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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.67: Poster
Thursday, April 3, 2014, 15:00–19:00, P2
Response of gold nanorods in solution to external electric fields — •Christina Lederle1, Daniel Scheid2, Markus Gallei2, and Bernd Stühn1 — 1Experimental Condensed Matter Physics, TU Darmstadt, Germany — 2Ernst-Berl Institut für makromolekulare Chemie, TU Darmstadt, Germany
We study gold nanorods of defined length (60 nm) and diameter (20 nm) in different solvents. The nanorods are coated by a block copolymer layer (Polyisoprene-b-Polypropylensulfid) which enhances the miscibility of the rods in organic solvents (tetrahydrofuran, chloroform, hexane, toluene). We apply an external AC electric field up to 1000 V/mm while performing dynamic light scattering experiments (DLS) to yield in collective diffusion coefficients, relaxation times and stretching parameters. These parameters show a strong correlation with the strength of the electric field in solutions of gold nanorods in THF and chloroform. This is due to a strong dielectric response of the respective solvent which causes the nanorods to accelerate their diffusive dynamics. This effect is absent when hexane or toluene is used as solvent.
We present a detailed analysis of the dependency of the dynamical parameters on the applied electric field. The orientation of the gold nanorods depending on the electric field is investigated by small angle X-Ray scattering.