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  Wireless actuation with functional acoustic surfaces

Qiu, T., Palagi, S., Mark, A. G., Melde, K., Adams, F., & Fischer, P. (2016). Wireless actuation with functional acoustic surfaces. Applied Physics Letters, 109(19): 191602, pp. 191602-1-191602-4. doi:10.1063/1.4967194.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-1B0D-A Version Permalink: https://hdl.handle.net/21.11116/0000-000B-1B0E-9
Genre: Journal Article

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 Creators:
Qiu, T., Author
Palagi, S., Author
Mark, A. G., Author
Melde, K., Author
Adams, F., Author
Fischer, P.1, Author           
Affiliations:
1Optical Nanoscopy, Max Planck Institute for Medical Research, Max Planck Society, ou_2364730              

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 Abstract: Miniaturization calls for micro-actuators that can be powered wirelessly and addressed individually. Here, we develop functional surfaces consisting of arrays of acoustically resonant micro-cavities, and we demonstrate their application as two-dimensional wireless actuators. When remotely powered by an acoustic field, the surfaces provide highly directional propulsive forces in fluids through acoustic streaming. A maximal force of ∼0.45 mN is measured on a 4 × 4 mm2 functional surface. The response of the surfaces with bubbles of different sizes is characterized experimentally. This shows a marked peak around the micro-bubbles' resonance frequency, as estimated by both an analytical model and numerical simulations. The strong frequency dependence can be exploited to address different surfaces with different acoustic frequencies, thus achieving wireless actuation with multiple degrees of freedom. The use of the functional surfaces as wireless ready-to-attach actuators is demonstrated by implementing a wireless and bidirectional miniaturized rotary motor, which is 2.6 × 2.6 × 5 mm3 in size and generates a stall torque of ∼0.5 mN·mm. The adoption of micro-structured surfaces as wireless actuators opens new possibilities in the development of miniaturized devices and tools for fluidic environments that are accessible by low intensity ultrasound fields.

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Language(s): eng - English
 Dates: 2016-08-252016-10-202016-11-072016
 Publication Status: Issued
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.4967194
BibTex Citekey: 2016qiu
 Degree: -

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Title: Applied Physics Letters
  Abbreviation : Appl. Phys. Lett.
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 109 (19) Sequence Number: 191602 Start / End Page: 191602-1 - 191602-4 Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223