Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Diffusion and Dynamics

CPP 25.5: Vortrag

Mittwoch, 25. März 2009, 16:30–16:45, ZEU 160

Diffusion of magnetic nickel nanorods in colloidal dispersions — •Annegret Günther, Andreas Michels, Andreas Tschöpe, and Rainer Birringer — Technische Physik, Universität des Saarlandes, Postfach 151150, Geb. D2 2, D-66041 Saarbrücken, Germany

Ni nanorods with varying aspect ratios were synthesized by electrodeposition of Ni into porous alumina templates. The nanorods were extracted from the matrix by dissolution of the alumina and were dispersed in water or water-glycerine mixtures. The dynamics of the rods in colloidal dispersions in terms of the rotational and translational diffusion was investigated. Rotational diffusion of the nanorods was characterized by AC susceptibility measurements from 10 to 10000 Hz and by optical transmission measurements. The translational diffusion was studied by single particle tracking (SPT) of trajectories which were observed by laser scattering in an optical microscope. The rotational and translational diffusion coefficients were analyzed with regard to the aspect ratio of the Ni nanorods.