Acoustofluidics 7: The acoustic radiation force on small particles
1Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Denmark. Henrik.Bruus@nanotech.dtu.dk
Lab on a Chip
|February 22, 2012
Summary
This paper explains the acoustic radiation force, a key principle behind acoustofluidics. It details how this force drives the movement of microparticles in ultrasound fields for manipulation.
Area of Science:
- Acoustofluidics
- Biophysics
- Nanotechnology
Background:
- Microfluidic systems are increasingly used for cell and particle manipulation.
- Ultrasonic standing waves offer precise control in microfluidic devices.
- Understanding the forces involved is crucial for optimizing acoustofluidic applications.
Purpose of the Study:
- To present the theoretical framework of the acoustic radiation force.
- To explain its role in the acoustophoretic motion of microparticles.
- To serve as part of a tutorial series on acoustofluidics.
Main Methods:
- Theoretical analysis of acoustic radiation force.
- Explanation of second-order, time-averaged effects.
- Focus on particle dynamics in ultrasound fields.
Main Results:
- The acoustic radiation force is a second-order, time-averaged effect.
- This force is responsible for the acoustophoretic motion of microparticles.
- The theory applies to micrometre-sized particles suspended in an ultrasound field.
Conclusions:
- The acoustic radiation force is fundamental to acoustofluidic particle manipulation.
- A clear theoretical understanding enables better design of acoustofluidic devices.
- This work contributes to the broader understanding of acoustofluidics.
