I. Gerasimets, Student, Tel.: +38096 642 33 28, E-mail: Herasimets@i.ua,

O. Petrenko, Student, Tel.: +38097 664 31 83, E-mail: Ksuha_Petrenko@ukr.net,

T. Savchenko, Student, Tel.: +38068 034 17 10, E-mail: Konfetka-t.s@ukr.net,

Geological Faculty, Taras Schevchenko National University of Kyiv

90 Vasylkivska Str., Kyiv, 03022 Ukraine

J. Kardanets, Postgraduate Student, A. Grechanovsky, Senior Research Associate,

N. Dudchenko, Senior Research Associate

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation

National Academy of Sciences of Ukraine

34 Ącad. Palladina Ave., Kyiv, 142, 03680, Ukraine

SYNTHESIS AND PROPERTIES OF BIOGENIC MAGNETITE SYNTHETIC ANALOGUES


This paper deals with different factors (ultrasonication, magnetic field) in determining the properties of synthesized magnetite nanoparticles. Development of technologies for creating synthetic analogues of magnetic minerals localized in human and other living organism tissues is of great importance in solving a wide range of mineralogical, medical-biological and material science problems. Magnetite is one of the physiological biominerals in living organisms, its formation being genetically determined. Magnetically ordered biogenic nanoparticles of iron oxides and hydroxides, which are biominerals, are known to realize a wide range of biological functions, including animals' orientation in space, and to play an important role in brain functioning. Migratory birds, bees, fish develop a sense of direction in space ("magnetic compass") due to the presence of magnetite, which is why this vital biomineral is of wide scientific interest. The paper describes the methods of magnetite nanoparticle synthesis using a magnetic field and ultrasound. Co-precipitation is described as one of the easiest chemical methods of synthesizing magnetic nanoparticles. Samples were synthesized by employing the method of co-precipitation of Fe3+ and Fe2+ salts in an alkaline medium involving ultrasound and magnetic fields. X-ray diffraction and magnetometry were used to study the samples. Special attention was given to the magnetic properties and determining the crystallite size of the produced mineral. The research results showed a correlation between the crystallite size and various synthesis conditions. With ultrasound applied, the size of the synthesized nanoparticles tends to be bigger as compared to that of the nanoparticles obtained without ultrasonication. It was determined that magnetization of samples increases with the increase in the size of nanoparticles. The research results are summarized in the tables and illustrations presented in the paper. The obtained data can be used for developing and improving the technologies for biogenic magnetite analogue synthesis. The paper could be of use to teachers, students, and researchers interested in biomineralogy and magnetic nanoparticle synthesis.

Keywords: biogenic magnetite, co-precipitation method, synthesis, nanoparticles, X-ray analysis, magnetometry.