Acoustophoresis separation method

Details Acoustophoresis separation method Acoustophoresis separation method

1992-06-17

1993-03-09

Dawson, Robert A.

Liquid purification or separation

Processes

Utilizing electrical or wave energy directly applied to...

55277, 210767, 210806, 406197, B01D 1706

Patent

active

051924501

ABSTRACT:
A method and apparatus are provided for acoustophoresis, i.e., the separation of species via acoustic waves. An ultrasonic transducer applies an acoustic wave to one end of a sample container containing at least two species having different acoustic absorptions. The wave has a frequency tuned to or harmonized with the point of resonance of the species to be separated. This wave causes the species to be driven to an opposite end of the sample container for removal. A second ultrasonic transducer may be provided to apply a second, oppositely directed acoustic wave to prevent undesired streaming. In addition, a radio frequency tuned to the mechanical resonance and coupled with a magnetic field can serve to identify a species in a medium comprising species with similar absorption coefficients, whereby an acoustic wave having a frequency corresponding to this gyrational rate can then be applied to sweep the identified species to one end of the container for removal.

REFERENCES:
patent: 4759775 (1988-07-01), Peterson et al.
patent: 4877516 (1989-10-01), Schram
patent: 5085783 (1992-02-01), Feke et al.
patent: 5128043 (1992-07-01), Wildermuth

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