Process for manipulating microscopic, dielectric particles and a

Details Process for manipulating microscopic, dielectric particles and a Process for manipulating microscopic, dielectric particles and a

1995-07-27

2000-11-21

Beisner, William H.

Chemistry: electrical and wave energy

Processes and products

Electrophoresis or electro-osmosis processes and electrolyte...

204643, G01N 2726, G01N 27447

Patent

active

061497894

ABSTRACT:
Disclosed is a process for manipulating microscopic dielectric particles in which particles are exposed to an electric field. In disadvantaged processes the particles are exposed to inhomogeneous electric field and are polarized by them. The polarized particles are moved in the direction of higher field strength. These processes permit no reversal of the traveling direction of the particles. The particles are enriched at the electrode so that they cannot be retained in free space. In the invented process the particles are exposed to high-frequency field traveling in one or more prescribed direction, by which the particles are subject to a force which sets them in a motion that is strongly synchronous to the field. With the aid of a device for carrying out the invented process, the particles can be manipulated very flexibly. By means of linearly or circularly disposed electrodes, the particles can be moved on linear paths in any direction including through branched microstructures, they can be separated according to their dielectric properties and retained without contact. Applications are in the fields of biotechnology and molecular separation, focussing and microtransport technology.

REFERENCES:
patent: 4569741 (1986-02-01), Pohl
Senichi Masuda et al "Movement of Blood Cells in Liquid by Nonuniform Traing Field" IEEE Transactions on Industrial Applications. vol. 24, No. 2 (Mar./Apr. 1988) 217-222.
Senichi Masuda et al "Separation of small particles suspended in liquid by non-uniform travelling field produced by three phase electric curtain device" presented at 1955 IEEE-IAS Anu. Meeting, Toronto, ON, Canada, Oct. 6-11.
Masuda et al., "Movement of Blood Cells in Liquid by Nonuniform Traveling Field", IEEE Transactions in Industry Applications, vol. 24, No. 2, pp. 217-222, Mar./Apr. 1988.
Masuda et al., "Separation of Small Particles Suspended in Liquid by Non-Uniform Traveling Field Produced by Three Phase Electric Curtain Device", presented at 1985 IEEE-IAS Ann. Meeting, Toronto Ontario, Canada, Oct. 6-11.
Fuhr et al., "Radio-Frequency Microtools for Particle and Live Cell Manipulation", Naturwissenschaften 81, pp. 528-535, 1994.

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