Web Release Date: March 6,
Reversible Loading and Unloading of Nanoparticles in "Exponentially" Growing Polyelectrolyte LBL Films
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Departments of Chemical Engineering, Materials Science and Engineering, Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109 and Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche 595, Université Louis Pasteur-Faculté de Chirurgie Dentaire, 11 rue Humann, 67085 Strasbourg Cédex, France
Received December 26, 2007
Abstract:
The exponentially growing layer-by-layer (LBL) films made from poly(diallyldimethylammonium chloride) (PDDA) and poly(acrylic acid) (PAA) were used to load and unload the CdTe nanoparticles (NPs). The reversible loading of NPs were investigated through UV-vis studies and further confirmed by confocal microscopy. In addition the LBL films were also compared for the release kinetics for pH 9 and 7 and films capped with (PDDA-PSS)10 layers. The amount of released particles at pH 9 was found to be at least 2 orders of magnitude higher than those at pH 7 and with (PDDA-PSS)10 capped layers after 25 h. This variation in film response for CdTe-particle release presents a route for studies in which highly swollen exponentially growing LBL films can be loaded with functionalized NPs for biological applications and explored as carriers to hold the NPs inside the films for self-assembly.
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