Pabst, F, Kraus, J, Reynolds, M et al. (2 more authors) (2023) Preserving fast ion dynamics while introducing mechanical rigidity in gelatin-based ionogels. Soft Matter, 19 (7). pp. 1418-1428. ISSN 1744-683X
Abstract
Ionogels are gels containing ions, often an ionic liquid (IL), and a gelling agent. They are promising candidates for applications including batteries, photovoltaics or fuel cells due to their chemical stability and high ionic conductivity. In this work we report on a thermo-irreversible ionic gel prepared from a mixture of the ionic liquid 1-butyl-3-methylimidazolium ([BMIM]) dicyanamide ([DCA]), water and gelatin, which combines the advantages of an ionic liquid with the low cost of gelatin. We use (i) dielectric spectroscopy to monitor the ion transport, (ii) dynamic light scattering techniques to access the reorientational motions of the ions, as well as fluctuations of the gel matrix, and (iii) rheology to determine the shear response from above room temperature down to the glass transition. In this way, we are able to connect the microscopic ion dynamics with the meso- and macroscopic behavior of the gelatin matrix. We show, by comparing our results to those for a IL–water mixture from a previous study, that although some weak additional slow relaxation modes are present in the gel, the overall ion dynamics is hardly changed by the presence of gelatin. The macroscopic mechanical response, as probed by rheology, is however dominated by the gel matrix. This behaviour can be highly useful e.g. in battery gel electrolytes which prevent electrolyte leakage and combine mechanical rigidity and flexibility.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This journal is © The Royal Society of Chemistry 2023. This is an open access article under the terms of the Creative Commons Attribution 3.0 Unported Licence (CC BY 3.0). |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Soft Matter Physics (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/M009521/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Feb 2023 15:23 |
Last Modified: | 25 Jun 2023 23:15 |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Identification Number: | 10.1039/d2sm01143c |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:195999 |