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박광석(Kwangseok Park),박진수(Jinsoo Park),정진호(Jin Ho Jung),굴람 데스트기르(Ghulam Destgeer),후스네인 아메드(Husnain Ahmed),라힐 아마드(Raheel Ahmad),성형진(Hyung Jin Sung) 한국가시화정보학회 2017 한국가시화정보학회지 Vol.15 No.1
In droplet-based microfluidic systems, in-droplet preconcentration of a sample is one of the important prerequisites for biochemical or medical analysis. There have been a few studies on preconcentration in a moving droplet, but they are limited to practical applications since 1) their method are time-consuming or 2) they require specific properties such as electric and magnetic properties. In this study, we demonstrated the position control of polystyrene particles of 5 and 10 μm in diameter inside a moving water-in-oil droplet using traveling surface acoustic waves. Since the frequencies for effective control of each diameter were found, microparticles with no labels could be utilized. In addition, the proposed method enabled on-demand preconcentration inside a polydimethylsiloxane microchannel. In-droplet preconcentration of microparticles was realized by splitting a mother droplet with manipulated particles at a downstream bifurcation zone. Given these advantages, the proposed system is a promising acoustofluidic lab-on-a-chip platform for preconcentration inside a droplet.