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Manipulation of a Micro Droplet in a Capillary Tube by Using a Flexural Acoustic Wave
New Phys.: Sae Mulli 2019; 69: 766~770
Published online July 31, 2019;
© 2019 New Physics: Sae Mulli.

Jae-Sik PARK, Sung-Hyun KIM, Min-Hwan LEE, Eun-Sun KIM, In-Kag HWANG*

Department of Physics, Chonnam National University, Gwangju 61186
Correspondence to:
Received April 30, 2019; Revised June 20, 2019; Accepted June 20, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We demonstrated the precise motion of a nanoliter-volume oil droplet in a capillary tube by using a flexural acoustic wave. An acoustic standing wave was excited between a compact co-axial acoustic transducer and the free end of the capillary tube. The liquid droplet was trapped at an antinode of the standing wave thus, the position of the droplet could be controlled by tuning the positions of the acoustic antinodes or the acoustic frequency. The position control was achieved over the entire length (15~cm) of the acoustic interaction region of the capillary tube to a precision of a few tens of $\mu$m.
PACS numbers: 43.35.+d, 43.38.+n
Keywords: Droplet, Acoustic manipulation, Microfluidics

July 2019, 69 (7)
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