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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Screen-printed ultrasonic 2-D matrix array transducers for microparticle manipulation.

Yongqiang Qiu1, Han Wang1, Sylvia Gebhardt2

  • 1Institute for Medical Science and Technology, University of Dundee, Dundee, United Kingdom.

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|June 1, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a screen-printed lead zirconate titanate (PZT) ultrasonic transducer array for microparticle manipulation. The developed PZT array offers a simplified fabrication process suitable for commercialization.

Keywords:
2-D matrix arrayParticle manipulationScreen-printingThick film

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Area of Science:

  • Materials Science
  • Acoustic Engineering
  • Microfluidics

Background:

  • Developing cost-effective and scalable fabrication methods for ultrasonic transducer arrays is crucial for advanced applications.
  • Lead zirconate titanate (PZT) is a key material for piezoelectric applications, but its integration into complex arrays often requires intricate patterning.
  • Microparticle manipulation using ultrasound offers precise, non-contact control for various scientific and industrial processes.

Purpose of the Study:

  • To develop and characterize a two-dimensional thick film PZT ultrasonic transducer array using screen-printing.
  • To demonstrate the feasibility of this fabrication technique for microparticle manipulation applications.
  • To assess the potential for commercialization of screen-printed PZT devices for ultrasonic manipulation.

Main Methods:

  • Screen-printing of all layers on an alumina substrate without subsequent patterning.
  • Characterization using electrical impedance spectroscopy and laser vibrometry.
  • Finite element analysis for array optimization.
  • Demonstration of microparticle manipulation with Ø10μm polystyrene microspheres.

Main Results:

  • A 7.5MHz PZT array with a thickness of 139±2μm and element pitch of 2.3mm was successfully fabricated.
  • Measured relative dielectric constant of 2250±100 and dielectric loss of 0.09±0.005 at 10kHz.
  • Single element surface motion reached tens of nanometres with 10Vpeak excitation.
  • Successful manipulation of 10μm polystyrene microspheres in degassed water.

Conclusions:

  • Screen-printing provides a simplified and potentially scalable fabrication route for PZT ultrasonic transducer arrays.
  • The developed array demonstrates effective microparticle manipulation capabilities.
  • The technique holds promise for the commercialization of cost-effective multilayer planar resonant devices for ultrasonic applications.