SELF-DIFFUSION AND CONDUCTIVITY IN NAFION(R) MEMBRANES IN CONTACT WITH NACL+CACL2 SOLUTIONS

Authors
POURCELLY G SISTAT P CHAPOTOT A GAVACH C NIKONENKO V
Citation
G. Pourcelly et al., SELF-DIFFUSION AND CONDUCTIVITY IN NAFION(R) MEMBRANES IN CONTACT WITH NACL+CACL2 SOLUTIONS, Journal of membrane science, 110(1), 1996, pp. 69-78
Citations number
26
Categorie Soggetti
Engineering, Chemical","Polymer Sciences
Journal title
Journal of membrane science → ACNP
ISSN journal
03767388
Volume
110
Issue
1
Year of publication
1996
Pages
69 - 78
Database
ISI
SICI code
0376-7388(1996)110:1<69:SACINM>2.0.ZU;2-2
Abstract
The ion-exchange isotherm of sodium and calcium ions is drawn for the Nafion(R) 117 membrane in contact with [ NaCl] + 2 [CaCl2] = 0.1 M. Th e self-diffusion coefficients of sodium and calcium ions, obtained fro m steady-state self-diffusion ionic fluxes by a radiotracer method are independent of the ionic composition of the membrane phase. They are compared to those obtained from high frequency electrical resistance b y means of the ac impedance technique. The values of electric conducti vity of the membrane can be derived from a simple additivity law.