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Schematic illustration of a microfluidic device with orthogonal pairs of IDTs for generating SAW. SAW field generated by driving IDTs at a resonance frequency can enrich and align CNTs to the substrate. The orthogonal standing SAW can manipulate the aligned CNTs to different positions with desired angle by adjusting two standing waves' phase and amplitude. The CNTs release when the SAW is turned off.
(a) A photograph of the microfluidic device. The device consists of a single PDMS channel and two pairs of IDTs deposited on a 128°Y-cut LiNbO3 substrate. (b) CNTs suspension in the channel before SAW influence. (c) The CNTs are enriched to the substrate in the channel when SAW propagate into the channel. (d) The CNTs are patterned in the channel by SSAWs. Scale bar is 50 μm.
(a) The displacement of aggregated nanotubes corresponding to the phase φ. (b) The nanotube aggregation width is constant when acoustic intensity change. (c) Stacked images used to demonstrate a CNTs bundle rotating by adjusting wave phase and amplitude of the orthogonal SSAWs. Scale bar is 20 μm.
(a) Schematic illustration of the metallic SWNTs enriching experiment. (b) Raman spectra of SWNTs deposited by SAW on the substrate compared to a reference sample deposited on the substrate without SAW.
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