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. 2020 Oct 2;11(10):921. doi: 10.3390/mi11100921

Figure 3.

Figure 3

(a) TSAW-induced acoustic streaming selectively deflects droplets with fluorescent signal. Reprinted with permission from reference [60]. (b) Density-based separation by TSAW-induced acoustic streaming. With TSAW actuation, the lighter particles are distributed at the periphery and more dense particles are accumulated in the center. Reprinted with permission from reference [61]. (c) Using two IDTs with different frequencies, mixtures of three sizes of particles are separated by TSAW-induced acoustic radiation force. Reprinted with permission from reference [63]. (d) Sub-micron particles separation by TSAW. 500 nm and 300 nm particles are trapped by TSAW-induced radiation force, while 100 nm particles are not trapped due to the stronger drag force. Reprinted with permission from reference [65]. (e) Different acoustic radiation force for same-sized particles. Reprinted with permission from reference [64]. (f) Tilted-angled TSAW (TaTSAW)-induced radiation force for particle focusing and particle separation. Reprinted with permission from reference [66]. SAW—surface acoustic wave.