Process for manipulating microscopic, dielectric particles and a device therefor

US6149789A · kind A · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Wolfgang Benecke · Kürten, DE
• Bernd Wagner · Looft, DE
• Gunter Fuhr · Berlin, DE
• Rolf Hagedorn · Berlin, DE
• Thorsten Müller · Friedrichshafen, DE

Key dates

• Filing date: Jul 27, 1995
• Grant date: Nov 21, 2000
• Expiry date: Jul 27, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00853
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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 technolo…