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Related Experiment Video

Updated: May 26, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
12:26

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Uniform mixing in paper-based microfluidic systems using surface acoustic waves.

Amgad R Rezk1, Aisha Qi, James R Friend

  • 1Micro/Nanophysics Research Laboratory, School of Electrical & Computer Engineering, RMIT University, Melbourne, VIC 3000, Australia.

Lab on a Chip
|December 24, 2011
PubMed
Summary
This summary is machine-generated.

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Surface acoustic waves enable rapid and consistent mixing in paper-based microfluidic devices, overcoming limitations of passive methods. This advance enhances potential for low-cost, point-of-care diagnostics.

Area of Science:

  • Microfluidics
  • Diagnostics
  • Acoustics

Background:

  • Paper-based microfluidics offer low-cost, accessible platforms for point-of-care diagnostics.
  • Conventional passive mixing in paper devices suffers from irreproducibility and poor control.
  • Integrating active fluid manipulation is key to expanding paper microfluidic functionality.

Purpose of the Study:

  • To introduce a convective actuation mechanism using surface acoustic waves (SAW) for fluid mixing in paper microfluidics.
  • To compare the efficiency and speed of SAW-driven mixing against traditional capillary-driven passive mixing.
  • To evaluate the impact of varying parameters on SAW-driven mixing performance.

Main Methods:

  • A Y-channel paper-based microfluidic device was fabricated.

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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Published on: August 21, 2018

Related Experiment Videos

Last Updated: May 26, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
12:26

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
10:12

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

Published on: June 12, 2015

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
06:51

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Published on: August 21, 2018

  • Surface acoustic waves (30 MHz) were employed for convective fluid actuation and mixing.
  • A novel hue-based colorimetric technique was developed for quantifying mixing efficiency.
  • Mixing was compared between SAW-driven and capillary-driven methods under varied conditions.

    • Main Results:

    • SAW-driven mixing demonstrated consistent and rapid performance in the paper microfluidic device.
    • SAW mixing overcame limitations of capillary-driven methods, such as poor control and backflow.
    • The hue-based colorimetric technique provided reliable quantification of mixing, independent of sample color contrast.

    Conclusions:

    • Surface acoustic waves provide an effective method for active fluid manipulation and mixing in paper-based microfluidic systems.
    • This approach significantly improves upon the limitations of passive mixing, enhancing device reliability.
    • The developed hue-based quantification method is suitable for various on-chip assays, including immunochromatographic assays.