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Gold nanoparticle distribution in polyelectrolyte brushes loaded at different pH conditions

Boyaciyan, Dikran ; Braun, Larissa ; Löhmann, Oliver ; Silvi, Luca ; Schneck, Emanuel ; Klitzing, Regine von (2022):
Gold nanoparticle distribution in polyelectrolyte brushes loaded at different pH conditions. (Publisher's Version)
In: The Journal of Chemical Physics, 149 (16), AIP Publishing, ISSN 0021-9606, e-ISSN 1089-7690,
DOI: 10.26083/tuprints-00022937,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Gold nanoparticle distribution in polyelectrolyte brushes loaded at different pH conditions
Language: English
Abstract:

Composites made of polymer brushes with inclusions of gold nanoparticles (AuNPs) combine the responsive nature of polymer brushes with the optical properties of the AuNPs, which offers the possibility to be used as colorimetric sensors. To this end, it is crucial to know how AuNPs are distributed inside the brush. Here, this distribution was elucidated by neutron reflectometry with contrast variation and a self-consistent reflectivity analysis based on the analytical parameterization of the volume fraction profiles of all chemical components. In contrast to former studies, this analysis allows the determination of the spatial distribution of components separately from each other: polyelectrolyte, AuNP, and water. Cationic poly-[2-(Methacryloyloxy) ethyl] trimethylammonium chloride (PMETAC) brushes were loaded with 5 nm AuNPs, which were coated with a pH-sensitive capping. The pH was varied during the incubation of the brush in the AuNP suspension. At a lower pH, AuNPs form aggregates in suspension and are attached to the brush periphery. They adsorb into the brush but do not fully penetrate it due to their bulkiness. At a higher pH, AuNP suspensions are electrostatically stabilized and the AuNPs penetrate the brush entirely. However, the AuNP distribution over the brush is not homogeneous but decreases gradually toward the substrate. Penetration of the AuNPs leads to a more extended conformation of the brush. According to the results of the detailed analysis of all components, an increase in water content could be excluded as a reason for brush swelling but replacement of water by the AuNP was observed.

Journal or Publication Title: The Journal of Chemical Physics
Volume of the journal: 149
Issue Number: 16
Place of Publication: Darmstadt
Publisher: AIP Publishing
Collation: 9 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: Profile Areas > Thermo-Fluids & Interfaces
05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 28 Nov 2022 14:00
Last Modified: 28 Nov 2022 14:00
DOI: 10.26083/tuprints-00022937
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-229374
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22937
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