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Equilibrium potentials at the polymer-water interface

โœ Scribed by R.D. Armstrong; M.L. Marcos

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
767 KB
Volume
37
Category
Article
ISSN
0013-4686

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โœฆ Synopsis

From emJ impedance and linear sweep voltammetry measurements., equilibrium potentials at the interface between aqueous solutions and PVGbased plasticized (with di-octyl sebacate or o-nitrophenyl octyl ether) membranes have been determined for the ionic species AsPhi+, NMe,+ , NEt,+ , BP&, K+ and Cal+. In the last two cases ionophores were pzwent in the membrane, valinomycin for K+ and ETH129 for Ca2+. A vokammetric wave has been found for the transfer of NE@ from the water to the membrane phase. From the partition codficient of AsPh,BPh, between the two phases, the free energies of transfer have been evaluated.

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Measurements have been made of the double layer capacity at the polymer-water interface. The measurements suggest that the major contribution to the capacity arises from a diffuse layer of charge in the polymer phase.