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23. 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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24. 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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46. Lutetium aluminate: spectroscopic and scintillation properties

Author

Lempicki, A., Brecher, C., Wisniewski, D., Zych, E., and Wojtowicz, A.J.

Subjects
Crystal optics -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The present status of the LuAl[O.sub.3]:Ce (LuAP) scintillator is reviewed and its performance compared to that of YAl[O.sub.3]:Ce (YAP). The light output of LuAP, at this stage of development, appears to be limited by two factors: insufficient Ce concentration and the presence of a parasitic absorption. Both LuAP and YAP show a dependence of light output on thickness, indicating that YAP also suffers from parasitic absorption. Measurements on undoped material offer a clue to the identity of the 'parasite'.

Published
1996

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