Bauer, Alina; Hauschild, Stephan; Stolzenburg, Michael; Foerster, Stephan; Mayer, Christian:
Molecular exchange through membranes of poly(2-vinylpyridine-block-ethylene oxide) vesicles.
2006
In: Chemical Physics Letters, Jg. 419 (2006), Heft 4-6, S. 430 - 433
Artikel/Aufsatz in Zeitschrift / Fach: Chemie
Titel:
Molecular exchange through membranes of poly(2-vinylpyridine-block-ethylene oxide) vesicles.
Autor(in):
Bauer, Alina im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Hauschild, Stephan; Stolzenburg, Michael; Foerster, Stephan; Mayer, Christian im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr
2006
Erschienen in:
Chemical Physics Letters, Jg. 419 (2006), Heft 4-6, S. 430 - 433
ISSN

Abstract:

The permeability of ethylene oxide-2-vinylpyridine diblock copolymer vesicles was studied using pulsed field gradient NMR spectroscopy. Polyethylene oxide mols. of various mol. masses were used as tracers for the observation of the trans-membrane exchange process under equil. and non-equil. conditions. For small polyethylene oxide chains (M w < 3400 g/mol), the anal. yielded a strong and roughly linear dependence of the logarithmic trans-membrane exchange rate on the hydrodynamic radius of the sample mols. With mol. masses increasing above M w = 3400 g/mol, the dependence of the exchange rate vs. the hydrodynamic radius decreased drastically, indicating two independent mechanisms of permeation.