Accession Number : ADA140824

Title :   Ion Exchange Selectivity of Nafion Films on Electrode Surfaces.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY

Personal Author(s) : Szentirmay,M N ; Martin,C R

PDF Url : ADA140824

Report Date : 01 May 1984

Pagination or Media Count : 35

Abstract : Films of 1100 EW Nafion were coated onto glassy carbon electrode surfaces and these chemically modified electrodes were used to characterize the ion exchange selectivity of the polymer. This was accomplished by allowing electrodes to equilibrate with solutions of various electroactive counterions and then determining the quantity of ion incorporated into the films coulometrically. These data were used to calculate both ion exchange partition and selectivity coefficients. Ion exchange selectivity coefficients (vs. Na(+)) for hydrophobic, organic counterions were very large (10,000 to 6 x 6,000,000) confirming earlier work which suggested that Nafion preferentially incorporates such counterions. The implications of this unusual ion exchange selectivity to electroanalysis are discussed. (Author)

Descriptors :   *Polymeric films, *Ion exchange resins, *Ion exchange, *Electrodes, Surfaces, Coatings, Fluoropolymers, Sulfonates, Ionomers, Solid electrolytes, Glassy carbon, Equilibrium(General), Selection, Coefficients, Sodium, Hydrophobic properties

Subject Categories : Physical Chemistry
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE