Glyoxal crosslinking of electro-responsive alginate-based hydrogels: Effects on the properties.
To improve the features of alginate-based hydrogels in physiological conditions, Ca(2+)-crosslinked semi-interpenetrated hydrogels formed by poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid and alginate (PEDOT/Alg) were subjected to a treatment with glyoxal to form a dual ionic/covalent ne...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Fundació Sant Joan de Déu |
| Repositorio: | r-FSJD. Repositorio Institucional de Producción Científica de la Fundació Sant Joan de Déu |
| OAI Identifier: | oai:fsjd.fundanetsuite.com:p26245 |
| Acceso en línea: | https://fsjd.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=26245 |
| Access Level: | acceso abierto |
| Palabra clave: | Conducting hydrogels Dual network Electrochemical biosensor Poly(3,4-ethylenedioxythiophene) Semi-interpenetrated hydrogel |
| Sumario: | To improve the features of alginate-based hydrogels in physiological conditions, Ca(2+)-crosslinked semi-interpenetrated hydrogels formed by poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid and alginate (PEDOT/Alg) were subjected to a treatment with glyoxal to form a dual ionic/covalent network. The covalent network density was systematically varied by considering different glyoxalization times (t(G)). The content of Ca(2+) was significantly higher for the untreated hydrogel than for the glyoxalized ones, while the properties of the hydrogels were found to largely depend on t(G). The porosity and swelling capacity decreased with increasing t(G), while the stiffness and electrical conductance retention capacity increased with t(G). The potentiodynamic response of the hydrogels notably depended on the amount of conformational restraints introduced by the glyoxal, which is a very short crosslinker. Thus, the re-accommodation of the polymer chains during the cyclic potential scans became more difficult with increasing number of covalent crosslinks. This information was used to improve the performance of untreated PEDOT/Alg as electrochemical sensor of hydrogen peroxide by simply applying a t(G) of 5 min. Overall, the control of the properties of glyoxalized hydrogels through t(G) is very advantageous and can be used as an on-demand strategy to improve the performance of such materials depending on the application. |
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