Surface Acoustic Wave Enhancing Drop-Drop Microextraction with an Original Position Loop for Stabilizing Drops

Author： Zhang An-Liang Fu Xiang-Ting Zha Yan

ISSN： 0015-0193

Source： Ferroelectrics, Vol.445, Iss.1, 2013-01, pp. : 152-160

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

A surface acoustic wave based drop-drop microextraction, in which an original position loop is used for stabilizing drops, is proposed. An interdigital transducer with 27.5 MHz center frequency was fabricated on a 128° yx-LiNbO₃ piezoelectric substrate for exciting surface acoustic wave. Mass transfer of extractive matter between two liquid phases was enhanced due to acoustic streaming caused by radiation of surface acoustic wave. An original position loop, which was used to prevent extraction liquid from movement along the surface of piezoelectric substrate, was fixed on the substrate with 1 mm gap. An ionic liquid and an organic dye (acid green-25) solution were used for extraction experiments. Results show that the extraction time is greatly decreased due to surface acoustic wave radiation, and extraction process can be finished within two minutes at 30.0 dBm RF signal power.