of conjugated polyarenes doped by magnetic clusters. For the first time, hybrid composites simultaneously with magnetic, luminescent and electrically conductive functions were obtained by surface modification of polymer-magnetic nanocapsules with luminescent nanocrystals and a conducting polymer shell. 
The study of magnetic properties of polymer-magnet nanosystems can help to understand the nature of “organic magnetism” and identify new approaches to the creation of functional hybrid nanomaterials. 

1.	Miller J.S. Organic- and molecule-based magnets // Mater. Today.-2014.-17.-P. 225-235.
2.	Dyakonov V.P., Zubov E., Aksimentyeva E., et al. Low-temperature magnetic behavior of the organic-based magnet Na[FeO6(C10H6N)3] // Low Temp. Phys.-2014.-40.-P. 835-841.