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Wyświetlanie 1-3 z 3
Tytuł:
Application of atomic force microscopy for studies of fractal and functional properties of biomaterials
Autorzy:
Kulesza, S.
Bramowicz, M.
Czaja, P.
Jabłoński, R.
Kropiwnicki, J.
Charkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1075857.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.30.Bp
68.37.Ps
68.35.bd
81.05.Bx
87.85.J-
Opis:
The paper presents results of numerical analysis of AFM images of a surface of sandblasted Ti6Al7Nb alloys before and after wet etching procedure usually used for preparing commercially viable dental implants. Obtained results demonstrate that etching procedure efficiently cleans the implants as it leaves almost pure Ti-Al-Nb surface with trace amounts of alkali metals and increased hydrophobicity. Apart of that, it turned out that simple statistical measures of the height variations (root mean square roughness) only slightly change upon the treatment procedure, especially for scan lengths below 20 μm. On the other hand, correlation analysis exhibits bifractal surface patterns composed of regular residues left on otherwise helical ridges of the base material. Etching leaves its fingerprint in fractal dimension, but not in the corner frequency.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1013-1015
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and Microstructure of the Al-Multilayer Graphene Composites Achieved by the Intensive Deformation
Autorzy:
Czeppe, T.
Korznikova, E.
Ozga, P.
Wrobel, M.
Litynska-Dobrzynska, L.
Korznikova, G.
Korznikov, A.
Czaja, P.
Socha, R.
Powiązania:
https://bibliotekanauki.pl/articles/1375203.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.05.uj
81.05.ue
81.05.uf
Opis:
The paper presents results of the studies concerning aluminum-graphene composites produced with use of step technique; first mechanical alloying of Al and graphene powders and later intensive deformation by the high pressure torsion. As a result small, thin and round samples of composites, about 10 mm in diameter were achieved. For comparison similar samples not containing graphene were investigated. The X-ray diffraction, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy were applied to study composites structures and analyze graphene content and atomic bonds. The Raman spectroscopy method suggested multilayer graphene, which could also be identified as the defected nano-graphite as a component of the composite structure as well as some small content of the aluminum carbides. The highly dispersed microstructures of aluminum matrices were identified with the transmission electron microscopy, showing difference between the samples produced with the increased number of rotations, leading to the increased deformation realized. This method revealed carbon and aluminum oxides in large amounts which is interpreted as a surface effect. This method suggested also formation of the carbon-metal and carbon-metal- oxygen atomic bonds, which might partially result from formation of the carbides.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 921-927
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Evolution of Microstructure and Magneto-structural Properties of Heat Treated Ni-Mn-Sn-In Heusler Alloys Sintered by Vacuum Hot Pressing
Autorzy:
Maziarz, W.
Wójcik, A.
Chulist, R.
Szczerba, M. J.
Kowalczyk, M.
Czaja, P.
Cesari, E.
Dutkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/947530.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-Mn-Sn metamagnetic shape memory alloys
sintering process
heat treatment
electron microscopy
Opis:
In this work, vacuum hot pressed Ni-Mn-Sn-In Heusler alloys with different concentration of In (0, 2 and 4 at.%), were investigated. The magneto-structural behaviour and microstructure dependencies on chemical composition and on heat treatment were examined. It was found that the martensite start transformation temperature increases with growing In content and to a lesser extent with increasing temperature of heat treatment. The high energy X-ray synchrotron radiation results, demonstrated that both chemical composition as well as temperature of heat treatment slightly modified the crystal structures of the studied alloys. Microstructural investigation performed by transmission electron microscopy confirmed chemical composition and crystal structure changes in the alloys.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 727-732
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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