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    Wyświetlanie 1-4 z 4
    Tytuł:
    Synthesis and physicochemical characteristics of titanium dioxide doped with selected metals
    Autorzy:
    Siwinska-Stefanska, K.
    Paukszta, D.
    Piasecki, A.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951839.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    titanium dioxide
    sol-gel method
    doping
    TiO2 surface modification
    Fe and Co dopant
    Opis:
    The paper details with of the preparation and physicochemical characterisation of nano- and microstructured TiO2 doped with Fe and Co produced by the sol-gel method using titanium alkoxide as the precursor of titania as well as iron or cobalt nitrates as dopant sources. Fe and Co doped TiO2 materials were successfully prepared with two different methods. The effect of the dopant type on the synthesis of TiO2 powders was investigated. The physicochemical properties of the studied samples were determined. The characterisation included determination of the dispersion and morphology of the systems (particle size distribution, SEM images), characteristics of porous structure (BET isotherms), crystalline structure (XRD), surface composition (EDS), as well as thermal stability (TG/DTA).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 265-276
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of hydroxyapatite in the presence of anionic surfactant
    Autorzy:
    Kolodziejczak-Radzimska, A.
    Samuel, M.
    Paukszta, D.
    Piasecki, A.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110560.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydroxyapatite
    precipitation
    anionic surfactant
    Opis:
    Hydroxyapatite was synthesized by precipitation method using an anionic surfactant (SDS) template, at ambient temperature and normal pressure. Phosphoric acid and disodium phosphate were used as a precursor of phosphorous, whereas calcium hydroxide and chloride were used as a precursor of calcium. The obtained hydroxyapatite was subjected to a wide range of physicochemical analysis using various measurement techniques. In order to get information about the properties of the obtained products, the following analysis of characteristics was performed: dispersion (NIBS), morphological (SEM), adsorptive (BET) and structural (XRD). Energy-dispersive X-ray spectroscopy and elemental analysis were also applied.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 225-236
    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
    Tytuł:
    Hydroxyapatite as a support in protease immobilization process
    Autorzy:
    Zdarta, J.
    Budzinska, K.
    Kolodziejczak-Radzimska, A.
    Klapiszewski, Ł.
    Siwinska-Stefanska, K.
    Bartczak, P.
    Piasecki, A.
    Maciejewski, H.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110452.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydroxyapatite
    enzyme immobilization
    protease
    physicochemical characteristic
    Opis:
    Hydroxyapatite is used as a matrix for immobilization of protease from Aspergillus oryzae by a process of adsorption. The matrix obtained has the surface area of 26 m2/g and particles in the shape of flakes of diameters no greater than 650 nm. The efficiency of the proposed method was confirmed by the Fourier transform infrared spectroscopy, elemental analysis and by analysis of parameters of the pore structure of matrix and products after immobilization. On the basis of the Bradford method it was found that the greatest amount of enzyme (132 mg/g) was immobilized from a solution of initial enzyme concentration of 7 mg/cm3 after 24 h of the process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 633-646
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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