Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Magnetic Particles and Clusters

MA 18.1: Talk

Monday, March 16, 2020, 16:45–17:00, HSZ 403

Shape controlled synthesis of magnetite nanoparticles — •Ilona Wimmer¹, Bastian Welte², Sebastian Polarz², and Mikhail Fonin¹ — ¹Department of Physics, University Konstanz, D-78457 Konstanz — ²Department of Chemistry, University Konstanz, D-78457 Konstanz

Magnetic nanoparticles show a variety of unique properties such as superparamagnetism, magnetic single domain states, enhanced magnetic moments and magnetic anisotropies. These phenomena are not found in their bulk counterparts and make magnetic nanoparticles highly interesting for many applications ranging from medicine to data storage.

Here we report the synthesis of magnetite (Fe₃O₄) nanoparticles of different shapes, like spheres, hexagons and rods. The particles’ crystallographic structure was characterized by means of x-ray diffraction and transmission electron microscopy confirming the phase purity and providing information about particles’ shape and size. The rod-like particle shape exhibits a broad size distribution. Therefore, a special centrifugation protocol was introduced and several assembly techniques like drying-mediated self-assembly or external field directed self-assembly were used to achieve the ordered assembly of the particles. Further, we performed magnetic measurements revealing a superparamagnetic behavior with a blocking temperature of 145 K.