Related Experiment Video
Updated: Jan 15, 2026
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
17.7K
Acoustic Streaming-Induced Vortex Chromatography in Micron-Scale Rectangular Open Tubular Channels
Elahe Naghdi1, Dariush Bahrami Eisaabadi1, Wim De Malsche1
1μFlow Group, Department of Chemical Engineering, Vrije Universiteit Brussel, 1050 Brussels, Belgium.
Analytical Chemistry
|October 8, 2025
Summary
Acoustic waves in microfluidic channels reduce dispersion, significantly enhancing separation resolution. This breakthrough offers a 10x improvement, mimicking a 1 μm critical dimension for chromatography.
Area of Science:
- Analytical Chemistry
- Microfluidics
- Physical Chemistry
Background:
- Separation resolution in pressure-driven devices is limited by Taylor-Aris dispersion.
- Lateral flow strategies have been proposed to mitigate this dispersion.
- Acoustic streaming offers a novel approach to induce lateral flow.
Purpose of the Study:
- To introduce acoustic-based lateral flow into microfluidic channels.
- To reduce Taylor-Aris dispersion and improve separation resolution.
- To demonstrate the application in macromolecule separation.
Main Methods:
- Inducing acoustic streaming by matching acoustic wavelength with channel depth.
- Experimental validation in a 10 μm × 75 μm microfluidic channel.
- Numerical simulations to assess further improvements and impact of imperfections.
Main Results:
- Acoustic streaming reduced Taylor-Aris dispersion by a factor of 10.
- Achieved a chromatographic system behaving as if it has a 1 μm critical dimension.
- Demonstrated improved chromatographic separation efficiency for macromolecules under reverse-phase conditions.
Conclusions:
- Acoustic-based lateral flow is an effective strategy to reduce Taylor-Aris dispersion in microfluidic systems.
- This method significantly enhances chromatographic separation resolution.
- The approach shows promise for advanced analytical separations, including macromolecule analysis.
