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Related Experiment Video

Updated: Jun 25, 2025

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

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

Published on: August 27, 2013

Surface acoustic wave digital microfluidics with surface wettability gradient.

Yaodong Zhang¹, Ying Yang¹

¹College of Aerospace Engineering, State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R. China. yingyang@nuaa.edu.cn.

|May 23, 2024

Summary

This summary is machine-generated.

This study introduces a novel digital microfluidic system combining surface acoustic waves and wettability gradients for precise droplet manipulation. This technology enhances multi-droplet reactions and micrometer-level positional accuracy.

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Last Updated: Jun 25, 2025

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

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

Published on: August 27, 2013

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

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A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice

A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice

Published on: November 23, 2015

Area of Science:

Microfluidics
Acoustic Wave Technology
Surface Science

Background:

Digital microfluidics offers precise fluid control but faces challenges in multi-droplet manipulation and positional accuracy.
Surface acoustic waves (SAW) provide non-contact manipulation capabilities for microscale systems.
Surface wettability gradients can influence droplet movement and localization.

Purpose of the Study:

To develop a digital microfluidic technology integrating surface acoustic waves and wettability gradients.
To enhance the selection of driven objects and enable sequential reactions among multiple droplets.
To improve the positional accuracy of droplets in microfluidic systems.

Main Methods:

Fabrication of octagonal patterns with a wetting gradient on a LiNbO3 wafer using photolithography.
Integration of orthogonally distributed interdigital transducers for surface acoustic wave generation.
Utilizing SAW propagation characteristics on different wetting models for microfluidic motion control.

Main Results:

Successful selection of driven objects and demonstration of sequential reactions among multiple droplets.
Droplets exhibited controlled movement along the wetting gradient under standing SAW excitation.
Achieved micrometer-level positional accuracy for droplets, significantly enhancing precision.

Conclusions:

The combined surface acoustic wave and wettability gradient digital microfluidic technology effectively addresses challenges in multi-droplet manipulation.
This approach significantly improves droplet positional accuracy, enabling more precise microfluidic operations.
The developed technology holds promise for advanced applications in lab-on-a-chip devices and biochemical assays.