Physico-Chemical nanomaterials science

Structure and magnetic properties of water-based Fe and Fe oxides colloidal solutions obtained by different methods
Holiatkina M.O.1, Gilchuk A.V.1, Perekos A.O.2, Voynash V.Z.2, Mordyuk B.N.2
1 Institute of Physics and Technology, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Prospect Peremohy, 37, Kyiv-03056, Ukraine. 
E-mail: holiatkina@ukr.net
2 G. V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, blvd. Akademika Vernadskogo, 36, Kyiv-02000, Ukraine.

As a part of the work water-based colloidal solutions of Fe and Fe oxides particles were fabricated by two different methods: the spark erosion method (SE) and the wet mechanical grinding with ultrasonic frequency treatment in a ball mill. All colloidal solutions contain sodium dodecylbenzenesulphate (SDBS)) as a surfactant for a colloid stability [1].
The paper contains studies of particles size distributions, phase composition, morphology and local phase composition, magnetic parameters (magnetization curves, saturation magnetization, coercive force, residual magnetization). The particle size distributions were done with the laser sedimentograph Mastersizer 2000 with the module of liquid dispersion HydroS (Malvern Instruments, UK). The phase composition was examined by X-ray diffraction analysis done with the diffractometer Ultima IV (Rigaku). The morphology and local phase composition was examined using the transmission electron microscope ПЭM-У (upgraded) equipped with a digital imaging system CAИ-01A. The magnetic parameters were studied using the Steinberg ballistic magnetometer.
According to the research results, a conclusion about relevance of the particles size and structure of colloidal solutions obtained by the forementioned methods for the production of magnetic fluids needs [2] was made in the paper.

1.	V. I. Petrenko, et al. On the impact of surfactant type on the structure of aqueous ferroﬂuids // Colloids Surf. A: Physicochem. Eng. Aspects.-2017.-P. 1-5.
2.	R. E. Rosensweig. Ferroﬂuids: Introduction // Elsevier Inc. All rights reserved-2016.-12 p.