Additional data: Impact of Chitosan's Degree of Deacetylation, Molecular Weight, and Crystallinity on the Photoresponsive Properties of Azobenzene-modified Films and Membranes.
Type of the data | Dataset | |
Type of the data | Image | |
Type of the data | Text | |
Type of the data | Other | |
Total size of the dataset | 128016387 | |
Author | von Seggern, Nils | |
Author | M. Thiebes, Yannick | |
Author | Niewa, Rainer | |
Author | Cord-Landwehr, Stefan | |
Author | Moerschbacher, Bruno | |
Author | Tovar, Günter E.M. | |
Upload date | 2024-11-15T20:14:48Z | |
Publication date | 2024-11-15T20:14:48Z | |
Publication date | 2024-11-15 | |
Abstract of the dataset | A profound understanding of how the degree of deacetylation (DDA), polymerization degree (DP) and photoswitch concentration impact the photomodulation of properties of chitosan(CS)-based responsive materials can serve as a framework for future applications. Herein, we report responsive thin-films manufactured from chitosans with DDA ranging from 70-94% and DP between 170-3380, incorporating 10 30mol% of the light-responsive azobenzene derivative Sodium-4-[(4-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)phenyl)diazenyl]-benzenesulfonate (TEGABS). During UV-irradiation of the 10 30% TEGABS|CS thin-films, e.g. a significant increase of the indentation modulus by 10 ± 5% is observed. UV illumination leads to a decrease of the water vapor permeability (WVP), reducing it by up to 81 ± 17% compared to native state. We demonstrate that TEGABS up to 10% remains as a solid-solution in CS films with differing amount of H-aggregates depending on the DDA and DP. TEGABS in concentrations >10% in CS leads to phase separation of TEGABS crystallites with a diameter of 21 ± 8 nm. To conclude the photothermal heating by UV irradiation and the resulting water evaporation are identified as the primary driving force for the variation in mechanical properties and WVP, with photoisomerization playing a subordinate factor. These findings provide a new pathway for the design of polysaccharide-based water vapor permeable photoresponsive membranes. | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/1070 | |
Public reference to this page | https://doi.org/10.25532/OPARA-667 | |
Publisher | Technische Universität Bergakademie Freiberg | |
Licence | Attribution 4.0 International | en |
URI of the licence text | http://creativecommons.org/licenses/by/4.0/ | |
Specification of the discipline(s) | 4::43::406::406-01 | |
Specification of the discipline(s) | 3::31::322::322-01 | |
Title of the dataset | Additional data: Impact of Chitosan's Degree of Deacetylation, Molecular Weight, and Crystallinity on the Photoresponsive Properties of Azobenzene-modified Films and Membranes. | |
Public project website(s) | www.stegbauerlab.de | |
Project title | Biogenic Engineering Materials |
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