title: Light-induced dielectrophoretic manipulation of DNA.
abstract: Light-induced dielectrophoretic movement of polystyrene beads and lambda-DNA is studied using thin films of amorphous hydrogenated silicon as local photoaddressable electrodes with a diameter of 4 microm. Positive (high-field seeking) dielectrophoretic movement is observed for both types of objects. The absence of strong negative (low-field seeking) dielectrophoresis of DNA at high frequencies is in agreement with the similarity of the dielectric constants of DNA and water, the real part of the dielectric function. The corresponding imaginary part of the dielectric function governed by the conductivity of DNA can be determined from a comparison of the frequency dependence of the dielectrophoretic drift velocity with the Clausius-Mossotti relation.
authors.affiliation: Walter Schottky Institut, Technische Universität München, Garching, Germany. hoeb@wsi.tum.de
authors.forename: Marco
authors.initials: M
authors.lastname: Hoeb
authors.forename: Joachim O
authors.initials: JO
authors.lastname: Rädler
authors.forename: Stefan
authors.initials: S
authors.lastname: Klein
authors.forename: Martin
authors.initials: M
authors.lastname: Stutzmann
authors.forename: Martin S
authors.initials: MS
authors.lastname: Brandt
mesh_terms: D004247:DNA / Q000737:chemistry / Q000302:isolation & purification* / Q000528:radiation effects*; D004553:Electric Conductivity; D004566:Electrodes; D004586:Electrophoresis; D007700:Kinetics; D008027:Light; D011137:Polystyrenes
chemical_list: D011137:Polystyrenes; D004247:DNA