Fluorous polymeric membranes for ionophore-based ion-selective potentiometry: how inert is Teflon AF?

Journal of the American Chemical Society
Chun-Ze LaiPhilippe Bühlmann

Abstract

Fluorous media are the least polar and polarizable condensed phases known. Their use as membrane materials considerably increases the selectivity and robustness of ion-selective electrodes (ISEs). In this research, a fluorous amorphous perfluoropolymer was used for the first time as a matrix for an ISE membrane. Electrodes for pH measurements with membranes composed of poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole]-co-poly(tetrafluoroethylene) (87% dioxole monomer content; known as Teflon AF2400) as polymer matrix, a linear perfluorooligoether as plasticizer, sodium tetrakis[3,5-bis(perfluorohexyl)phenyl]borate providing for ionic sites, and bis[(perfluorooctyl)propyl]-2,2,2-trifluoroethylamine as H+ ionophore were investigated. All electrodes had excellent potentiometric selectivities, showed Nernstian responses to H+ over a wide pH range, exhibited enhanced mechanical stability, and maintained their selectivity over at least 4 weeks. For membranes of low ionophore concentration, the polymer affected the sensor selectivity noticeably at polymer concentrations exceeding 15%. Also, the membrane resistance increased quite strongly at high polymer concentrations, which cannot be explained by the Mackie-Meares obstruction ...Continue Reading

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Citations

Apr 12, 2011·Analytical and Bioanalytical Chemistry·Rajani GourishettyR Daniel Johnson
May 19, 2010·Analytical Chemistry·Benjamin J PrivettMark H Schoenfisch
Nov 29, 2013·Analytical Chemistry·Renata Toczyłowska-MamińskaKrzysztof Dołowy
Nov 11, 2011·Journal of the American Chemical Society·Li D ChenPhilippe Bühlmann
Aug 21, 2009·The Journal of Biological Chemistry·Leah A Martin-VisscherJohn C Vederas
Jan 10, 2012·Computer Methods in Biomechanics and Biomedical Engineering·Seokwon PokSundararajan V Madihally
Aug 6, 2014·Journal of Chromatography. a·Dujuan Lu, Stephen Weber
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Oct 21, 2010·The Analyst·Andrew KavanaghAleksandar Radu
Oct 12, 2012·Chemical Communications : Chem Comm·Jean-Marc Vincent
Sep 4, 2020·Angewandte Chemie·Johnny HuHenri-Pierre Jacquot de Rouville
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Oct 19, 2012·Analytical Chemistry·Hong ZhangStephen G Weber
Mar 10, 2010·Journal of Electroanalytical Chemistry·Eric J OlsonPhilippe Bühlmann

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