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    Wyświetlanie 1-5 z 5
    Tytuł:
    A Study on Discharge Characteristics by Using MF and RF Power in Remote Dielectric Barrier Discharge
    Autorzy:
    Kim, D.
    Shim, Y.
    Kim, H.
    Han, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398758.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.Bn
    Opis:
    We have developed an atmospheric pressure plasma apparatus of remote dielectric barrier discharge (RDBD) applicable for a large area. We have systematically studied the characteristics of medium frequency (MF, 40 kHz) and radio frequency (RF, 13.56 MHz) discharge using an optical emission spectroscope. Nitrogen (N₂) and argon (Ar) gases were used in the MF and RF discharge excitation, respectively, in a mixture with clean dry air (CDA). The peak of oxygen radical (O*₂) appears at 259.3 nm when the RDBD is employed. Furthermore, intensive peaks are observed at gas ratios of N₂:CDA=100:1 in MF excitation and at gas ratios of Ar:CDA=70:0.5 in RF discharge excitation. On the other hand, the contact angle shows about 5° in PET samples after the RDBD treatment using the RF and MF discharge excitation. Surface analyses of polyethylene terephthalate (PET) samples were carried out using an atomic force microscope and X-ray photoelectron spectroscope.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 707-710
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulations of Si and $SiO_{2}$ Etching in $SF_{6}+O_{2}$ Plasma
    Autorzy:
    Knizikevičius, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538692.pdf
    Data publikacji:
    2010-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.Bn
    81.65.Rv
    Opis:
    The plasma chemical etching of Si and $SiO_{2}$ in $SF_{6}+O_{2}$ plasma is considered. The concentrations of plasma components are calculated by fitting the experimental data. The derived concentrations of plasma components are used for the calculation of Si and $SiO_{2}$ etching rates. It is found that the reaction probabilities of F atoms with Si atoms and $SiO_{2}$ molecules are equal to ε = (8.75 ± 0.41) × $10^{-3}$ and ε = (7.18 ± 0.45) × $10^{-5}$, respectively. The influence of $O_{2}$ addition to $SF_{6}$ plasma on the etching rate of Si is determined.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 3; 478-483
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Surface Modification by Ammonia Plasma on Vascular Graft: PET Film and PET Scaffold
    Autorzy:
    Öteyaka, M.
    Chevallıer, P.
    Robıtaılle, L.
    Laroche, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490918.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.40.-w
    52.77.Bn
    52.77.Fv
    52.80.Pi
    Opis:
    Nowadays, poly (ethylene terephthalate) (PET) textiles, either knitted or woven, are largely used as substitutes for replacement of medium and large calibre (10-40 mm) arteries. Unfortunately, these substitutes do not perform well when they are used to replace small diameter arteries due to thrombogenicity and compliance mismatch issues. Surface treatments were often used as the first step to solve thrombogenicity issues. For example, low pressure ammonia plasma processes can provide modification of the top ≈ 10 - 50 Å of polymer surface without affecting bulk properties of materials. This work compared ammonia plasma surface modifications of PET film (flat surface) and PET scaffolds (porous surface). Plasma treatments lead to a higher amount of nitrogen as well as amino groups on scaffolds compared to films. N/C maximum was reached for PET film and scaffold after plasma treatments of 5 s and 100 s, respectively. Highest amine concentration on films and scaffolds were obtained at short treatment time, specifically 1 s. In addition, high resolution spectra of C 1s confirmed that amino groups were mainly grafted on aromatic rings. Nodule formation was observed after plasma treatment with atomic force microscopy. Their size and shape increased with longer treatment time.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 125-127
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic Force Microscopy and Quartz Crystal Microbalance Study of the Lectin-Carbohydrate Interaction Kinetics
    Autorzy:
    Lebed, K.
    Kulik, A. J.
    Forró, L.
    Lekka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047270.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.Dz
    84.37.+q
    87.15.Kg
    82.37.Np
    81.65.Cf
    52.77.Bn
    Opis:
    Two analytical methods, atomic force microscopy and quartz crystal microbalance, were applied to the study of the reaction kinetics occurring between concanavalin A and carboxypeptidase Y, presenting the specific lectin-carbohydrate recognition. The dissociation rate constants for concanavalin A-carboxypeptidase Y complex obtained using both atomic force microscopy and quartz crystal microbalance were of the same order of magnitude: k$\text{}_{diss}$=0.170± 0.060 s$\text{}^{-1}$ and k$\text{}_{diss}$=0.095±0.002 s$\text{}^{-1}$, respectively. In addition, each method alone aided in determining other parameters characterizing the studied interaction. Quartz crystal microbalance permitted us to estimate the association rate (k$\text{}_{ass}$=(5.6 ±0.1)×10$\text{}^{4}$ M$\text{}^{-1}$ s$\text{}^{-1}$) and the equilibrium (K$\text{}_{a}$=(0.59×0.01)×10$\text{}^{6}$ M$\text{}^{-1}$) constants for the binding process occurring between concanavalin A and mannose residues of carboxypeptidase Y under given experimental conditions. Atomic force microscopy in force spectroscopy mode enabled the determination of the energy barrier position of r=2.29±0.04 Å characterizing the dissociation of concanavalin A- carboxypeptidase Y molecular complex. The presented results show that both atomic force microscopy and quartz crystal microbalance can be used to determine quantitative parameters characterizing the specific molecular interaction. Both methods can be easily combined for complementary and/or alternative studies of a chosen molecular interaction. By preparing the samples in the same manner the direct comparison between the data obtained via atomic force microscopy and quartz crystal microbalance can be made.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 273-286
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion and Electron Beam Induced Luminescence οf Rare Earth Doped YAG Crystals
    Autorzy:
    Gawlik, G.
    Sarnecki, J.
    Jóźwik, I.
    Jagielski, J.
    Pawłowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504113.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Hk
    52.59.Bi
    79.20.Rf
    61.80.Lj
    41.75.Ak
    41.75.Cn
    61.72.S-
    61.72.-y
    29.40.-n
    77.84.Bw
    79.60.Ht
    87.53.Bn
    78.55.-m
    78.60.-b
    77.55.Px
    77.55.-g
    25.40.Lw
    Opis:
    The aim of this work was the evaluation of ion-beam induced luminescence for the characterization of luminescent oxide materials containing rare earth elements. The yttrium aluminium garnet epilayers doped with Nd, Pr, Ho, and Tm atoms were used. The ion-beam induced luminescence spectra were excited using 100 keV $H_2^{+}$ ion beam and were recorded in the wavelengths ranging from 300 nm up to 1000 nm. The separate parts of the surface of the same samples were used for ion-beam induced luminescence and cathodoluminescence experiments. Cathodoluminescence spectra have been recorded in the range from 370 nm up to 850 nm at 20 keV e-beam in scanning electron microscope equipped with a grating spectrometer coupled with a photomultiplier. The observed narrow ion-beam induced luminescence lines can be ascribed to the well known radiative transitions in the rare-earth ions in the YAG crystals. The cathodoluminescence spectra reveal essentially the same emission lines as ion-beam induced luminescence. The decrease of the ion-beam induced luminescence lines intensity has been observed under the increasing ion fluences. The ion-beam induced luminescence may be used for characterization of transparent luminescent materials as an alternative method for cathodoluminescence and can be especially useful for observation of ion-beam damage formation in crystals.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 181-183
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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