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Article

Photoresponsive Photoacid-Macroion Nano-Assemblies

Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany
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Polymers 2020, 12(8), 1746; https://doi.org/10.3390/polym12081746
Received: 21 June 2020 / Revised: 27 July 2020 / Accepted: 31 July 2020 / Published: 5 August 2020
(This article belongs to the Special Issue Photoresponsive Polymeric Materials)
In this study, light-responsive nano-assemblies with light-switchable size based on photoacids are presented. Anionic disulfonated napthol derivates and cationic dendrimer macroions are used as building blocks for electrostatic self-assembly. Nanoparticles are already formed under the exclusion of light as a result of electrostatic interactions. Upon photoexcitation, an excited-state dissociation of the photoacidic hydroxyl group takes place, which leads to a more highly charged linker molecule and, subsequently, to a change in size and structure of the nano-assemblies. The effects of the charge ratio and the concentration on the stability have been examined with absorption spectroscopy and ζ-potential measurements. The influence of the chemical structure of three isomeric photoacids on the size and shape of the nanoscale aggregates has been studied by dynamic light scattering and atomic force microscopy, revealing a direct correlation of the strength of the photoacid with the changes of the assemblies upon irradiation. View Full-Text
Keywords: electrostatic self-assembly; irradiation; nano-assemblies; nanostructures; polyelectrolyte; photoacid; photoresponsive; supramolecular; switchability electrostatic self-assembly; irradiation; nano-assemblies; nanostructures; polyelectrolyte; photoacid; photoresponsive; supramolecular; switchability
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MDPI and ACS Style

Zika, A.; Bernhardt, S.; Gröhn, F. Photoresponsive Photoacid-Macroion Nano-Assemblies. Polymers 2020, 12, 1746. https://doi.org/10.3390/polym12081746

AMA Style

Zika A, Bernhardt S, Gröhn F. Photoresponsive Photoacid-Macroion Nano-Assemblies. Polymers. 2020; 12(8):1746. https://doi.org/10.3390/polym12081746

Chicago/Turabian Style

Zika, Alexander, Sarah Bernhardt, and Franziska Gröhn. 2020. "Photoresponsive Photoacid-Macroion Nano-Assemblies" Polymers 12, no. 8: 1746. https://doi.org/10.3390/polym12081746

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