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Acoustofluidics
Acoustofluidics is a technique to apply acoustic waves in microfluidis and rapidly grows in the research field that is addressing challenges in biology, medicine, chemistry, engineering, and physics. In particular, acoustofluidic separation of biological targets from complex fluids has proven to be a powerful tool due to the label-free, biocompatible, and contact-free nature of the technology.

Acoustophoresis
The word "Acoustophoresis" means migration with sound. It consists of two parts, where phoresis means "migration" and acousto where sound waves are the modus operandi of the movement. In similar concepts, electric forces move particles in electrophoresis and magnetic forces in magnetophoresis.

Particles in suspension exposed to an acoustic standing wave field will be affected by a radiation force. The force will cause the particle to move in the sound field if the acoustic properties of the particle differ from the surrounding medium. The magnitude of the movement depends on many factors, such as the size of the particle, the acoustic pressure amplitude and the frequency of the sound wave. The direction the particle is moved depends on the density and compressibility of the particle as well as the liquid medium. If a particle suspension in present in a channel in a dense material such as steel, silicon or glass there will be pressure anti nodes at the walls. If the width of the channel is matched to half a wavelength, there will also be a pressure node in the center of the channel.