Rectification Effects Using Polyelectrolyte Solutions

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Abstract
The rectifying properties of liquid junctions of polyelectrolyte solutions are examined and discussed. In the case of liquid junctions between aqueous solutions of poly(styrene-sulfonic acid) and poly(2-vinyl-N-n-butylpyridinium hydroxide), the rectification effects greatly depend on the concentrations of the polyelectrolytes and on the frequencies of the voltages applied, that is, rectification effects can not be found when the concentrations of polyelectrolytes are lower than 0.68×10−3 equivalents per liter and when the frequencies of the alternating voltages are higher than 200 cps. The mechanism of rectification can be explained to some extent by a semiconductor analogy. In the case of liquid junctions between poly(styrene-sulfonic acid) and poly(2-vinyl-N-n-butylpyridinium bromide), the static current versus voltage curves have strong hysteresis loops. The rectification effects can be slightly observed when alternating voltages with frequencies lower than 100 cps are applied. In this case, however, the mechanism of rectification can not be explained by the semiconductor analogy.

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