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    Wyświetlanie 1-7 z 7
    Tytuł:
    Influence of $Xe^{+}$ Irradiation on Topography and Wettability of Graphite Surface
    Autorzy:
    Tashlykov, I.
    Turavets, A.
    Zhukowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503997.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.uf
    61.80.-x
    68.37.Ps
    Opis:
    The investigation of influence of $Xe^{+}$ ions irradiation of graphite on its surface topography and wettability was conducted. With the increase of the irradiation dose, the roughness average increases rapidly at first (when the sample was irradiated at the dose of 1 × $10^{14} cm^{-2}$) and then decreases slowly. The atomic force microscopy three-dimensional pictures showed that after irradiation of graphite of $Xe^{+}$ ions with a dose of 3 × $10^{15} cm^{-2}$ hemispherical grains (from 0.2 to 0.8 μm in diameter) appear on its surface. Surface water contact angle measurement showed that irradiation of graphite by $Xe^{+}$ ions leads to a hydrophobic surface of graphite. We have observed that irradiation of graphite by $Xe^{+}$ ions can be used for obtaining graphite surface with desirable topography and water wettability.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 115-117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of the Electrode Surface Roughness Induced by High-Voltage Electric Pulses as Revealed by AFM
    Autorzy:
    Rodaitė-Riševičienė, R.
    Saulis, G.
    Snitka, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807928.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.80.-y
    82.45.Fk
    68.37.Ps
    Opis:
    The changes of the surface topography of stainless-steel and aluminium electrodes occurring due to the action of electric pulses which are utilized for cell electroporation, have been studied by using atomic force microscopy. The surfaces of the polished stainless-steel electrodes were smooth - the average roughness was 13-17 nm and the total roughness 140-180 nm. The total roughness of the aluminium electrodes was about 320 nm. After the treatment of the chambers filled with 154 mM NaCl solution by a series of short (20-40 μs), high-voltage (4 kV) pulses with the total dissolution charge of 0.20-0.26 A s/$cm^{2}$, the roughness of the surface of the electrodes has increased, depending on the total amount of the electric charge that has passed through the unit area of the electrode. Up to a two- and threefold increase of the surface roughness of the stainless-steel and aluminium anodes respectively was observed due to the dissolution of the anode material. Therefore, the use of high-voltage electric pulses leads to the increase of the inhomogeneity of the electric field at the electrode, which facilitates the occurrence of the electric breakdown of the liquid samples and causes non-equal treatment of each cell.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1095-1097
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Magnetic Phases in LC200N Steel by Backscattering Mössbauer Spectrometry
    Autorzy:
    Pašteka, L.
    Miglierini, M.
    Bujdoš, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030272.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Ef
    76.80.+y
    81.65.Ps
    33.45.+x
    Opis:
    In this paper we identified iron phases in three different samples of highly corrosion-resistant steel LC200N using the Mössbauer spectrometry which is particularly suited method for this purpose. Special emphasis is put upon magnetically active crystalline phases. The samples had different thermal history: (1) hardened, (2) hardened with consequent rapid quenching in liquid nitrogen, (3) non-hardened and prepared in a disc form with two sides ("as cut" and polished). Both ferritic magnetic phases and non-magnetic austenite phase were found in these samples. Relative content ratios between these phases were determined for each type of the samples and their respective sides. Higher amount of magnetic phases was found in non-hardened sample and on polished sides of all samples in general. The elemental characterization was accomplished by neutron activation analysis.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1078-1080
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependent Variations of Properties of Polymer-Like Carbon Coatings Treated with High Energy Electrons
    Autorzy:
    Plaipaitė-Nalivaiko, R.
    Vigricaitė, L.
    Adlienė, D.
    Rutkūnienė, Ž.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402232.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Fe
    68.37.Ps
    78.30.Jw
    78.70.-g
    Opis:
    Polymer-like carbon coatings can be used for the protection of micro-electromechanical devices functioning in chemically or radiation harsh environment due to their beneficial properties. Properties of carbon coatings depend on the method of synthesis, initial gas mixture, admixture of additives, temperature and other technological parameters. Modification of carbon structures is possible applying high energy electrons. Coating mechanical properties become almost stable after their pretreatment with some doses of high energy electrons. Polymer-like carbon coatings were synthesized from acetylene gas plasma on n-type silicon substrates in the RF plasmotron system at temperatures in the range 293-673 K using plasma enhanced chemical vapor deposition method. Series of samples were prepared and irradiated with high energy (6 MeV) electrons in a medical linear accelerator. The ellipsometric method was used for estimation of some optical parameters and thickness of synthesized coatings. Structural changes of polymer-like carbon coatings were evaluated using the Raman spectroscopy and surface morphology was assessed by atomic force microscopy. Electron beam induced structural changes in the coatings were analyzed using the obtained results. The relations between the synthesis temperature and samples structure and surface morphology are discussed.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 915-917
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Grain Size on Mechanical Properties of Irradiated Mono- and Polycrystalline $MgAl_2O_4$
    Autorzy:
    Jagielski, J.
    Piatkowska, A.
    Aubert, P.
    Labdi, S.
    Maciejak, O.
    Romaniec, M.
    Thomé, L.
    Jozwik, I.
    Debelle, A.
    Wajler, A.
    Boniecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503999.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Jh
    61.82.Ms
    62.20.Qp
    68.37.Ps
    Opis:
    The influence of the size of crystalline regions on mechanical properties of irradiated oxides has been studied using a magnesium aluminate spinel $MgAl_2O_4$. The samples characterized by different dimensions of crystalline domains, varying from sintered ceramics with grains of few micrometers in size up to single crystals, were used in the experiments. The samples were irradiated at room temperature with 320 keV $Ar^{2+}$ ions up to fluences reaching 5 × $10^{16} cm^{-2}$. Nanomechanical properties (nanohardness and Young's modulus) were measured by using a nanoindentation technique and the resistance to crack formation by measurement of the total crack lengths made by the Vickers indenter. The results revealed several effects: correlation of nanohardness evolution with the level of accumulated damage, radiation-induced hardness increase in grain-boundary region and significant improvement of material resistance to crack formation. This last effect is especially surprising as the typical depth of cracks formed by Vickers indenter in unirradiated material exceeds several tens of micrometers, i.e. is more than hundred times larger than the thickness of the modified layer.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 118-121
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Excess Silicon on 6H-SiC(0001) during Hydrogen Etching
    Autorzy:
    Grodzicki, M.
    Wasielewski, R.
    Surma, S.
    Ciszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807513.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Cf
    81.15.Gh
    72.80.Jc
    79.60.Dp
    68.37.Ps
    Opis:
    The surface of 6H-SiC(0001) samples was subjected to etching under $H_{2}$/Ar gas mixture in a cold-wall tubular furnace. Its topography and properties were characterized by atomic force microscopy and X-ray photoelectron spectroscopy before and after hydrogen etching. The conditions have been found, under which surface polishing-related damages could be removed. Si droplets were observed under certain etching conditions. The effect of the samples' cooling rate on the obtained surface morphology and chemistry was investigated to unveil the mechanism of Si recrystallization onto the crystal surface upon etching.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-82-S-85
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Micromechanics Investigation of Wood Cell Walls under Compression Loading
    Autorzy:
    Günay, E.
    Golmohammadi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398697.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.gp
    87.17.Rt
    83.80.Lz
    68.37.Ps
    02.70.Dh
    87.16.Gj
    Opis:
    The aim of this study was to detect the determinations of the 3D cell deformations of pine wood (Pinus sylvestris L.) in micro-scale(µm) under mechanical compression loading. The 20× 20× 50 mm³ sized wood specimens were tested under compressive pressure load through 35-40 MPa parallel to the grain orientations. The pressure applied samples were divided into three parts, then processed to form smaller cubic pieces and this pieces stained with gold liquid in order to get scanning electron microscopy images (12× 12× 12 mm^3 parts). The deformed cells were photographed in 3D-plane with magnification of (100×), (1500×) and in the range of 3.0-5.0 kV light voltage under the scanning electron microscope. Unloaded and loaded pine wood specimens were visualized and photographed to observe and examine the contraction or expansion of the cell walls comparatively. Based on the experimentally obtained microstructural permanent deformations of the cell structures, a numerical model had been proposed to explain the complex behaviour of cell structures under compression loading. Using the finite element method and ANSYS code, the permanent deformation ratios of three different pinewood cell models were simulated for 35-40 MPa loading to explain the overall stiffness and strength of the pinewood cells. In this way, by considering the results obtained from scanning electron microscopy measurements and related finite element analysis solutions, permanent deformation of honeycomb type pinewood cells was examined in detail.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 459-463
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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