Electrode arrangement for generating functional field barriers in microsystems

A microsystem adapted for dielectrophoretic manipulation of particles in a suspension liquid, said microsystem comprising:

• a channel with channel walls, said channel having a longitudinal extension in an x-direction and said channel walls comprising bottom and cover surfaces walls extending in the x-direction and an y-direction, and
• an electrode arrangement with at least one microelectrode on at least one of said bottom or cover surfaces walls for generating a field barrier which crosses the channel at least partly, wherein
• the at least one microelectrode comprises a multitude of straight electrode sections connected with each other, and—in relation to the longitudinal extension of said channel, said straight electrode sections are arranged with predetermined, different angles and the field barrier has a parabolic or hyperbolic curvature relative to the x- and y-directions corresponding to the arrangement of said straight electrode sections.