0025803 - ÚFCH JH 2006 RIV US eng J - Článek v odborném periodiku
Humpolíčková, J. - Štěpánek, M. - Procházka, K. - Hof, Martin
Solvent relaxation study of pH-dependent hydration of poly(oxyethylene) shells in polystyrene-block-poly(2-vinylpyridine)-block-poly(oxyethylene) micelles in aqueous solutions.
[Aplikace metody relaxace rozpouštědla pro studium pH závislé hydratace polyoxyethylenových slupek ve vodném roztoku polystyrene-block-poly(2-vinylpyridine)-block-poly(oxyethylen)ových micel.]
Journal of Physical Chemistry A. Roč. 109, č. 48 (2005), s. 10803-10812. ISSN 1089-5639. E-ISSN 1520-5215
Grant CEP: GA ČR GP203/02/D048; GA ČR GA203/04/0490; GA AV ČR IAA400400503
Grant ostatní: Marie Curie Research(XE) 505 027
Výzkumný záměr: CEZ:AV0Z40400503
Klíčová slova: onion-type micelles * mixed polyelectrolyte/nonelectrolyte shells * time-resolved fluorescence
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 2.898, rok: 2005

The hydration of the poly(oxyethylene) shell in polystyrene-block-poly(2-vinylpyridine)-block-poly(oxyethylene) micelles was investigated by monitoring the solvent relaxation response of a solvent-sensitive fluorophore (patman). It has been found that the relaxation occurs on the nanosecond time scale. Results for triblock copolymer micelles have been compared with those obtained for polystyrene-block-poly(2-vinylpyridine) micelles in order to evaluate the effect of the outer polyoxyethylene layer. Considerable pH-dependent changes in the hydration of poly(oxyethylene) units at the poly(2-vinylpyridine)/polyoxyethylene interface were observed. Additionally, the paper shows that the solvent relaxation technique is a suitable tool for studying polymeric nanoparticles and that the measurement of time-dependent half-width of the emission spectrum allows for estimation of the extent of relaxation process observed by a given experimental setup.

V této práci byly studovány aplikace metody relaxace rozpouštědla pro studium pH závislé hydratace polyoxyethylenových slupek ve vodném roztoku polystyrene-block-poly(2-vinylpyridine)-block-poly(oxyethylen)ových micel
Trvalý link: http://hdl.handle.net/11104/0003210