Nanoparticles/Nanoparticle’s Synthesis

Various approaches can be applied to prepare a huge number of different kinds of nanoparticles. The work at the DTNW focuses on the wet-chemical approaches to synthesise different nanoparticles and nano-structured materials. Following the wet-chemical approach several interesting materials can be prepared such as zinc oxide or titania (rutile) that can be employed for the preparation of layers protecting against ultraviolet radiation, iron oxide nanoparticles that exhibit so called super-paramagnetic properties, silver nanoparticles acting highly antibacterial or certain variations of zinc, or titanium dioxide showing a photo-catalytic effect which can be used to prepare self-cleaning surfaces. Apart from this, nanoparticles without certain functionality could e.g. be employed to create structures on a nano to submicron length scale which is of interest not only for influencing surface wetting.

The wet-chemical approach for preparation of such particles, e.g., by the sol-gel-approach, is of interest for several reasons. By appropriate synthesis dispersions of nanoparticles can be prepared that are stable for a long time, since the wet-chemical approach allows to limit or in best case avoid agglomeration of the primary particles. Particles prepared this way can be added, e.g. to different binder systems by simple mixing procedure which makes extensive dispersing processes unnecessary. Besides this, particles can be functionalised directly in the dispersions, e.g. to improve dispersabilty of dried powders or to increase compatibility with organic polymers for the preparation of composites.