“…Equations have been derived, from theoretical models, for the resonant frequency change and the resonant resistance of a quartz crystal with a coating film in contact with liquid [3,4,5,6]. Many analytical applications in gas sensing [2,7], trace ion determination [8], immunoassay [9,10], viscosity monitoring in bioprocesses [11,12,13,14], and electrochemical examinations [15,16,17,18,19] have been published [20]. Phase-transition phenomena of liquid crystals [21,22], lipid multi-bilayer films [23], Langmuir-Blodgett (LB) films [24], and blend polymers [25] have also been studied using the quartz crystal and surface acoustic wave devices.…”