Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 32: Magnetic Particles / Clusters

MA 32.11: Vortrag

Donnerstag, 30. März 2006, 17:45–18:00, HSZ 401

Synthesis of magnetic nanoparticles with pronounced shape anisotropy and characterization via small angle X-ray scattering (SAXS) — •Frank Döbrich, Andreas Michels, Andreas Tschöpe, and Rainer Birringer — Universität des Saarlandes, Technische Physik, Geb. D2 2, 66041 Saarbrücken, Germany

Ferrofluids (FF) are stable colloidal suspensions of magnetic particles in a nonmagnetic carrier fluid. This fact renders a FF sensitive to an external magnetic field, which leads to a coupling of magnetic and rheological properties. For instance, it is expected that a dispersion of highly anisometric particles such as rods or chains reveals a large enhancement (compared to spherical particles) of the magnetoviscous effect, i.e. the increase of the FF’s viscosity due to an externally applied magnetic field. This contribution reports on the synthesis of a highly anisometric FF containing stable chains of iron nanoparticles and on the microstructural characterization by means of transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). The SAXS measurements develop a pronounced anisotropy of the scattering pattern as a function of increasing external magnetic field. Evaluation of the radially averaged SAXS curves in terms of basic scattering functions is discussed.