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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Vapaavuori, Jaana
Aalto University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2024Block Copolymer Approach toward Selective Atomic-Layer Deposition of ZnO Films
- 2024A Stable Perovskite Sensitized Photonic Crystal P−N Junction with Enhanced Photoelectrochemical Hydrogen Production
- 2024A Stable Perovskite Sensitized Photonic Crystal P−N Junction with Enhanced Photoelectrochemical Hydrogen Production
- 2024Hydrophobized lignin nanoparticle-stabilized Pickering foams : building blocks for sustainable lightweight porous materialscitations
- 2023Block Copolymer Approach toward Selective Atomic-Layer Deposition of ZnO Films
- 2023Potato virus A particles – A versatile material for self-assembled nanopatterned surfacescitations
- 2023Recent developments of electrodeposition-redox replacement in metal recovery and functional materials: A reviewcitations
- 2023Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textilescitations
- 2023Acoustic Properties of Aerogels: Current Status and Prospectscitations
- 2022Probing interfacial interactions and dynamics of polymers enclosed in boron nitride nanotubes
- 2022Plant-Based Structures as an Opportunity to Engineer Optical Functions in Next-Generation Light Managementcitations
- 2022Plant-Based Structures as an Opportunity to Engineer Optical Functions in Next-Generation Light Managementcitations
- 2022Acoustic Properties of Aerogels: Current Status and Prospectscitations
- 2019Nanocellulose and Nanochitin Cryogels Improve the Efficiency of Dye Solar Cellscitations
- 2019Nanocellulose and Nanochitin Cryogels Improve the Efficiency of Dye Solar Cellscitations
- 2019Patterned Cellulose Nanocrystal Aerogel Films with Tunable Dimensions and Morphologies as Ultra-Porous Scaffolds for Cell Culturecitations
- 2015From partial to complete optical erasure of azobenzene-polymer gratings effect of molecular weightcitations
- 2015Submolecular Plasticization Induced by Photons in Azobenzene Materialscitations
- 2013Photoinduced surface patterning of azobenzene-containing supramolecular dendrons, dendrimers and dendronized polymerscitations
Places of action
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article
Submolecular Plasticization Induced by Photons in Azobenzene Materials
Abstract
We demonstrate experimentally for the first time that the illumination of azobenzene derivatives leads to changes in molecular environment similar to those observed on heating but that are highly heterogeneous at the submolecular scale. This localized photoplasticization, which can be associated with a free volume gradient, helps to understand the puzzling phenomenon of photoinduced macroscopic material flow and photoexpansion upon illumination far below the glass transition temperature (Tg). The findings stem from the correlation of infrared (IR) spectral band shifts measured upon illumination with those measured at controlled temperatures for two amorphous DR1-functionalized azo derivatives, a polymer, pDR1A, and a molecular glass, gDR1. This new approach reveals that IR spectroscopy can be used as an efficient label-free molecular-scale thermometer that allows the assignment of an effective temperature (Teff) to each moiety in these compounds when irradiated. While no band shift is observed upon illumi...