Publication: Aggregation of gold nanoparticles in presence of the thermoresponsive cationic ciblock copolymer PNIPAAM48-b-PAMPTMA6
Authors
Herrera Robalino, David ; Durán del Amor, María del Mar ; Almagro Gómez, Carmen María ; Hernández Cifre, José G.
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Publisher
MDPI
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DOI
https://doi.org/10.3390/polym13234066
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info:eu-repo/semantics/article
Description
© 2021 by the authors. This manuscript version is made available under the CC-BY 4.0 license http://creativecommons.org/licenses/by/4.0/
This document is the Published Manuscript version of a Published Work that appeared in final form in Polymers. To access the final edited and published work see https://doi.org/10.3390/polym13234066
Abstract
The adsorption of the thermoresponsive positively charged copolymer poly(N-isopropylacr
ylamide)-block-poly(3-acrylamidopropyl)trimethylammonium chloride, PNIPAAM48-b-PAMPTMA6(+),
onto negatively charged gold nanoparticles can provide stability to the nanoparticles and make
the emerging structure tunable by temperature. In this work, we characterize the nanocomposite
formed by gold nanoparticles and copolymer chains and study the influence of the copolymer on
the expected aggregation process that undergoes those nanoparticles at high ionic strength. We
also determine the lower critical solution temperature (LCST) of the copolymer (around 42 ºC)
and evaluate the influence of the temperature on the nanocomposite. For those purposes, we use
dynamic light scattering, UV-vis spectroscopy and transmission electron microscopy. At the working
PNIPAAM48-b-PAMPTMA6(+) concentration, we observe the existence of copolymer structures that
trap the gold nanoparticles and avoid the formation of nanoparticles aggregates. Finally, we discuss
how these structures can be useful in catalysis and nanoparticles recovery.
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Citation
Polymers, 2021, Vol. 13 (23) : 4066
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