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    Wyświetlanie 1-10 z 10
    Tytuł:
    Thermally Stimulated Electron Emission from K-Bi-GICs
    Autorzy:
    Chrzanowski, J.
    Klimkiewicz, R.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968867.pdf
    Data publikacji:
    1998-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Tx
    79.75.+g
    79.20.Kz
    Opis:
    The results of the investigations of thermally stimulated electron emission from graphite submitted to intercalation of K-Bi alloy, in the temperature range of 100-400 K, are presented. Total and partial pressure in the measuring chamber in relation to the temperature of the sample are also reported. The insertion of a K-Bi alloy into the interlayers of graphite considerably changes thermally stimulated electron emission properties. The emission images I(T) depend on the content of intercalate and the emission maxima obtained at temperatures of about 170 and 210 K are conditioned by the desorption of a gas while the total pressure above the different samples is of the same order. The desorption of gases at a temperature over 250 K does not cause any increase in the electron emission.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 3; 531-537
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of selenium diet supplement
    Autorzy:
    Grzechulska-Damszel, J.
    Markowska-Szczupak, A.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/777921.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    selenium supplementation
    chemical analysis
    microbial analysis
    stability
    Opis:
    Selenium is one of the trace elements playing a crucial role in a proper function of living organisms. Selenium intake varies, largely based on the selenium content of food. The daily Se intake recommended for adults amounts to 55 μg per day. The mean level of selenium in the population varies considerably between countries. Recent studies on the selenium dietary intakes in Poland showed that it is not sufficient to meet the daily requirement for this microelement so it is strongly recommended to employ selenium supplementation. The commercial product SEL-BRCA1®  being a selenium diet supplement was subjected to chemical and microbial analysis to determine its stability in storage time and conditions. Basing on the obtained results it can be stated that the stability of studied supplement, stored in the closed bottles, can be confirmed for the period of time up to 45 months after the production date and it is not recommended to store opened bottles for the period of time longer than 12 months. The studied supplement showed a very high microbial stability what underscores its usefulness as human medicines.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 84-87
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New photocatalyst for decomposition of humic acids in photocatalysis and photo-Fenton processes
    Autorzy:
    Tryba, B.
    Brożek, P.
    Piszcz, M.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779749.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    kwas huminowy
    rozkład fotochemiczny
    TiO2
    FeC2O4
    humic acid (HA)
    photodecomposition
    photo-Fenton process
    Opis:
    Humic acid Leonardite IHSS standard was decomposed on TiO2 and TiO2 modifi ed by FeC2O4 via the photocatalysis and photo-Fenton processes under UV irradiation. Humic acid (HA) were favorable adsorbed on TiO2 surface and followed decomposition during UV irradiation faster on TiO2 than on the modifi ed samples. However, when H2O2 was added to the solution, the photo-Fenton process occurred on the prepared TiO2 samples, contained iron together with photocatalysis and high acceleration of HA decomposition was observed. In this case the mineralization degree was much higher than in the applied photocatalysis only, around 75% HA (with concentration of 18 mg/L) was mineralized after 3 h of adsorption and 5 h of UV irradiation in the presence of H2O2 and modifi ed TiO2 whereas on TiO2 mineralisation of HA occurred in around 45% only. The measured fl uorescence spectra of HA solutions showed that in the presence of H2O2 polycyclic aromatics were rapidly oxidized to the lower size products such as alcohols, aldehydes, ketones and carboxylic acids, what accelerated the process of HA decomposition.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 4; 8-14
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A preliminary study on antifungal effect of TiO2-based paints in natural indoor light
    Autorzy:
    Markowska-Szczupak, A.
    Ulfig, K.
    Grzmil, B.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778079.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    działanie przeciwgrzybicze
    dwutlenek tytanu
    naturalne światło w pomieszczeniach
    fotokatalizy
    antifungal activity
    titanium dioxide
    natural indoor light
    photocatalysis
    Opis:
    The antifungal activity of four commercial photocatalytic paints (KEIM Ecosil ME, Titanium FA, Photo Silicate and Silicate D) in natural indoor light was investigated. The paints contained TiO2 in rutile and anatase crystalline forms as evidenced by means of the X-ray diffraction analysis. In most cases the paints inhibited growth of fungi viz. Trichoderma viride, Aspergillus niger, Coonemeria crustacea, Eurotium herbariorum, and Dactylomyces sp . The KEIM Ecosil ME paint displayed the highest antifungal effect in the light, which could be explained with the highest anatase content. The paint antifungal activity and the fungal sensitivity to the TiO2- mediated photocatalytic reaction both decreased in the following orders: KEIM Ecosil ME > Titanium FA > Photo Silicate > Silicate D and T. viride > Dactylomyces sp. > A. niger > E. herbariorum.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 4; 53-57
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of titanium dioxide modification on the antibacterial properties
    Autorzy:
    Rokicka, P.
    Markowska-Szczupak, A.
    Kowalczyk, Ł.
    Kowalska, E.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778569.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    antibacterial properties
    Escherichia coli K12
    modified photocatalysts
    titanium dioxide
    visible-responsive photocatalysts
    Opis:
    Antibacterial properties of 15 titania photocatalysts, mono- and dual-modified with nitrogen and carbon were examined. Amorphous TiO2 , supplied by Azoty Group Chemical Factory Police S.A., was used as titania source (Ar-TiO2 , C-TiO2 , N-TiO2 ;2 and N,C-Ti2 2 calcined at 300°C, 400°C, 500°C, 600°C, 700°C). The disinfection ability was examined against Escherichia coli K12 under irradiation with UV and artificial sunlight and in dark conditions. It has been found the development of new photocatalysts with enhanced interaction ability with microorganisms might be a useful strategy to improve disinfection method conducted under artificial sunlight irradiation. The efficiency of disinfection process conducted under artificial sunlight irradiation with carbon (C-TiO2 ) and carbon/nitrogen (N,C-TiO2 ) photocatalysts was similar as obtained under UV irradiation. Furthermore, during dark incubation, any toxicity of the photocatalyst was noted.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 4; 56-64
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic mineralisation of humic acids using TiO2 modified by tungsten dioxide/ hydrogen peroxide
    Autorzy:
    Tryba, B.
    Piszcz, M.
    Borowiak-Paleń, E.
    Grzmil, B.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779747.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    kwasy humusowe
    WO3/TiO2
    powstawanie rodników
    humic acids photodecomposition
    OH radicals formation
    Opis:
    TiO2 of anatase structure was modified by tungsten dioxide and H2O2 in order to obtain WO3-TiO2 photocatalyst with enhanced photocatalytic activity under both, UV and artificial solar light irradiations. WO2 was dissolved in 30% H2O2 and mixed with TiO2 in a vacuum evaporator at 70°C. Such modified TiO2 was dried and then calcinated at 400 and 600°C.The prepared samples and unmodified TiO2 were used for the photocatalytic decomposition of humic acids (Leonardite standard IHSS) in the aqueous solution under irradiations of both, UV and artificial solar light. Modification of TiO2 with tungsten dioxide and H2O2 improved separation of free carriers in TiO2 which resulted in the increase of OH radicals formation. Calcination caused an increase of anatase crystals and higher yield in OH radicals. The uncalcined samples showed high abilities for the adsorption of HA. Combination of adsorption abilities and photocatalytic activity of photocatalyst caused that the uncalcined TiO2 modified with WO2/H2O2 showed the shortest time of HA mineralisation. The mineralisation of HA under the artificial solar light was much lower than under the UV. It was proved that, although OH radicals are powerful in the decomposition of HA, adsorption can facilitate the contact of the adsorbed molecules with the photocatalyst surface and accelerate their photocatalytic decomposition.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 2; 54-61
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NOx photocatalytic degradation on gypsum plates modified by TiO2-N,C photocatalysts
    Autorzy:
    Janus, M.
    Bubacz, K.
    Zatorska, J.
    Kusiak-Nejman, E.
    Czyżewski, A.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/779427.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    photocatalysis
    modified gypsum
    NOx
    Opis:
    In presented studies the photocatalytic decomposition of NOx on gypsum plates modified by TiO2-N,Cphotocatalysts were presented. The gypsum plates were obtained by addition of 10 or 20 wt.% of different types of titanium dioxide, such as: pure TiO2 and carbon and nitrogen co-modified TiO2 (TiO2-N,C) to gypsum. TiO2-N,C photocatalysts were obtained by heating up the starting TiO2 (Grupa Azoty Zakłady Chemiczne Police S.A) in the atmosphere of ammonia and carbon at the temperature: 100, 300 i 600ºC. Photocatalyst were characterized by FTIR/DRS, UVVis/DR, BET and XRD methods. Moreover the compressive strength tests of modified gypsum were also done. Photocatalytic activity of gypsum plates was done during NOx decomposition. The highest photocatalytic activity has gypsum with 20 wt.% addition of TiO2-N,C obtained at 300ºC.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 8-12
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary studies of photocatalytic activity of gypsum plasters containing TiO2 co-modified with nitrogen and carbon
    Autorzy:
    Janus, M.
    Bubacz, K.
    Zatorska, J.
    Kusiak-Nejman, E.
    Czyżewski, A.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778867.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    titanium dioxide
    gypsum
    TiO2/N
    self-cleaning
    Reactive Red 198
    Opis:
    The conducted studies were focused on the development of the gypsum material exhibiting self-cleaning properties. To this end, the raw gypsum was mixed with unique TiO2-based photocatalysts, previously modified by nitrogen and/ or carbon doping. The photocatalytic activity of the obtained gypsum plasters was evaluated trough the degradation of model organic compound (Reactive Red 198) under UV-vis irradiation. The impact of the photocatalysts presence on the physicochemical properties of the obtained gypsum plasters was evaluated. Furthermore, the role of non-metals presence on the photocatalytic properties of the TiO2 was determined. It was confirmed that the addition of N,C co-modified titanium dioxide into gypsum bestows this material with self-cleaning properties. The highest dye removal rate was displayed by the gypsum plaster containing optimal amount (10 wt%) of co-modified TiO2/N,C photocatalyst, after 20 hours of UV-vis irradiation.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 2; 96-102
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic properties of transparent TiO2 coatings doped with neodymium
    Autorzy:
    Wojcieszak, D.
    Kaczmarek, D.
    Domaradzki, J.
    Mazur, M.
    Morawski, A. W.
    Janus, M.
    Prociów, E.
    Gemmellaro, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779161.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    TiO2
    neodymium
    photocatalysis
    wettability
    surface properties
    Opis:
    In this work photocatalytic properties of TiO2 thin fi lms doped with 8.51 at. % of Nd were described. The self-cleaning phenomenon of thin fi lms was discussed together with the structural, optical and surface properties of prepared thin fi lms. Transparent coatings based on titanium dioxide were manufactured by high-energy reactive magnetron sputtering process. Incorporation of Nd during sputtering process results in amorphous behavior, without a signifi cant infl uence on transparency and colour as compared to the undoped TiO2-rutile matrix. Nevertheless, doping with neodymium doubles the photocatalytic activity of the matrix due to higher quantity of photo-generated charge carriers and more effi cient mechanism of energy transfer.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 3; 1-7
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic resonance study of co-modified (Co,N)-TiO2 nanocomposites
    Autorzy:
    Guskos, N.
    Zolnierkiewicz, G.
    Guskos, A.
    Typek, J.
    Berczynski, P.
    Dolat, D.
    Mozia, S.
    Aidinis, C.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/146542.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    nanocomposites
    titanium dioxide
    ferromagnetic resonance
    Opis:
    Three nCo,N-TiO2 nanocomposites (where cobalt concentration index n = 1, 5 and 10 wt %) were prepared and investigated by magnetic resonance spectroscopy at room temperature. Ferromagnetic resonance (FMR) lines of magnetic cobalt agglomerated nanoparticle were dominant in all registered spectra. The relaxation processes and magnetic anisotropy of the investigated spin system essentially depended on the concentration of cobalt ions. It is suggested that the samples contained two magnetic types of sublattices forming a strongly correlated spin system. It is suggested that the existence of strongly correlated magnetic system has an essential infl uence of the photocatalytic properties of the studied nanocomposites.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 411-416
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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