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    Wyświetlanie 1-2 z 2
    Tytuł:
    Preparation and characterization of SiO2/silane/POSS functional hybrids
    Autorzy:
    Szwarc-Rzepka, K.
    Szatkowski, T.
    Ciesielczyk, F.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110647.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SiO2/silane/POSS hybrids
    silica support
    silsesquioxanes cage
    bifunctionalization process
    Opis:
    Novel SiO2/silane/POSS functional hybrids have been synthesized via an immobilization method. Hybrid materials were obtained through a connection of emulsion silica with defined dispersive and morphological properties with (3-isocyanatepropyl)triethoxysilane and selected mono- or octasubstituted POSS compounds in organic solvent. Modification effectiveness of the obtained SiO2/silane/POSS hybrid systems was confirmed with the use of the Fourier transform infrared spectroscopy (FTIR). In order to determine the influence of bifunctionalization on coverage degree of the selected POSS compounds, elemental analysis (C, H, N contents) was performed. Moreover, parameters of porous structure of the obtained products were determined: BET surface area, total volume and mean size of pores. During analysis the thermal stability of silsesquioxanes cage, unmodified silica support, and hybrid systems have been investigated. For this purpose dispersive and morphological characterization (particle size distribution and TEM images) was performed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 673-687
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated lignin and aminosilane-grafted silica as precursors in hybrid material production
    Autorzy:
    Klapiszewski, L.
    Szalaty, T. J.
    Zdarta, J.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951851.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SiO2/lignin hybrids
    silica
    lignin
    lignin activation
    thermal stability
    hybrid material
    Opis:
    Functional inorganic-organic hybrids were synthesized using as a precursor silica with the addition of an appropriate amount of lignin as components. Three types of silica were applied as the support: the commercial silicas Syloid 244 and Aerosil 200, and hydrated silica precipitated in a polar system. The silicon dioxide was initially functionalized with aminosilane to activate the surface, and then the silica-based material was combined with lignin oxidized using hydrogen peroxide. The obtained inorganic-organic hybrids underwent physicochemical and dispersive-morphological analysis, with comparison of the results depending on the composition of the test samples. In addition, particle size distributions were determined and the surface structure of the products assessed by scanning electron microscopy. The presence of functional groups was also determined by FTIR spectroscopy. The thermal analysis of the silica/lignin materials was also performed, as well as the elemental and colorimetric analyses, which indirectly confirmed the correctness of the synthesis process. Hybrid materials with the most favorable dispersive and morphological properties were obtained by adding a small amount of biopolymer. The thermogravimetric analysis of the SiO2/lignin hybrids indicated their good thermal stability. With increasing quantity of lignin per 100 parts by weight of silica matrix, progressive deterioration in the thermal stability of the materials was observed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 1; 459-478
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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