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    Wyświetlanie 1-4 z 4
    Tytuł:
    Modified and unmodified zinc oxide as coagent in elastomer compounds
    Autorzy:
    Kołodziejczak-Radzimska, A.
    Jesionowski, T.
    Maciejewska, M.
    Zaborski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779145.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    zinc oxide
    maleic acid
    emulsion precipitation
    modification
    elastomers
    vulcanizates
    Opis:
    The aim of this work was to study the activity of unmodifi ed and modifi ed ZnO in the peroxide crosslinking of hydrogenated acrylonitrile-butadiene elastomer (HNBR) and ethylene-propylene copolymer (EPM). In the fi rst step, zinc oxide was obtained by emulsion precipitation. Maleic acid was introduced onto the surface of ZnO Rusing an in situ method. The unmodified and modified zinc oxide was characterized using dispersive and morphological analysis, BET surface area analysis, and elemental, spectroscopic and thermal analysis. In the second stage of the research, the ZnO/MA systems were incorporated into the structure of elastomer compounds improving the kinetic and mechanical properties of vulcanizates. The proposed modification method had a favorable effect on the physicochemical properties of the zinc oxide and on the kinetic and mechanical properties of the vulcanizates. This study demonstrated that modification of zinc oxide by maleic acid is a promising technique.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 3; 63-68
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    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:
    Synthesis and characterization of hydroxyapatite/chitosan composites
    Autorzy:
    Szatkowski, T.
    Kołodziejczak-Radzimska, A.
    Zdarta, J.
    Szwarc-Rzepka, K.
    Paukszta, D.
    Wysokowski, M.
    Ehrlich, H.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/109806.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydroxyapatite
    chitosan
    composite
    one-step co-precipitation
    Opis:
    Hydroxyapatite (HAp)/chitosan (CS) composites were synthesized via a one-step co-precipitation method from aqueous solution, with the use of calcium chloride (CaCl2) and disodium hydrogen phosphate (Na2HPO4). CS was obtained via partial deacetylation of chitin with the use of strong sodium hydroxide solution. Composites were prepared with various HAp/CS ratios (30/70, 50/50, 70/30, 85/15) for comprehensive comparison of their properties. Fourier Transform Infrared Spectroscopy (FT-IR) analysis showed that hydrogen bonds were formed between the organic matrix and the mineral compound, confirming a successful phase interconnection. X-ray diffraction patterns were obtained, enabling examination of the crystalline properties of the composites, including HAp identification. The porous structure parameters of the composites were investigated, and morphological analysis (SEM) was performed. Differential Thermal Gravimetry (DTG) analysis of the composites indicated that the material is thermally stable up to 200 oC. Additionally, Energy Dispersive Spectroscopy (EDS) analysis of the mineral was carried out to check the Ca/P ratio, and confirmed its similarity to pure HAp.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 575-585
    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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