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    Wyświetlanie 1-3 z 3
    Tytuł:
    Fractal Features and Structural, Morphological, Optical Characteristics of Sol-Gel Derived Silica Nanoparticled Thin Films
    Autorzy:
    Uysal, B.
    Pekcan, Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029990.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    fractal dimension
    silica
    sol-gel method
    size-dependence
    thin films
    Opis:
    Nanostructured silica films using a simple and effective sol-gel spin coating technique were synthesized and the influence of ammonia/sol ratios on the particle size and thickness of this film was investigated. In addition, fractal dimensions of the prepared films were determined using the scattering response technique. The samples were characterized by atomic force microscopy and UV-vis spectroscopy. Comparing optical method and image analysis of atomic force microscopy micrographs, the fractal dimension of silica nanoparticled thin films was determined. The fractal dimensions of the films verified by atomic force microscopy analysis were found to be around 2.03 which is very close to the values (2.0358, 2.0325, and 2.0335) obtained using optical method. As a result of these findings, precise determination of the nanoparticled silica thin films fractal dimension using both optical and surface analysis methods was realized.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1160-1164
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elasticity Study of PAAm-κ C Composite Prepared in Various κ C Content and Measured at Several Temperatures
    Autorzy:
    Evingür, G.
    Pekcan, Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401880.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.de
    81.05.Mh
    07.20.Dt
    Opis:
    Polyacrylamide (PAAm)-kappa carrageenan (κC) composite gels were prepared via free radical crosslinking copolymerization with various (w/v) percentages of κC in the range between 0.5 and 3 (w/v)% of κC. Elasticity properties such as stress, strain and compressive elastic modulus, S of these composite gels were studied in various κC content and at several temperatures. The content and temperature dependence of the compressive elastic modulus, S of the swollen PAAm-κC composite gels due to volume phase transition were produced by using tensile testing technique. It is understood that the compressive elastic modulus was found to decrease up to 1 (w/v)% of κC, and then increase by increasing κC contents, at constant temperatures. The composite preserves the ability to undergo the volume phase transition and its compressive elastic modulus is found to be strongly dependent on the κC content and temperature. It is observed that the compressive elastic modulus increased when temperature is increased up to 40°C and then decreases below this temperature for all composite gels. However, PAAm-κC composite gel presented lower values for the compressive elastic modulus, showing a minima at 40°C for 1 (w/v)% of κC content gel.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 331-335
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PAAm-Kappa Carrageenan Composites: Drying and Swelling with Various Kappa Carrageenan Contents
    Autorzy:
    Akin Evıngür, G.
    Pekcan, Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490972.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.35.Lr
    83.80.Kn
    87.15.Vv
    87.15.Zg
    87.64.kv
    Opis:
    The purpose of this study is to discuss the role of kappa-carrageenan (κ-car) in the drying and swelling of polyacrylamide (PAAm)-κ-car composite. The fluorescence intensity of pyranine increased and decreased as drying and swelling time were increased respectively for all samples. The desorption coefficient, $D_{d}$, decreased as κ-car contents were increased for a given temperature during drying. However, cooperative diffusion coefficient, $D_{s}$, increased as κ-car contents were increased during swelling at a given temperature.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 169-171
    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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