Dielectric properties of polymer electrolyte membranes measured by two-port transmission line technique

Z. Lu, M. Lanaganb, Evangelos Manias, D. D. Macdonald

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

The microwave dielectric properties of perfluorosulfonic acid membranes are characterized by a two-port transmission line technique. Two dielectric relaxation modes are observed in the microwave region (0.045-26 GHz) at 25°C The higher frequency process observed is identified as the cooperative relaxation of bulk-like water, whose amount was found to increase linearly with water content in the polymer. The lower-frequency process, characterized by longer relaxation times in the range of 20-70 picoseconds, is attributed to water molecules that are loosely bound to sulfonate groups. The loosely bound water amount was found to increase with hydration level at low water content, and levels-off at higher water contents. Flemion SH150, which has an equivalent weight of 909 g/equiv, displays higher dielectric strengths for both of these water modes compared to Nafion 117 (equivalent weight of 1100 g/equiv).

Original languageEnglish (US)
Title of host publicationElectrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire)
Pages95-105
Number of pages11
Volume28
Edition29
DOIs
StatePublished - Dec 1 2010
EventElectrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire) - 217th ECS Meeting - Vancouver, BC, Canada
Duration: Apr 25 2010Apr 30 2010

Other

OtherElectrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire) - 217th ECS Meeting
CountryCanada
CityVancouver, BC
Period4/25/104/30/10

Fingerprint

Dielectric properties
Electric lines
Electrolytes
Water content
Membranes
Polymers
Water
Microwaves
Dielectric relaxation
Water levels
Hydration
Relaxation time
Molecules
Acids

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Lu, Z., Lanaganb, M., Manias, E., & Macdonald, D. D. (2010). Dielectric properties of polymer electrolyte membranes measured by two-port transmission line technique. In Electrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire) (29 ed., Vol. 28, pp. 95-105) https://doi.org/10.1149/1.3502448
Lu, Z. ; Lanaganb, M. ; Manias, Evangelos ; Macdonald, D. D. / Dielectric properties of polymer electrolyte membranes measured by two-port transmission line technique. Electrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire). Vol. 28 29. ed. 2010. pp. 95-105
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Lu, Z, Lanaganb, M, Manias, E & Macdonald, DD 2010, Dielectric properties of polymer electrolyte membranes measured by two-port transmission line technique. in Electrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire). 29 edn, vol. 28, pp. 95-105, Electrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire) - 217th ECS Meeting, Vancouver, BC, Canada, 4/25/10. https://doi.org/10.1149/1.3502448

Dielectric properties of polymer electrolyte membranes measured by two-port transmission line technique. / Lu, Z.; Lanaganb, M.; Manias, Evangelos; Macdonald, D. D.

Electrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire). Vol. 28 29. ed. 2010. p. 95-105.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - The microwave dielectric properties of perfluorosulfonic acid membranes are characterized by a two-port transmission line technique. Two dielectric relaxation modes are observed in the microwave region (0.045-26 GHz) at 25°C The higher frequency process observed is identified as the cooperative relaxation of bulk-like water, whose amount was found to increase linearly with water content in the polymer. The lower-frequency process, characterized by longer relaxation times in the range of 20-70 picoseconds, is attributed to water molecules that are loosely bound to sulfonate groups. The loosely bound water amount was found to increase with hydration level at low water content, and levels-off at higher water contents. Flemion SH150, which has an equivalent weight of 909 g/equiv, displays higher dielectric strengths for both of these water modes compared to Nafion 117 (equivalent weight of 1100 g/equiv).

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Lu Z, Lanaganb M, Manias E, Macdonald DD. Dielectric properties of polymer electrolyte membranes measured by two-port transmission line technique. In Electrochemical Engineering for the 21st Century (Dedicated to Richard C. Alkire). 29 ed. Vol. 28. 2010. p. 95-105 https://doi.org/10.1149/1.3502448