Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Kalenczuk, R." wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-6 z 6
    Tytuł:
    Comparison of NaNbO3 and NaTaO3 as the photocatalysts in the reaction of hydrogen generation
    Autorzy:
    Zielińska, B.
    Kaleńczuk R., J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779228.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    NaNbO3
    NaTaO3
    fotokataliza
    wytwarzanie wodoru
    photocatalysis
    hydrogen generation
    Opis:
    The photocatalytic production of hydrogen over several chemical compounds based on sodium niobates and tantalates has been investigated. The photocatalysts have been prepared by an impregnation method of Nb2O5and Ta2O5 in the aqueous solution of sodium hydroxide and then the calcination at the temperature range of 450 – 800°C. In this report, we present the study showing that of the catalysts explored, the highest photocatalytic activity was shown in a sample obtained at the temperature of 450°C and containing NaTaO3 as a main phase.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 3; 33-35
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Silanization Processes on the Properties οf Oxidized Multiwalled Carbon Nanotubes
    Autorzy:
    Scheibe, B.
    Borowiak-Palen, E.
    Kalenczuk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807640.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Mq
    81.07.De
    61.48.De
    65.80.-g
    68.37.Lp
    Opis:
    This paper presents the results of the research on the effect of the two different silanization methods on the thermal and structural properties of oxidized multiwalled carbon nanotubes. As-purified material was oxidized in the mixture of nitric and sulfuric acids. An oxidized material was divided into two parts which underwent two silanization treatments by 3-aminopropyltriethoxysilane (APTES). The first experiment (I) was performed at room temperature in acetone (pH 7) for 30 min. The second experiment (II) involved a hydrolysis of APTES at 40°C in water (pH 4) for 3 h. The functionalization extent of the samples at each step of the preparation was investigated by the Raman spectroscopy. The presence of the functional groups on the nanotubes surface have been studied via the Fourier transform infrared spectroscopy (FT-IR). The quantity of the external moieties introduced on multiwalled carbon nanotubes surface after oxidation process was estimated by the Boehms titration method. The high resolution transmission electron microscopy analysis allowed us to observe the changes of the morphology of the investigated carbon nanotubes. The influence of the silanization processes on the thermal stability of multiwalled carbon nanotubes was thoroughly studied by thermogravimetry analysis. There was observed a significant increase of the thermal stability of the multiwalled carbon nanotubes samples upon silanization treatment in respect of pristine and oxidized multiwalled carbon nanotubes.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-150-S-155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic hydrogen generation over alkali niobates in the presence of organic compounds
    Autorzy:
    Zielińska, B.
    Sreńscek-Nazzal, J.
    Kaleńczuk, R.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779439.pdf
    Data publikacji:
    2008
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    otrzymywanie wodoru
    niobiany alkaliczne
    fotokataliza
    hydrogen generation
    alkali niobates
    photocatalysis
    Opis:
    The photocatalytic efficiency of alkali niobate-based compounds (Li, Na, K) for hydrogen generation has been investigated. The systematic study showed that the highest photocatalytic activity was observed in the case of Na/Nb2O5 catalyst which contained sodium niobate (NaNbO3) phase and that the most efficient electron donor for hydrogen generation was formic acid. In addition, the effect of organic donor (HCOOH) concentration on the amount of the evolved hydrogen was studied.
    Źródło:
    Polish Journal of Chemical Technology; 2008, 10, 4; 1-3
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PANI/NaTaO3 composite photocatalyst for enhanced hydrogen generation under UV light irradiation
    Autorzy:
    Zielińska, B.
    Schmidt, B.
    Mijowska, E.
    Kaleńczuk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778752.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    polyaniline
    NaTaO3
    composite photocatalysts
    hydrogen generation
    Opis:
    A PANI/NaTaO3  composite was successfully synthesized by an oxidative polymerization of aniline monomer in hydrochloric acid solution containing sodium tantalate. NaTaO3  at a monoclinic structure was produced via hydrothermal method. The photocatalytic activities of the unmodified NaTaO3  and PANI/NaTaO3  were evaluated for hydrogen generation from an aqueous HCOOH solution and under UV light irradiation. The results showed that the evolution rate of H2  increased significantly when NaTaO3  was modified with PANI. The enhancement of the photocatalytic activity of PANI/NaTaO3  composite was ascribed to the effective charge transfer and separation between NaTaO3  and PANI, which reduced their recombination. This indicates that PANI modification of tantalate photocatalysts may open up a new way to prepare highly efficient catalytic materials for H2  generation.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 3; 115-119
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of carbon nanotubes via chemical vapor deposition by using rareearth metals as catalysts
    Autorzy:
    Jędrzejewska, A.
    Wnuk, K.
    Kaleńczuk, R. J.
    Borowiak-Paleń, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/779342.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nanorurki węglowe
    chemiczne osadzanie CVD
    spektroskopia Ramana
    transmisyjna mikroskopia elektronowa
    carbon nanotubes
    chemical vapor deposition (CVD)
    Raman spectroscopy
    transmission electron microscopy
    Opis:
    This work presents the results of the synthesis of carbon nanotubes using the CVD method. Fe:MgO catalyst was used, also in combination with rare earth elements (gadolinium (Gd), dysprosium (Dy)), which when used alone, are not efficient as catalysts in nanotube growth. Synthesis was performed both at reduced pressure (10-3 mbar) and atmospheric pressure, with constant parameters dependent on the process parameters.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 3; 29-32
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-walled carbon nanotubes fractionation via electrophoresis
    Autorzy:
    Scheibe, B.
    Lukaszczuk, P.
    Rümmeli, M. H.
    Kalenczuk, R. J.
    Borowiak-Palen, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/778838.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    SWCNTs
    sole diazoniowe
    frakcjonowanie
    elektroforeza
    diazonium salts
    fractionation
    electrophoresis
    Opis:
    This work presents the influence of the sonication time on the efficiency of the metallic/semiconducting (M/S) fractionation of diazonium salt functionalized single-walled carbon nanotubes (SWCNTs) via free solution electrophoresis (FSE) method. The SWCNTs synthesized via laser ablation were purified from amorphous carbon and catalyst particles through high vacuum annealing and subsequent refluxing processes in aqua regia solutions, respectively. The purified material was divided into two batches. The SWCNTs samples were dispersed in 1% SDS solution in ultrasound bath for 2 and 12 hours. Both dispersed SWCNTs samples were functionalized with p-aminobenzoic acid diazonium salt and fractionated via free solution electrophoresis method. Afterwards, the fractionated samples were recovered, purified from surfactant/functionalities by annealing and investigated via UV-Vis-NIR optical absorption spectroscopy (OAS). The efficiency of the fractionation process was estimated through the comparison of the van Hove singularities (vHS) presented in the obtained fractions to the starting SWCNTs.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 3; 1-4
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies