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    Wyświetlanie 1-4 z 4
    Tytuł:
    Hydrothermally Synthesized CuO Powders for Photocatalytic Inactivation of Bacteria
    Autorzy:
    Azimirad, R.
    Safa, S.
    Akhavan, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400560.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.50.Hp
    82.50.-m
    Opis:
    Various morphologies of monoclinic CuO powders were synthesized by hydrothermal treatment of copper nitrate, copper acetate or copper sulfate. The synthesized samples were characterized by scanning electron microscopy, X-ray diffractometry, the Fourier transform infrared spectroscopy, and diffuse reflectance spectrophotometry. Antibacterial activity of the samples was studied against Escherichia coli bacteria in dark and under visible light irradiation. Although the different precursors yielded the same band gap energies ( ≈1.6 eV) for the synthesized CuO samples, they resulted in various morphologies (hierarchy of stabilized micro/nanostructures), specific surface areas, concentrations of OH-surface groups, and visible light photocatalytic performances. The CuO nanorods synthesized from nitrate hydrothermal bath not only exhibited a considerable effective surface area, but also showed the highest concentration of absorbed OH-groups and subsequently, the strongest (photo)catalytic antibacterial properties ( ≈37 and 94% inactivation of the bacteria in dark and under visible light irradiation, respectively).
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1727-1731
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytical Decomposition of Contaminants οn Thin Film Gas Sensors
    Autorzy:
    Radecka, M.
    Łysoń, B.
    Lubecka, M.
    Czapla, A.
    Zakrzewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539145.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.-r
    73.90.+f
    82.50.Hp
    Opis:
    Gas sensing materials have been prepared in a form of $TiO_{2}-SnO_{2}$ thin films by rf reactive sputtering from $Ti:SnO_{2}$ and $Sn:TiO_{2}$ targets. Material studies have been performed by scanning electron microscopy, atomic force microscopy, X-ray diffraction at grazing incidence, Mössbauer spectroscopy, X-ray photoelectron spectroscopy and optical spectrophotometry. Dynamic gas sensing responses have been recorded as reproducible changes in the electrical resistance upon introduction of hydrogen at a partial pressure of 100-6000 ppm over a wide temperature range 473-873 K. Contamination experiments have been carried out with the motor oil (40 vol.% solution in $CCl_{4}$) in order to study the effect of UV light illumination on the gas sensor response. Optical spectroscopy has been applied to monitor the photodecomposition of the test compound, bromothymol blue. The Electronic Nose, ALPHA MOS FOX 4000 has been used in order to differentiate between different groups of motor oil vapors.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 415-419
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth Dynamics of Photoinduced Phase Domain in Cyano-Complex Studied by Boundary Sensitive Raman Spectroscopy
    Autorzy:
    Asahara, A.
    Nakajima, M.
    Fukaya, R.
    Tokoro, H.
    Ohkoshi, S.
    Suemoto, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490049.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.60.-i
    82.50.Hp
    78.30.-j
    Opis:
    Rubidium manganese hexacyanoferrate exhibits charge transfer phase transition from high temperature phase to low temperature phase at 230 K. This phase transition can also be triggered by light irradiation resonantly inducing charge transfer from $Mn^{2+}$ to $Fe^{3+}$. In the present study, boundary sensitive Raman spectroscopy was performed for $Rb_{0.94}Mn[Fe(CN)_6]_{0.98} \cdot 0.2H_2O$ in both cases of photoinduced and thermal phase transition. Since the frequencies of C ≡ N stretching vibration modes are very sensitive to the valence states of the adjacent metal ions, we can quantify the distribution of not only high and low temperature phase but also boundary configurations from the observed spectra. We obtained the time evolution of the fraction ratios of the valence states from the observed peak areas. In the case of photoinduced situation, the boundary increases up to 15% when high temperature phase diminishes to 55% of the initial fraction. This is quite different from the result in thermal phase transition where the boundary is created only 0.8% at the same high temperature phase fraction value. We conclude that many small domains are preferably created in photoinduced phase transition since the ratio of boundary is large, while large domains grow in thermal phase transition.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 375-384
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Au Nanoparticles Dimension on the Photocatalytic Performances of $TiO_2-Au$ Porous Composites
    Autorzy:
    Melinte, G.
    Baia, M.
    Georgescu, D.
    Baia, L.
    Iancu, V.
    Diamandescu, L.
    Popescu, T.
    Cotet, L.
    Barbu-Tudoran, L.
    Danciu, V.
    Simon, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491327.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Rm
    81.07.Wx
    82.80.Ej
    68.37.Lp
    82.65.+r
    82.50.Hp
    Opis:
    The influence of Au nanoparticles dimension on the photocatalytic performances of the $TiO_2$ aerogels-Au composites was evaluated. Structural and morphological peculiarities of the $TiO_2$ aerogel, unloaded and loaded with 5 and 22 nm Au nanoparticles, were studied by transmission electron microscopy technique, X-ray diffraction and $N_2$-sorption measurements. UV-Vis diffuse reflectance measurements were performed to determine the band gap energies. The photocatalytic activity was evaluated by monitoring the salicylic acid photodegradation. It was found that the Au nanoparticles promote the anatase phase crystallization and produce the decrease of the specific surface area and band gap energy values. The porous composite with the smallest Au nanoparticles dimension exhibits the best photocatalytic performances.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 208-210
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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