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1575788 
Journal Article 
Transporting Microfluids in Vertical Direction Using Surface Acoustic Wave 
Zhang An-Liang; Wei Yi-Qing; Han Qing-Jiang; Wu Zeng-Qiang; Xia Xing-Hua 
2011 
Yes 
Chinese Journal of Analytical Chemistry / Fen Xi Hua Xue
ISSN: 0253-3820 
39 
12 
1805-1810 
WOS:000300598000005 
A new method of transporting micro-fluid in vertical direction is presented, which can make paper-based microflidic devices implement pretreatment operations of samples. Interdigital transducers (IDTs) and reflectors were fabricated on a 128 degrees yx-LiNbO3 substrate using microelectric technique, and a paper based microfluidic device was then placed on polydiomethylsiloxane (PDMS) blocks, which was mounted on the piezoelectric substrate. The space between the paper-based microfluidic device and the piezoelectric substrate was 2 mm. Two surface acoustic waves (SAWs) in opposite directions were excited when an amplified RF signal was applied to the IDTs. And then, the microfluid 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 show that the volume of microfluid and the RF power can affect the successful transportation of the microfluid from the piezoelectric substrate to paper substrate. The detection of NO2- was also examined using the presented method. 
Surface acoustic wave; Micro-fluidic analysis; Interdigital transducer; Paper substrate; Micro-fluid