ORALS

SESSION: NanomaterialsSatPM2-R11	6th Intl. Symp. on Synthesis and Properties of Nanomaterials for Future Energy Demands
Sat Oct, 26 2019 / Room: Coralino
Session Chairs: Lucian Pintilie; Tetiana Prikhna; Session Monitor: TBA

15:55: [NanomaterialsSatPM209]
Iron Oxide Nanopowder Synthesized by Electroerosion Dispersion
Tetiana Prikhna¹ ; Mykola Monastyrov² ; Bernd Halbedel³ ; Semyon Ponomarov⁴ ; Fernand Marquis⁵ ; Athanasios Mamalis⁶ ; ¹Institute for Superhard Materials, Kiev, Ukraine; ²Open International University of Human Development Ukraine, Kiev, Ukraine; ³Technische Universitat Ilmenau, Ilmenau, Germany; ⁴Institute of Semiconductor Physics, Kiev, Ukraine; ⁵San Diego State University, San Diego, United States; ⁶National Technical University of Athens, Athens, Greece;
Paper Id: 121 [Abstract]

In this work, we present a method for simple preparation of magnetic iron oxide nanopowders by electroerosion dispersion (EED) of carbon steel in water. Magnetic nanoparticles (MNP) have attracted considerable interest in many fields of research and applied science due to their impressive properties. In the past, in order to fix biomedical issues, the development of MNPs has been promoted. For technical applications, such as wastewater treatment and absorption of electromagnetic waves, the existing synthesis approaches are too expensive and/or the producible quantities are too low. We describe the synthesis method, the laboratory installation and discuss the structural, chemical and electromagnetic properties of the syn-thetized EED powders, as well as their applicability for microwave absorption compared to other available ferrite powders. The electromagnetic properties of the EED powder allow microwave absorption values like that of hexaferrite powders and values considerably larger than that of the commercially available iron oxide powder: Magsilica. The production of the EED powder, however, is much simpler. Modern applications with high-frequency electromagnetic fields (satellite-TV, mobile funk, WLAN technologies, radar for traffic and aerial supervision, microwave heating, drying, sintering, up to automotive and medical applications) require very low-cost absorbing materials. This allows reduction of the electromagnetic radiation exposure on biological systems, assures the safe operation of instruments and equipment (prevention of wireless signal leakages) or facilitates modern communication applications [1].

References:
[1] B. Halbedel, T. Prikhna/, P. Quiroz, J. Schawohl, T. Kups, M. Monastyrov Iron oxide nanopowder synthesized by electroerosion dispersion (EED) - Properties and potential for microwave applications // Current Applied Physics. - 2018. - Vol. 18. - P. 1410-1414

SESSION: AdvancedMaterialsFriPM1-R2	5th Intl. Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development
Fri Oct, 25 2019 / Room: Leda (99/Mezz. F)
Session Chairs: Lev Rapoport; Teofilo Rojo; Session Monitor: TBA

14:00: [AdvancedMaterialsFriPM105] Keynote
Low Cost, Corrosion Resistant and Microwave-Absorbing Coatings
Tetiana Prikhna¹ ; Mykola Monastyrov² ; Fernand Marquis³ ; Viktor Moshchil¹ ; Olena Prysiazhna⁴ ; Bernd Halbedel⁵ ; Pavlo Barvitskiy¹ ; ¹Institute for Superhard Materials, Kiev, Ukraine; ²Open International University of Human Development Ukraine, Kiev, Ukraine; ³San Diego State University, San Diego, United States; ⁴Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kiev, Ukraine; ⁵Technische Universitat Ilmenau, Ilmenau, Germany;
Paper Id: 117 [Abstract]

New low cost masking coatings have been developed. These coatings are based on corrosion resistant polyurethane and acrylic-urethane priming varnishes and paints of Ukrainian manufacture (InterGasSinthez). In addition, the coatings are also based on nanopowders of polyvalent iron oxides obtained by electroerosion dispersion [1], carbon, omega spheres (based on silica and alumina), and basalt fibers demonstrating high absorption abilities (90-99%) of microwaves in a wide range of frequencies (10-70 GHz, wavelength 0,03-0,0043 m) with their reflection close to zero (-10 Db - - 23 Db or 10% -0.5%). Polymeric bases of the developed coatings are used to protect against corrosion of metal structures in all macroclimatic areas, in sea and fresh water, in saline solutions, and in oil and oil products that are resistant to ultraviolet radiation, aggressive media. They demonstrate high mechanical performance (adhesion, strength, elasticity) and long service life. The coatings can be used for painting of ships, deck structures, containers, building constructions and buildings, auto and railway transports, parts and mechanisms, etc.

References:
[1] B. Halbedel, T. Prikhna/, P. Quiroz, J. Schawohl, T. Kups, M. Monastyrov Iron oxide nanopowder synthesized by electroerosion dispersion (EED), Properties and potential for microwave applications // Current Applied Physics. - 2018. - Vol. 18. - P. 1410-1414