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    Wyświetlanie 1-4 z 4
    Tytuł:
    Determination and Comparison of Ideal and Practical Selectivity Coefficients of Membranes Containing Different Conductive Polymers
    Autorzy:
    Stolarczyk, A.
    Turczyn, R.
    Januszkiewicz-Kaleniak, A.
    Domagała, W.
    Imach, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399402.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.39.Wj
    47.57.Ng
    Opis:
    In series of published works, usually, the ideal coefficients of selectivity is used as an indicator for separation performance of conducting polymer membranes. The main goal of the presented paper was to determine the relation between the ideal and practical selectivity coefficients of the investigated series of conductive polymer membranes, both layered and composite one, and assessed whether it is possible to rely only on the values of ideal selectivity coefficient for estimation of the membrane separation capacity. The results showed that high values of ideal membrane selectivity coefficients are necessary but not a sufficient indicator for evaluation of the real selectivity of membranes made from conducting polymers.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 563-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon Black Loaded Composite Poly(Dimethyl Siloxane) Membrane Preparation and Application for Hazardous Chemical Removal from Water
    Autorzy:
    Nigiz, F.
    Unlu, D.
    Hilmioglu, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031928.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.39.Wj
    82.45.Mp
    81.05.Qk
    81.05.Lg
    Opis:
    Industrial waste-water contains hundreds of hazardous chemical components such as volatile organic compounds. Several of the chemicals, such as acetone, are soluble in water. These chemicals pose a threat to the human health and ecosystem. The governments are interested in decreasing the concentration of these chemicals in waste-water by making environmental regulations. Most of the chemical industries have their own waste-water treatment units. These units can separate impurities down to ppm level. After that point, more complicated and costly methods are required. Alternatively, membrane separation methods, such as pervaporation can be used for selective separations of the volatile organic compounds. Pervaporative separation system is defined as environmentally friendly, cost effective process to separate azeotropic and water soluble mixtures. The membrane is the main constituent of the pervaporation and the performance of the separation is directly affected by the membrane selection. In this study, carbon black loaded poly(dimethyl siloxane) mixed matrix membrane was prepared to separate acetone from water by pervaporation. Thermal gravimetric analysis was applied to determine the thermal behavior of the membrane. Inorganic distribution was monitored by means of polarized electron microscopy. Contact angle measurement was applied to determine the effect of filler incorporation on the polymer hydrophobicity. Effect of temperature and feed molar ratio on acetone selectivity and flux were determined.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 693-696
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biodiesel from Oleic Acid by Green Catalyst "Catalytic Membrane": a Solution to Global Warming Problems
    Autorzy:
    Unlu, D.
    Nigiz, F.
    Hilmioglu, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031572.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.39.Wj
    88.20.F-
    88.20.fk
    92.70.Mn
    Opis:
    In recent years biodiesel is receiving more attention as a sustainable alternative to fossil fuel. Biodiesel has lower exhaust emissions and toxicity compared to petroleum diesel fuel. In this study, biodiesel is produced from the oleic acid esterification process. We try to develop an efficient heterogeneous catalyst for biodiesel synthesis. A catalytic membrane carboxymethyl cellulose with sulfosuccinic acid has been prepared for using as catalyst. Carboxymethyl cellulose is a natural and biodegradable polymer and it has the advantage of green catalysis. Sulfosuccinic acid is a homogeneous catalyst. To overcome the disadvantages of the homogenous catalyst, sulfosuccinic acid is used together with polymeric membranes. The effects of the ethanol/oleic acid molar ratio, the reaction temperature, the sulfosuccinic acid concentration and the stirring speed were investigated to find out the optimum reaction conditions. The catalytic stability of the catalytic membrane is also studied. The optimum conditions for the reaction were found to be 65°C, catalytic membrane with 6 mmol of sulfosuccinic acid, 9:1 ethanol to oleic acid molar ratio and 600 rpm stirring speed. The oleic acid conversion using the catalytic membrane was 85% under these conditions after 6 h. Our findings show that carboxymethyl cellulose membrane with sulfosuccinic acid groups is a suitable catalyst for esterification.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 689-692
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Mössbauer Spectroscopy in Study of Selected Biochemical Processes
    Autorzy:
    Burda, K.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035750.pdf
    Data publikacji:
    2003-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Ej
    82.39.Jn
    82.35.Np
    82.39.Wj
    82.39.Rt
    Opis:
    The $\text{}^{57}$Fe, $\text{}^{119}$Sn, $\text{}^{129}$I, and $\text{}^{151}$Eu Mössbauer spectroscopy, scanning force microscopy, and optical fluorescence method were applied to study biological systems starting from porphyrins, through cytochromes and cell membranes until such a complex system as photosystem II. In Fe-porphyrin aggregates iron atoms are able to trap an electron exhibiting the mixed valence Fe$\text{}^{3+}$-Fe$\text{}^{2+}$ relaxation process. In ironcytochrome c the presence of two different Fe$\text{}^{3+}$ states are indicated, while in tincytochrome Sn appears in Sn$\text{}^{4+}$ and Sn$\text{}^{2+}$ states. From the temperature dependence of the mean square displacement of the resonance nuclei and from the diffusional broadening of the Mössbauer line it was possible to separate the vibrational, fast collective and slow collective motions in tinporphyrin and in iron- and tin-cytochrome c. The electronic state of iodine in oleic acid, the main constituent of cellular membranes, was determined. The molecular mechanism of triphenyltin interaction with membrane of red blood cells has been suggested and the model of haemolysis has been proposed. In photosystem II, Eu ions replacing calcium showed Eu$\text{}^{3+}$ to Eu$\text{}^{2+}$ transition after illumination with light, which points out the possible role of Ca$\text{}^{2+}$ ions in electron transfer in the process of photosynthetic water splitting process.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 5; 499-509
    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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