Multilayered piezoelectric resonator for the separation of suspe

Details Multilayered piezoelectric resonator for the separation of suspe Multilayered piezoelectric resonator for the separation of suspe

1993-07-02

1996-06-18

Cintins, Ivars

Liquid purification or separation

With means to add treating material

209155, C02F 136

Patent

active

055274609

ABSTRACT:
Particulate material suspended in a fluid is separated and recycled by means of an ultrasonic resonance wave. In a preferred embodiment, the ultrasonic resonance field is generated within a multilayered composite resonator system including a transducer, the suspension and a mirror parallel to each other. Dimensions and frequencies resonant to the whole system but not exciting Eigen-frequencies of transducer and mirror itself are chosen so that thermal dissipation is minimized. Generally, the process is suitable for all kinds of particles (solid, liquid or gaseous disperse phases) especially for hydrosols (particles in water) and for separation of biological particles such as mammalian, bacterial and plant cells or aggregates. Specialized applications in biotechnology are described including an acoustic filter for mammalian cell bioreactors or the selective retention of viable cells relative to non-viable cells.

REFERENCES:
patent: 4055491 (1977-10-01), Porath-Furedi
patent: 4523682 (1985-06-01), Barmatz et al.
patent: 4673512 (1987-06-01), Schram
patent: 4759775 (1988-07-01), Peterson et al.
patent: 4877516 (1989-10-01), Schram
patent: 5164094 (1992-11-01), Stuckart
patent: 5225089 (1993-07-01), Benes et al.
Benes, E. et al., "Abscheidung Dispergierter Teilchen Durch Ultraschallinduzierte Koagulation," Tagung der Deutschen Arbeitsgameinschaft fur Akustik-DAGA '89, 1989.
Hager, F., and E. Benes, "A Summary of All Forces Acting on Spherical Particles in a Sound Field," Proc. of the Ultrasonic International'91 Conference and Exhibition, Le Touquet, France, Jul. 1991.
Apfel, R. E., "Acoustic Radiation Pressure--Principles and Application to Separation Science," Fortschritte der Akustik-DAGA '90, pp. 19-36, 1990.
Mandralis, Z. I., et al., "Transient Response of Fine Particle Suspensions to Mild Planar Ultrasonic Fields," Fluid/Particle Sep. J. 3(3):115-121, Sep. 1990.
Kilburn, D. G., et al., "Enhanced Sedimentation of Mammalian Cells Following Acoustic Aggregation," Biotech. and Bioeng. 34:559-562, 1989.
Groschl, M., and E. Benes, "Automatische Frequenzregelung fur Piezoelektrische Resonatoren und deren Implementierung im akustischen Driftwellenresonator," Diplomarbeit Institut fur Allgemeine Physik, Technischen Universitat Wien, Nov. 1991.
Nowotny, H., et al., "Layered Piezoelectric Resonators With an Arbitrary Number of Electrodes," J. Acoust. Soc. Am. 90(3):1238-1245, Sep. 1991.
Benes, E., "Improved Quartz Crystal Microbalance Technique," J. Appl. Phys. 58(3):608-626, Aug. 1981.
Curtis, H. W. and E. J. Stephans, "Ultrasonic Continuous Flow Plasmapheresis Separator," IBM Technical Disclosure Bulletin, vol. 25, No. 1, Jun. 1982.

Affiliated with

Also associated with

Rating

Multilayered piezoelectric resonator for the separation of suspe does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multilayered piezoelectric resonator for the separation of suspe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multilayered piezoelectric resonator for the separation of suspe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-220630