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    Wyświetlanie 1-3 z 3
    Tytuł:
    Production and Structural Investigation of Polyethylene Composites with Modified Kaolin
    Autorzy:
    Domka, L.
    Malicka, A.
    Stachowiak, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812252.pdf
    Data publikacji:
    2008-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.25.-g
    63.22.Np
    68.37.Hk
    81.07.Pr
    82.35.Np
    Opis:
    The study was undertaken to evaluate the effect of the filler (kaolin) modification with silane coupling agents on the properties of the polyethylene (HDPE Hostalen ACP 5831) composites. Powder mineral fillers are added to polymers to modify the properties of the latter and to reduce the cost of their production. A very important factor is the filler dispersion in the polymer matrix. Kaolin modified with 3-methacryloxypropyltrimethoxysilane and pure kaolin were characterised by surface area, pore size, water absorbing capacity, paraffin oil absorbing capacity, bulk density, scanning electron microscopy observations and X-ray diffraction measurements. Their performance was characterised by determination of the mechanical resistance upon static stretching and tearing, and their structure was observed in scanning electron microscopy images. The results were compared to those obtained for the composites with unmodified filler and pure HDPE.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 2; 413-421
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Poly (Divinylbenzene, Ethylene Glycol Dimethacrylate and Vinyl Alcohol) Containing Barium Ferrite Nanoparticles
    Autorzy:
    Gunes, S.
    Akay, S.
    Kara, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182839.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Rt
    75.75.Fk
    82.35.Np
    Opis:
    Three different kinds of polymer films, poly (divinylbenzene), poly (ethylene glycol dimethacrylate) and poly (vinyl alcohol), containing M-type hexagonal barium ferrites (BaFe12O19) were synthesized on glass substrates by using surface polymerization method. The structural properties were characterized by X-ray diffraction and atomic force microscopy. X-ray diffraction patterns show that polymer films have a polycrystalline structure. The magnetic measurement of polymer films were examined at room temperature using vibrating sample magnetometer and magnetic force microscopy, respectively. The magnetic measurements indicate that P(VA)-BF films exhibit higher saturation magnetization and coercive field than P(EGDMA)-BF and P(DVB)-BF films.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 538-540
    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
      Wyświetlanie 1-3 z 3

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