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Proceedings Paper

Solvent relaxation studies applied to stimuli-responsive core-shell nanoparticles
Author(s): Karel Procházka; Pavel Matějíček; Miroslav Štěpánek; Zuzana Limpouchová; Martin Hof; Jana Humpolíčková; Radek Šachl; Jörg Schröder
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Paper Abstract

Solvent relaxation method (SRM) was used for studying the solvation and behavior of shells of polymeric micelles formed by linear polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) block copolymer (PS-PVP-PEO) in acidic aqueous media. The shell is formed by partially ionized (protonated) PVP and PEO blocks, while the compact spherical core is formed by PS. An amphiphilic fluorescent surfactant, PATMAN was used as a probe. It was shown by independent study that it binds strongly to micelles and that its fluorescent part monitors a thin PEO layer close to the PVP-PEO interface. The behavior of PATMAN in non-viscous low-molar-mass solvents was studied first and then the study of PS-PEO, PS-PVP and PS-PVP-PEO micelles was performed. The comparison of SRM data for all studied systems allows for a plausible explanation of a slightly surprising behavior of PS-PVP-PEO micelles in acidic aqueous buffers where an unexpected aggregation of micelles is observed at low pH.

Paper Details

Date Published: 25 February 2010
PDF: 12 pages
Proc. SPIE 7571, Single Molecule Spectroscopy and Imaging III, 757104 (25 February 2010); doi: 10.1117/12.842172
Show Author Affiliations
Karel Procházka, Charles Univ. in Prague (Czech Republic)
Pavel Matějíček, Charles Univ. in Prague (Czech Republic)
Miroslav Štěpánek, Charles Univ. in Prague (Czech Republic)
Zuzana Limpouchová, Charles Univ. in Prague (Czech Republic)
Martin Hof, Czech Academy of Sciences (Czech Republic)
Jana Humpolíčková, Czech Academy of Sciences (Czech Republic)
Radek Šachl, Czech Academy of Sciences (Czech Republic)
Jörg Schröder, Univ. of Göttingen (Germany)

Published in SPIE Proceedings Vol. 7571:
Single Molecule Spectroscopy and Imaging III
Jörg Enderlein; Zygmunt Karol Gryczynski; Rainer Erdmann, Editor(s)

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