Journal
LAB ON A CHIP
Volume 21, Issue 5, Pages 904-915Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0lc01012j
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Funding
- University of California
- National Science Foundation [ECCS-1542148]
- W.M. Keck Foundation
- Office of Naval Research [12368098]
- NANO3 facility at UC San Diego
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This study introduces a novel omnidirectional spiral surface acoustic wave (OSSAW) design for efficient separation of particles in microliter droplets, successfully extracting separated particles for the first time. The technology shows potential for whole blood separation and point-of-care diagnostics.
Asymmetric surface acoustic waves have been shown useful in separating particles and cells in many microfluidics designs, mostly notably sessile microdroplets. However, no one has successfully extracted target particles or cells for later use from such samples. We present a novel omnidirectional spiral surface acoustic wave (OSSAW) design that exploits a new cut of lithium niobate, 152 Y-rotated, to rapidly rotate a microliter sessile drop to similar to 10 g, producing efficient multi-size particle separation. We further extract the separated particles for the first time, demonstrating the ability to target specific particles, for example, platelets from mouse blood for further integrated point-of-care diagnostics. Within similar to 5 s of surface acoustic wave actuation, particles with diameter of 5 mu m and 1 mu m can be separated into two portions with a purity of 83% and 97%, respectively. Red blood cells and platelets within mouse blood are further demonstrated to be separated with a purity of 93% and 84%, respectively. These advancements potentially provide an effective platform for whole blood separation and point-of-care diagnostics without need for micro or nanoscale fluidic enclosures.
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