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    Wyświetlanie 1-3 z 3
    Tytuł:
    Preparation of yttrium citrate by the reaction of yttrium hydroxide with sodium citrate
    Autorzy:
    Janusz, Władysław
    Skwarek, Ewa
    Sternik, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1450116.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    yttrium citrate synthesis
    CHN
    TGA
    particle size
    Opis:
    A method of obtaining yttrium citrate by transformation of freshly precipitated yttrium hydroxide in the solutions of sodium citrate under hydrothermal conditions has been proposed. To determine the synthesis time, transformation kinetics consisted in by taking the solid samples for the C and H contents analysis after 6, 12, 24, 48 and 72 hours of synthesis. Simultaneously these samples were subjected to the thermogravimetric analysis. As follows from the thermogravimetric analysis adsorption of citrate dihydrate on yttrium hydroxide is observed in the initial period up to 24 hours. Later the yttrium citrate dihydrate is formed. The thermogravimetric analysis of the final product i.e. amorphous yttrium citrate showed that the decomposition/oxidation of the sample occurs in six stages the particle size analysis method of static light scattering showed that 45% of the particles had a diameter of 0.1-0.9 µm and 55% of particles with sizes from 0.9 to 5 µm.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 51--59
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superhydrophobic MWCNTs/PDMS-nanocomposite materials: Preparation and characterization
    Autorzy:
    Sulym, Iryna
    Kubiak, Adam
    Jankowska, Katarzyna
    Sternik, Dariusz
    Terpilowski, Konrad
    Sementsov, Yuriy
    Borysenko, Mykola
    Derylo-Marczewska, Anna
    Jesionowski, Teofil
    Powiązania:
    https://bibliotekanauki.pl/articles/110293.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    poly(dimethylsiloxane)
    carbon nanotubes
    polymer nanocomposites
    superhydrophobicity
    Opis:
    The surface morphology, structure and hydrophobicity of low-and high-molecular weight poly(dimethylsiloxane) (PDMS) fluids physically adsorbed onto multi-walled carbon nanotubes (MWCNTs) at different weight percentages (5, 10, 20 and 40 wt.%), were studied employing X-ray diffraction (XRD), attenuated total reflectanceFouriertransforminfrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM) and measurements of contact angle with water. It was found that MWCNTs agglomerate forming voids between tubes of a broad range, while adsorption of the polymer from a hexane solution results in the expected wrapping of nanotubes withPDMS chains and, further, in filling voids, as represented by SEM data. ATR-FTIR was used to investigate the possible structural changes in the polymer nanocomposites. Based on the contact anglemeasurementsvia water drop shape analysis,MWCNTs/PDMS nanocomposites were characterizedas astable,superhydrophobic materials with the maximum contact angle (CA) equal to 152°at CPDMS=40wt.%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1394-1400
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of aluminosilicate-supported nickel and iron oxides nanocomposites in gaseous and aqueous media
    Autorzy:
    Goncharuk, Olena
    Dyachenko, Alla
    Skwarek, Ewa
    Ischenko, Olena
    Andriyko, Lyudmila
    Borysenko, Mykola
    Sulym, Iryna
    Sternik, Dariusz
    Kowalska, Klaudia
    Marynin, Andrii
    Powiązania:
    https://bibliotekanauki.pl/articles/2146949.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oxide nanocomposites
    NiO/FexOy
    textural properties
    particle size distribution
    Opis:
    A series of mixed oxides was synthesized by deposition of a guest phase on a highly dispersed oxide matrix. Fumed nanooxides SiO2, Al2O3, SiO2/Al2O3, and SiO2/Al2O3/TiO2 with the specific surface area of 65-91 m2/g were selected as highly dispersed matrices. NiO/FexOy was deposited as a guest oxide using solvate-stimulated modification of a surface of fumed nanocarriers with nickel nitrate and iron(III) formate and subsequent heat treatment up to 600 °C to form NiO/FexOy. The aim of this work was to study the influence of the composition and structure of fumed oxide matrices and deposited guest phase on the behavior of the composites in gaseous and aqueous media using XRD, nitrogen adsorption and SEM/EDX, and quasi-elastic light scattering (QELS) methods. The lowtemperature nitrogen adsorption isotherms have a sigmoid shape with a narrow hysteresis loop characteristic of mesoporous materials. The specific surface area of composites varies from 65 to 120 m2/g. SEM data show denser aggregate structure of nanocomposites compared to the initial carriers. The primary particle size was in the 30-60 nm range. According to QELS data, there is a tendency to form aggregates of 100 nm - 10 µm in size in the aqueous media. The XRD method shows that the deposited metal oxides are in the form of crystalline phases of NiO with crystallites of 7-23 nm in size, but the iron oxide reflexes were not identified for NiO-containing composites.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 144375
    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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