Abstract
A surface acoustic wave (SAW) sensor system utilizing a SAW resonator operating at 61 MHz and a pair of parallel electrodes in series was applied to the detection of organic mixtures. Linear frequency shifts were observed as the water content of organic solvents changed. The detection limit was 2 mg l −1. The behaviour of the dielectric constant and conductivity of the lipid multibilayer during phase transition (from solid to liquid crystal) was measured with the SAW sensor system using polymer-coated eletrodes. Large frequency changes were also observed for lecithin extracted from egg yolk at the phase transition temperature.
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