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Stimuli‐Responsive Multilayered Hybrid Nanoparticle/Polyelectrolyte Capsules
Author(s) -
De Geest Bruno G.,
Skirtach Andrei G.,
De Beer Thomas R. M.,
Sukhorukov Gleb B.,
Bracke Lieven,
Baeyens Willy R. G.,
Demeester Joseph,
De Smedt Stefaan C.
Publication year - 2007
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600631
Subject(s) - polyelectrolyte , nanoparticle , chemical engineering , dissolution , materials science , coating , covalent bond , surface charge , raman spectroscopy , surface modification , nanotechnology , polymer chemistry , chemistry , polymer , organic chemistry , composite material , physics , optics , engineering
Gold nanoparticles (Au NP ) with carboxyl groups on their surface were used in combination with PAH for the layer‐by‐layer coating of CaCO 3 microparticles, followed by the dissolution of the CaCO 3 core. SEM, TEM, and confocal microscopy are used to characterize the hybrid nanoparticles/polyelectrolyte capsules. As the Au NP have carboxyl groups on their surface, their charge density is pH dependent; therefore, the capsules exhibit a pH‐dependent swelling and can be deconstructed both at low and high pH. By covalent cross‐linking of the carboxyl groups of the Au NP and the amino groups of the PAH, it is possible to suppress the pH‐responsive behavior. Au NP are used as activation centers using IR light and this ability is used to release encapsulated material from the nanoparticles/polyelectrolyte capsules as well as for the enhancement of detection and imaging of such capsules by Raman microspectrosopy.
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