Kolloquimsvortrag: Dr. Karsten Wegner, ETH Zurich / 20.04.2015

20.04.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium

Titel: Flame Manufacture of ZnO and other Metal Oxide Nanoparticles



Flame spray pyrolysis has evolved into an extremely versatile process for production of single and multicomponent oxide nanoparticles of almost all periodic table elements. Material development has been carried out mostly with laboratory reactors at g/h scale, now requiring transfer into an industrial production environment. Successful process scale-up to kg/h output has been achieved for instance for zirconia or iron phosphate whereas the transfer remained challenging for zinc oxide nanoparticles.
This prompted us to investigate flame synthesis of ZnO in more detail. Formation and growth of spherical and rod-like structures was tracked by sampling nanoparticles thermophoretically in-situ the reactor and analyzing their morphology by electron microscopy. Along with temperature measurements and process simulations, conditions for production of sphere-like particles and nanorods could be developed. Characterization of the surface chemistry revealed shape-dependent differences that could affect the performance of the powders in catalytic hydrogen production, one envisioned application.

Prof. Adelung

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