Karl Franzens University Graz
Graz University of Technology
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Karl Franzens University Graz | Graz University of Technology | |
Magnetic nanoparticles in different media: effects and impact Magnetic-field-assisted self-assembly of magnetic dipole moment carrying iron nanoparticles is shown to result in the formation of nanoscale rods. The cooperative behaviour of those rods exhibits self-organized pattern formation on different length scales in presence of magnetic fields. Pattern formation on large length scales reveals great similarity with physical systems undergoing spinodal decomposition. We also discuss a synthesis-route allowing to prepare ferrofluids (FF) with shape-anisotropic particles. These so-called nanorod FF have interesting rheological properties; particularly, we will focus on their magnetoviscous properties, which may have prospects for applications in microfluidics and MEMS. The incorporation of hard- magnetic nano-objects in a gel matrix, so-called ferrogels, render this materials sensitive to externally applied magnetic fields. We discuss translational, rotational and torsional degrees of freedom of movement of ferrogels stimulated by external field application. |