Anna Gilardoni, Elena Margheri, Gabriella Gabrielli
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Potassium ion selective membranes built by the Langmuir—Blodgett technique
Spreading monolayers of the ionophore valinomycin in mixtures with methyl stearate with different molar ratios were studied at the air/water interface in the 15–30 C temperature range.
The bidimensional miscibility of the two components was deduced by recording spreading isotherms, which allowed also the evaluation of the thermodynamic parameters ΔGmix, ΔHmix and TΔSmix.
Languir—Blodgett (LB) films of mixtures with various molar ratios were built by transferring spreading monolayers from the air/water interface on to hydrophobic and hydrophilic substrates, and their electrical resistance was determined using KCl and NaCl solutions in the 10−3-5·10−1M concentration range.
It was verified that valinomycin-containing mixtures showed K− ion selectivity in LB films, at an opportune molar ratio between the two components.
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