Journal
LAB ON A CHIP
Volume 15, Issue 13, Pages 2896-2905Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5lc00083a
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Funding
- ETH microscopy and screening center
- ETH Zurich
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Droplet microfluidics has emerged as a prospering field for lab-on-a-chip devices, where droplets serve as liquid vessels e.g. for biochemical reagents. Key to the fluid processing in droplet format are the controlled droplet handling and movement on the microscale. Hence this paper proposes droplet handling by combining droplet microfluidics with bulk acoustic wave (BAW) acoustophoresis. BAW acoustophoresis has formerly focused on cell and particle handling, whereas here we determine the various abilities of this method for the field of droplet microfluidics. In silicon microdevices, water-in-oil droplets of 200 mu m size were generated for a set of unit operations including droplet fusion, focusing, sorting and medium exchange around 0.5-1 MHz acoustic frequency. Compared to existing droplet handling methods, the shown method is simple in fabrication, robust in operation and versatile to meet the needs of various droplet processing microfluidic devices.
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