Abstract
A rapid droplet-to-droplet microextraction method on a piezoelectric substrate was presented. A pair of interdigital transducers (IDTs) with 27.5MHz center frequency was fabricated on a 128° yx-LiNbO3 substrate using microelectric technology. A RF signal generated by a signal generator was applied to one of the IDTs to excite surface acoustic wave. When hit a droplet on the piezoelectric substrate, surface acoustic wave was radiated into the droplet and acoustic streaming was occurred. Droplet-to-droplet microextraction was enhanced due to the acoustic streaming. An ionic liquid and an organic dye solution were used for extraction experiments. Results show that the extraction time is decreased with RF signal power. In addition, extraction kinetics was also studied using an image-based concentration measurement technique.
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