Abstract
Abstract A novel method for transporting micro-fluids in vertical direction is presented, by which a paper-based micro-fluidic device can implement pretreatment operations of samples. Interdigital transducers (IDTs) and reflectors were fabricated on a 128° yx-LiNbO 3 substrate using micro-electric technique. A paper-based micro-fluidic device was placed on PDMS blocks, which were mounted on a piezoelectric substrate. The space between the paper-based micro-fluidic device and the piezoelectric substrate is 2 mm. Two surface acoustic waves (SAWs) in opposite transportation directions were excited when an amplified RF signal was applied to the IDTs. And then, the micro-fluid to be analyzed was transported vertically to the paper substrate by the SAWs. The transportation experiments were carried out using red dye solution micro-fluids with different volumes. The results indicated that the volume of the micro-fluid and the RF signal power can affect the successful transportation of the micro-fluid from the piezoelectric substrate to the paper substrate. The detection of NO 2 − was also examined using the presented method.
Published Version
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