ABOUT

• History and activity
• Structure
• Scientific employees
• Employees who worked
• Projects
• International projects
• Developments
• Gender Equality Plan
• Academic сouncil
• Specialized academic council
• Council of young scientists
• Ukrainian Mineralogical Society
• Committee on meteorites
• Postgraduate studies, doctoral studies
• Center for collective use
• Mineralogical Museum named after Academician V.I. Vernadsky
• Contacts

PERIODICALS

• Геохімія та рудоутворення
• Мінералогічний журнал
• Записки Українського мінералогічного товариства

INFORMATIONAL
MESSAGES

• Exhibition
• Defense of dissertation
• Conference
• Scientific readings
• Director elections
• Vacancies
• Solemn meeting of the Academic Council
• Popularization in mass media
• Lecture, seminar

Abnormal physical properties of biogenic magnetite nanocrystals located in brain tissues

ABSTRACT

Report on the SRW: 1 book, 234 pages, 123 illustrations, 27 tables, 140 references.

The object of research is samples of natural iron oxides and hydroxides (magnetite, maghemite, hematite, goethite, etc.), samples of synthetic (similar in composition and structure to biogenic, synthesized by various technologies) magnetite nanoparticles, and samples of biological tissues containing magnetically ordered nanoparticles of iron oxides/hydroxides.

The purpose of the work: the study of abnormal physical effects detected by the method of ferromagnetic resonance on nanoparticles of biogenic magnetite localized in brain tissues, as well as the development of new methods for diagnosing the characteristics of magnetic nanosystems.

Research methods and equipment: magnetometry method (magnetometer with a Hall sensor), magnetic resonance method (EPR spectrometers RE-1306 (Russia), PS100X (Belarus)), nuclear gamma resonance spectroscopy method (Wissel spectrometer (Germany) using a source ⁵⁷Co in the Cr matrix), optical microscopy (Nikon ECLIPSE LV100POL microscope), theoretical calculations.

Results and their novelty: Anomalous dynamic effects arising when a strong resonant microwave field is applied to magnetite nanoparticles were studied and it was shown that such a field stimulates the transformation of the properties of magnetic particles and transfers the nanoparticle system to a new special state. It was experimentally shown that when a microwave field with a power P greater than the critical Pcr (80 mW) is applied to the sample, additional parabolic zones appear on the contour of resonant signals. A comparison of dynamic effects with the behavior of substances in macroscopic quantum states gives grounds for the assumption that a strong microwave field stimulates the transition of a system of biogenic magnetic nanoparticles into a macroscopic quantum state. Spectra of multi-resonance absorption of electromagnetic waves in the centimeter range by magnetic nanoparticles in the composition of biological tissues were recorded.

Recommendations for the use of the results of the work: the results can be used in the search for conglomerates of nanosized particles, diagnostics of the characteristics of magnetic nanosystems, as well as for the creation of a new class of materials for storing and processing information based on new principles.

Authors:

Other authors:

N.O. Dudchenko, A.M. Kalinichenko, V.L. Karbivskyi, O.A. Kalinichenko, M.M. Bahmut, Yu.O. Alekseitsev

Keywords:

Synthetic nanomagnetite, Biogenic nanomagnetite, ferromagnetic resonance, nanocrystals, anomalous dynamic effects

Head of the research:

Bryk Oleksandr Borysovych

Registration Card (RC):

0110U006336

Execution period of the research:

2010 - 2014