The Thermal Membrane Potential as a Function of the Apparent Ionic Transport Number of Membranes

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Abstract
The thermal membrane potential (TMP) has been studied as a function of the apparent ionic transport number of ionselective membranes. The temperature coefficient of TMP, the thermoelectric power, has been found to be a continuously increasing function of the apparent ionic transport number of the membranes used, starting from zero at the neutral point, where the membrane exhibits no selectivity for ions, and approaching with acceleration when the ionic transport number of the membrane is increased until it reaches its highest limit at the perfect ion permselectivity. The sign of the thermoelectric power has been found to be positive for negative membranes, and negative for positive membranes. The absolute value of the thermoelectric power is higher for positive membranes than for negative membranes at equivalent degrees of ion permselectivity.

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