Influence of Strongly Bound Counter-Ions on Permselective Membranes.

摘要

The research described was undertaken to understand the influence of strongly bound counter-ions on permelective membranes. One group of membranes, with sites more uniformly dispersed in the matrix, changed resistance less during poisoning but the sign of their permselectivity changed more easily. The other extreme group, membranes in which the active groups are closely crowded near each other in the spaces between the material of the matrix, increase their resistance by several orders of magnitude, but need poisoning ions of higher valency and size to change the sign of their permselectivity. Various membranes were examined with various counter-ions. Size and valency of the counter-ions varied. The counter-ions were introduced into the membranes mostly by diffusion or by direct current at room temperature but a few experiments were tried with the aid of alternating current or at elevated temperature. (Author)