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Related Experiment Video

Updated: May 2, 2026

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

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Published on: August 21, 2018

Experimental study on inter-particle acoustic forces.

Anna Garcia-Sabaté¹, Angélica Castro², Mauricio Hoyos²

¹Departament de Física Aplicada, Universitat Politècnica de Catalunya-BarcelonaTech, c/E. Terradas 5, 08860 Castelldefels (Barcelona), Spain.

The Journal of the Acoustical Society of America

|March 11, 2014

Summary

This summary is machine-generated.

This study presents a novel method to measure inter-particle forces (secondary Bjerknes force) in acoustic fields. Researchers successfully quantified these forces between oscillating particles for the first time.

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Area of Science:

Acoustic physics
Fluid dynamics
Particle manipulation

Background:

Acoustic fields induce forces on suspended particles, leading to movement and oscillations.
Secondary Bjerknes forces become significant when particles oscillate in proximity within an acoustic field.

Purpose of the Study:

To experimentally measure inter-particle forces (secondary Bjerknes force) generated by acoustic fields in a micro-channel.
To determine the critical interaction distance for these forces.

Main Methods:

Utilized a resonator micro-channel with a water-based suspension of latex particles (5-15 μm).
Employed a 2.5 MHz ultrasonic transducer to generate standing waves.
Measured acoustic forces between oscillating particles.

Main Results:

Successfully measured inter-particle forces, specifically the secondary Bjerknes force, for the first time.
Quantified forces on the order of 10⁻¹⁴ N.
Determined critical interaction distances for particle interactions.

Conclusions:

The developed method enables direct measurement of secondary Bjerknes forces.
This research provides new insights into acoustic particle manipulation and interaction dynamics.