A Fluorescent Probe Investigation of the Origin of Superselectivity in Perfluorinated Ionomer Membranes

Autor:	M. A. F. Robertson, H. L. Yeager
Rok vydání:	1996
Předmět:	Aqueous solution Polymers and Plastics Organic Chemistry Inorganic chemistry Fluorescence Inorganic Chemistry chemistry.chemical_compound Membrane Sulfonate chemistry Nafion Phase (matter) Materials Chemistry Pyrene Ionomer
Zdroj:	Macromolecules. 29:5166-5171
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma951616p
Popis:	The fluorescent probes pyrene and Ru(bpy)32+ were used to study the relative locations of cations and anions in microphase separated perfluorinated ionomers. After determining that these probes are located in the interfacial regions that separate the fluorocarbon phase from the ion and water-rich phase, cationic and anionic quencher ions were introduced into the system and changes in fluorescence monitored. Results show that Cs+ is located on the aqueous side of the interfacial region, in close proximity to pyrene, while I- is located deeper into the interfacial region and farther away from the aqueous phase. These differences are greater for carboxylate ionomers than for sulfonate ionomers, in close parallel to their relative abilities to discriminate against anion transport in practical membrane-based applications. These results show that the phenomenon of superselectivity is based on the differences in the average locations and therefore the transport pathways of cations and anions in perfluorinated io...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d817503a1c5a625ed1f1564a29841096 https://doi.org/10.1021/ma951616p Zobrazit plný text záznamu