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227 results on '"Zych, E."'

24. NONWOVEN CARBON FIBERS WITH NANOMETRIC METALLIC LAYERS AS A TOOL TO MONITOR REGENERATIVE PROCESSES.

Author

STODOLAK-ZYCH, E., KUDZIN, M., KORNAUS, K., GUBERNAT, M., KANIUK, E., and BOGUN, M.

Subjects
*ENERGY dispersive X-ray spectroscopy, *IRON, *MAGNETRON sputtering, *SCANNING electron microscopes, *REGENERATION (Biology), *CARBON fibers
Abstract

Still unsolved is the problem of monitoring the tissue regeneration with the use of implants (substrates) in in vivo conditions. The multitude of implant materials combined with their specific immanent often limit standard diagnostic methods, i.e. X-rey or computer tomography (CT). This is particularly difficult in therapies using polymeric high-resistance substrates for tissue engineering. The aim of this study was to fabricate a non-woven carbon fiber composed of carbon fibers (CF) which were then subjected to a surface modification by magnetron sputtering. A layer of iron (Fe) was applied under inert conditions (argon) for different time periods (2-10 min). It was shown that already after 2-4 minutes of iron sputtering, the voxel surface (CF_Fe2', CF_Fe4') was covered with a heterogeneous iron layer observed by scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDS). The longer the modification time, the more uniform the layer on the fiber surface becomes. This can be seen by the change in the wettability of the nonwoven surface which decreases from 131° for CF_Fe2 to 120° for CF_Fe10. The fibers do not change their geometry or dimensions (~11.5 um). The determination of pore size distribution by adsorption and desorption techniques (BJH) and specific surface area by nitrogen adsorption method (BET) have shown that the high specific surface area for the CF_Fe2' fibers decreases by 10% with the increasing iron sputtering time. All the studied CF_Fe fibers show good biocompatibility with osteoblastlike cells MG-63 cells after both 3 and 7 days of culture. Osteoblasts adhere to the fiber surface and show correct morphology. [ABSTRACT FROM AUTHOR]

Published
2023
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25. PAN-BASED CARBON FIBERS DEPOSITION ON NiTi SURFACE.

Author

GORYCZKA, T., SZARANIEC, B., STODOLAK-ZYCH, E., and KLUSKA, S.

Subjects
PAN-based carbon fibers, NICKEL-titanium alloys, SCANNING electron microscopes, COATING processes
Abstract

The main objective of the work was to create a layer of carbon nanofibre on the surface of the NiTi shape memory alloy. The coating process was carried out in three stages. First, polyacrylonitrile was deposited by electrospinning. Then it was stabilized at temperatures up to 250°C. The last stage was the carbonization performed below 1000°C. The microstructure of the obtained coatings was observed using a scanning electron microscope. The X-ray diffraction techniques were applied to analyze the coating structure. After the polyacrylonitrile deposition, the fibers had an average diameter of about 280 nm, and the final fibers were almost twice as tiny. The applied steps also changed the phase and crystalline state of the fibers, finally leading to the formation of amorphous-nanocrystalline graphite. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Temperature dependence of 4fn−15d1→4fnluminescence of Ce3+and Pr3+ions in Sr2GeO4host

Author

Fiaczyk, K., Omagari, S., Meijerink, A., Zych, E., Sub Condensed Matter and Interfaces, and Condensed Matter and Interfaces

Subjects
d→f luminescence, Ce3 +, Pr3 +, Thermal quenching, Strontium germanate
Abstract

© 2018 Elsevier B.V. Photoluminescence of Ce3+- and Pr3+-activated Sr2GeO4powders was measured between 17 and 600 K. For both ions strong 4fn−15dn→4fn(d-f) emission is observed at low temperatures, around 410 nm (Ce3+) and 280 nm (Pr3+). The Ce3+d-f emission quenches starting at 150 K and disappearing completely just above room temperature. Pr3+d-f luminescence shows an onset of quenching also around 150 K and disappears completely between 250 and 300 K. For Pr3+quenching of the d-f emission was connected with an increasing intensity of the3P0luminescence at first and1D2emission at even higher temperatures. Both these 4fn→4fnemissions were observed up to 600 K. Based on the similar quenching temperatures, thermally stimulated photoionization of the 5d electrons from 5d level of Ce3+or Pr3+to the conduction band is proposed as the most probable mechanism for quenching of the d-f emissions.

Published
2018

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