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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.4: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Research and cost-saving production of size-selected magnetic nanoparticles from toners — •Miriam Leifels, Paula Weber, and Mathias Getzlaff — Heinrich-Heine-Universität Düsseldorf

The investigation of laser printer toners proves that they often contain magnetic nanoparticles. The aim is to isolate them from the nonmagnetic ones as a cost-saving method for production. There are many constructive characterization methods like energy dispersive x-ray spectroscopy, dynamic light scattering, x-ray diffraction, scanning electron microscopy and transmission electron microscopy to analyze particles which are part of toners. Thus, we obtain information about the element composition, size and shape of the particles. It shows that all the toners which contain magnetic particles have a bimodal size distribution. It is possible to isolate the magnetic particles from the nonmagnetic ones. For that process we solve the toner powder in a suitable solvent. Subsequently, we use a little magnet to isolate all the magnetic particles out of solution. This enables to make measurements only with the magnetic particles and independently only with the nonmagnetic ones, exemplarily by dynamic light scattering. After separation we are able to measure the size of the magnetic particles and nonmagnetic particles separately. It shows that the magnetic particles have a different size as the nonmagnetic particles. One peak of the bimodal size distribution only represents magnetic and the other peak only nonmagnetic particles.