دورية أكاديمية
Direct Measurements of Electroviscous Phenomena in Nafion Membranes
| العنوان: | Direct Measurements of Electroviscous Phenomena in Nafion Membranes |
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| المؤلفون: | David Nicolas Østedgaard-Munck, Jacopo Catalano, Anders Bentien |
| المصدر: | Membranes, Vol 10, Iss 11, p 304 (2020) |
| بيانات النشر: | MDPI AG, 2020. |
| سنة النشر: | 2020 |
| المجموعة: | LCC:Chemical technology LCC:Chemical engineering |
| مصطلحات موضوعية: | electroviscous effect, ion exchange membranes, apparent solution viscosity, electrokinetic energy conversion, Chemical technology, TP1-1185, Chemical engineering, TP155-156 |
| الوصف: | Investigation of electroviscous effects is of interest to technologies that exploit transport of ions through ion exchange membranes, charged capillaries, and porous media. When ions move through such media due to a hydrostatic pressure difference, they interact with the fixed charges, leading to an increased hydraulic resistance. Experimentally this is observed as an apparent increase in the viscosity of the solution. Electroviscous effects are present in all electrochemical membrane-based processes ranging from nanofiltration to fuel-cells and redox flow batteries. Direct measurements of electroviscous effects varying the applied ionic current through Nafion membranes have, to the best of the authors’ knowledge, not yet been reported in literature. In the current study, electroviscous phenomena in different Nafion ion exchange membranes are measured directly with a method where the volume permeation is measured under constant trans-membrane pressure difference while varying the ion current density in the membrane. The direct measurement of the electroviscous effect is compared to the one calculated from the phenomenological transport equations and measured transport coefficients. Within the experimental uncertainty, there is a good agreement between the two values for all membranes tested. We report here an electroviscous effect for all Nafion membranes tested to be κH?κH−1=1.15−0.052+0.035. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2077-0375 |
| Relation: | https://www.mdpi.com/2077-0375/10/11/304; https://doaj.org/toc/2077-0375 |
| DOI: | 10.3390/membranes10110304 |
| URL الوصول: | https://doaj.org/article/d242803c14a94c3ab683b174bf1df12a |
| رقم الأكسشن: | edsdoj.242803c14a94c3ab683b174bf1df12a |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 20770375 |
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| DOI: | 10.3390/membranes10110304 |