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Article

Embedding Photoacids into Polymer Opal Structures: Synergistic Effects on Optical and Stimuli-Responsive Features

1
Polymer Chemistry, Saarland University, Campus Saarbrücken C4 2, 66123 Saarbrücken, Germany
2
Biophysical Chemistry, Saarland University, Campus B2 2, 66123 Saarbrücken, Germany
3
Saarene-Saarland Center for Energy Materials and Sustainability, Campus C4 2, 66123 Saarbrücken, Germany
*
Authors to whom correspondence should be addressed.
Academic Editor: Chris E. Finlayson
Molecules 2021, 26(23), 7350; https://doi.org/10.3390/molecules26237350
Received: 30 October 2021 / Revised: 26 November 2021 / Accepted: 30 November 2021 / Published: 3 December 2021
(This article belongs to the Special Issue Polymeric Photonic Materials)
Opal films with their vivid structural colors represent a field of tremendous interest and obtained materials offer the possibility for many applications, such as optical sensors or anti-counterfeiting materials. A convenient method for the generation of opal structures relies on the tailored design of core-interlayer-shell (CIS) particles. Within the present study, elastomeric opal films were combined with stimuli-responsive photoacids to further influence the optical properties of structurally colored materials. Starting from cross-linked polystyrene (PS) core particles featuring a hydroxy-rich and polar soft shell, opal films were prepared by application of the melt-shear organization technique. The photoacid tris(2,2,2-trifluoroethyl) 8-hydroxypyrene-1,3,6-trisulfonate (TFEHTS) could be conveniently incorporated during freeze-drying the particle dispersion and prior to the melt-shear organization. Furthermore, the polar opal matrix featuring hydroxylic moieties enabled excited-state proton transfer (ESPT), which is proved by spectroscopic evaluation. Finally, the influence of the photoacid on the optical properties of the 3-dimensional colloidal crystals were investigated within different experimental conditions. The angle dependence of the emission spectra unambiguously shows the selective suppression of the photoacid’s fluorescence in its deprotonated state. View Full-Text
Keywords: opal film; melt-shear organization; photoacid; excited-state proton transfer; fluorescence; polymer particle synthesis opal film; melt-shear organization; photoacid; excited-state proton transfer; fluorescence; polymer particle synthesis
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MDPI and ACS Style

Bitsch, M.; Boehm, A.K.; Grandjean, A.; Jung, G.; Gallei, M. Embedding Photoacids into Polymer Opal Structures: Synergistic Effects on Optical and Stimuli-Responsive Features. Molecules 2021, 26, 7350. https://doi.org/10.3390/molecules26237350

AMA Style

Bitsch M, Boehm AK, Grandjean A, Jung G, Gallei M. Embedding Photoacids into Polymer Opal Structures: Synergistic Effects on Optical and Stimuli-Responsive Features. Molecules. 2021; 26(23):7350. https://doi.org/10.3390/molecules26237350

Chicago/Turabian Style

Bitsch, Martin, Anna Katharina Boehm, Alexander Grandjean, Gregor Jung, and Markus Gallei. 2021. "Embedding Photoacids into Polymer Opal Structures: Synergistic Effects on Optical and Stimuli-Responsive Features" Molecules 26, no. 23: 7350. https://doi.org/10.3390/molecules26237350

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