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Updated: Apr 25, 2026

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

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Published on: August 21, 2018

Cell separation using tilted-angle standing surface acoustic waves.

Xiaoyun Ding¹, Zhangli Peng², Sz-Chin Steven Lin¹

¹Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802;

Proceedings of the National Academy of Sciences of the United States of America

|August 27, 2014

Summary

This summary is machine-generated.

This study introduces tilted-angle standing surface acoustic waves (taSSAW) for highly efficient, label-free cell separation. This advanced acoustic wave technique improves sensitivity and accuracy for biological and diagnostic applications.

Keywords:

acoustofluidics cancer cell separation microfluidics particle separation tilt-angle optimization

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Primary Clarification of CHO Harvested Cell Culture Fluid using an Acoustic Separator

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Area of Science:

Biophysics
Microfluidics
Cell Biology

Background:

Cell separation is crucial for research, diagnostics, and therapeutics.
Existing acoustic-based cell sorting methods lack sufficient sensitivity and efficiency.
Label-free, contactless, and biocompatible cell separation is highly desirable.

Purpose of the Study:

To develop a novel acoustic wave configuration for enhanced cell separation efficiency and sensitivity.
To optimize device design through simulations and experimental validation.
To demonstrate the application of the technique for separating biological cells, including cancer cells.

Main Methods:

Utilized a unique configuration of tilted-angle standing surface acoustic waves (taSSAW).
Employed systematic simulations of cell trajectories for device design optimization.
Experimentally validated the separation of polystyrene beads and biological cells.

Main Results:

Achieved high separation efficiencies for polystyrene beads (∼99% for 2/10 µm, ∼97% for 7.3/9.9 µm).
Demonstrated separation of particles with similar size and density but different compressibility.
Successfully sorted MCF-7 human breast cancer cells from leukocytes, preserving cell integrity.

Conclusions:

The taSSAW technique significantly improves acoustic cell separation efficiency and sensitivity.
This method enables label-free separation of cells with subtle physical property differences.
The technology holds promise for applications in circulating tumor cell detection, diagnostics, and clinical practice.