Non-linear relaxation in asymmetric membrane cells

✍ Scribed by J.E. Anderson; W. Pusch

• Publisher: Elsevier Science
• Year: 1977
• Weight: 338 KB
• Volume: 11
• Category: Article
• ISSN: 0378-4487
• DOI: 10.1016/0378-4487(77)80038-1

✦ Synopsis

Non-linear electric relaxation was studied in asymmetric membrane cells: solution A/membrane/solution B. Solutions A and B in either concentration or composition. The conductivity of these cells exhibit time-dependent rectification: this is understood as electricallyinduced concentration changes within the membrane. Step current, step voltage and sinesoidal measurements are presented, along with a simple relaxation model which reproduces the experimental data. Oscillating response functions are observed with some cells. conductivity (4 x 10 -4 mho/cm2). This is followed by a slow voltage decrease to -0.4.V: the conductivity increases with time and the system acts like a RL network. Corresponding response curves are obtained when voltage-steps are applied (Fig. 1). Here the response curves show resistance changes rather than conductivity changes. 1.2 2 0.8 $ 0.4 r: B 0 -0.4 _ 16.2 "E e 10.8 5 '5.6 z 2 0 5 u -5.4 -10.8 , _y 10