Autor: Szpakowska, M - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the mechanism of oscillations in three-phase system containing cationic surfactant and nitrobenzene liquid membrane
Autorzy:: Szpakowska, M.
Powiązania:: https://bibliotekanauki.pl/articles/347070.pdf
Data publikacji:: 2004
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: liquid membrane
membrane oscillator
cationic surfactant
electrochemical potential difference
oscillation mechanism
Opis:: Oscillations of electrochemical potential difference between donor and acceptor aqueous phases of nitrobenzene oscillator containing hexadecyltrimethylammonium bromide were observed. It was shown that this potential difference is composed of two–phase boundary potentials between a membrane and an appropriate aqueous phase. It appears that oscillations occur at an aqueous acceptor/membrane interface. They are caused by adsorption/desorption processes of surfactant ions pairs with bromide or picrate followed by their transfer to the acceptor phase. The processes taking part in three stages of oscillation mechanism were suggested.
Źródło:: Ars Separatoria Acta; 2004, 3; 98-104
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Spectrophotometric investigations of nitrobenzene liquidmembrane oscillator with hexadecyltrimethylammonium bromide
Autorzy:: Szpakowska, M.
Czaplicka, I.
Powiązania:: https://bibliotekanauki.pl/articles/347013.pdf
Data publikacji:: 2003
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: oscillations
liquid membrane oscillator
liquid membrane
cationic surfactant
nitrobenzene absorption spectra
picric acid spectra
Opis:: The oscillations of electrochemical potential difference between aqueous phases of a liquid membrane oscillator containing cationic surfactant are presented. By UV-VIS spectroscopy, the concentrations of liquid membrane components (nitrobenzene and picric acid) in the both aqueous phases were established during the oscillation process. It was shown that nitrobenzene molecules are transferred to the aqueous phases from the beginning of that dynamic process. Picric acid molecules are not observed in the donor phase, meanwhile, from the beginning of the process they are transported to the acceptor phase. It can be concluded that the transport of the liquid membrane components to the aqueous phases is not responsible for the observed oscillations of electrochemical potential difference.
Źródło:: Ars Separatoria Acta; 2003, 2; 64-70
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Investigation of nitrobenzene liquid membrane oscillator containing benzyldimethyltetradecylammonium chloride
Autorzy:: Szpakowska, M.
Płocharska-Jankowska, E.
Powiązania:: https://bibliotekanauki.pl/articles/346925.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: liquid membrane
membrane oscillator
cationic surfactant
electric potential difference
taste substances
Opis:: The oscillatory behaviour of a nitrobenzene liquid membrane oscillator containing benzyldimethyltetradecylammonium chloride was investigated in order to recognize the oscillation mechanism. The influence of temperature and electrode distances from the interfaces as well as the donor, membrane and acceptor phase composition on the changes of electric potential difference between aqueous phases was examined. The effect of the surfactant structure on the oscillation characteristics was discussed. It was shown that the appearance of oscillations requires the simultaneous presence of surfactant, picric acid and ethanol in the system. The mechanism of oscillations in this system should be similar as the one in an oscillator containing hexadecyltrimethylammonium bromide where oscillations of electric potential difference between the two aqueous phases are produced by sudden adsorption and desorption of the surfactant and the ionic pair: a surfactant-picric anion at the a/m interface. The diffusion fluxes of all these species in the vicinity of a/m interface also play an important role. They might couple, which leads to the nonlinear behaviour of the system. The oscillation curves obtained for the liquid membrane oscillator with benzyldimethyltetradecylammonium chloride and different taste substances were analyzed by the construction of the corresponding attractors in two-dimensional space using the time delay method. Each system has its own attractor differing in shape and surface. Therefore, these properties might be used for identifying an unknown taste substance present in the acceptor phase.
Źródło:: Ars Separatoria Acta; 2007, 5; 7-18
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

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