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(a) Schematic of the flexible thin film ZnO/polyimide SAW devices and photographs of the IDT design and fabricated devices. (b) Schematics and photographs of induced acoustic streaming in a surface droplet along with measurements of the streamlining velocity as a function of the applied voltage and images showing the concentration of particles in the droplet. Adapted by permission from Macmillan Publishers Ltd: Ref. [103], 2013.
