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    Wyświetlanie 1-3 z 3
    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:
    Magnesium silicate conjugated with calcium lignosulfonate: In situ synthesis and comprehensive physicochemical evaluations
    Autorzy:
    Klapiszewski, Ł.
    Zietek, J.
    Ciesielczyk, F.
    Siwinska-Stefanska, K.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/109651.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biopolymers
    hybrid materials
    synthetic magnesium silicate
    calcium lignosulfonate
    in situ sol-gel route
    Opis:
    The aim of this study was to effectively combine synthetic magnesium silicate with the lignin-derived biopolymer calcium lignosulfonate, using the in situ sol-gel route. Magnesium ethoxide and tetraethoxysilane were used as precursors of MgO and SiO2. The synthesis was carried out in alcoholic solution with the addition of ammonia solution as a promoter of hydrolysis. Calcium lignosulfonate was introduced to the reaction medium prior to the synthesis of magnesium silicate. The resulting hybrid powder material was thoroughly characterized, including morphology and particle sizes (SEM microscopy and the DLS technique), porous structure parameters (the BET method and BJH model), thermal stability (TG analysis) and electrokinetic stability (LDV measurements). FTIR spectral analysis was carried out to confirm the effectiveness of the proposed synthesis methodology. Based on the results, a mechanism is proposed for the MgSiO3/lignosulfonate interactions. The resulting novel type of hybrid material combines the multifunctional nature of the biopolymer (diversity of functional groups) with the well-developed porous structure of synthetic magnesium silicate. Its physicochemical parameters were found to depend significantly on the quantity of lignosulfonate used in the synthesis.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 793-802
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of calcination parameters on physicochemical and structural properties of co-precipitated magnesium silicate
    Autorzy:
    Ciesielczyk, F.
    Bartczak, P.
    Klapiszewski, L.
    Paukszta, D.
    Piasecki, A.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110710.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    magnesium silicate
    precipitation
    calcination
    WAXS
    porous structure
    Opis:
    Physicochemical properties of different oxide systems depend mostly on the method of their preparation and classification, so the main aim of the study was to obtain the MgO·SiO2 hybrid in an aqueous solution and its calcination under assumed conditions. Research scope included evaluation of the effect of the basic parameters of the calcination process (time and temperature) on the structural properties of the final materials. Products obtained by the proposed method were thoroughly characterized. The chemical composition, crystalline structure, morphology and nature of the dispersion as well as parameters of the porous structure were established. The results of research in a decisive manner confirmed the possibility of designing the properties of inorganic oxide systems such as MgO·SiO2, which will definitively scheduled into potential directions for their use.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 119-129
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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