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Analysis of micro-explosions in nanoparticle synthesis in spray flames


Spray flame synthesis is a process to produce metal oxide nanoparticles from the gas phase. For this purpose, a so-called precursor solution of a metal-containing material is atomized in a nozzle and fed into a combustion chamber. In the chamber, the spray ignites from contact with a hot pilot flame and nanoparticles of the oxide of the dissolved metal form.

In spray flame synthesis, many complex processes occur on short time and length scales. These processes are not yet well understood. Our project is dedicated to studying the evaporation of a droplet of precursor solution in the combustion chamber. This is a problem with coupled heat and mass transport with high gradients. Furthermore, micro-explosions of single droplets occur in many relevant material systems. These micro-explosions are key to a successful spray flame synthesis. The aim of the project is to clarify the causes of these micro-explosions. For this purpose, thermophysical property data of precursor solutions will be determined experimentally and models for the evaporation of a single droplet will be developed. These models allow for assessing different hypotheses on the causes of the micro-explosions.

The project is part of the DFG priority program 1980 "Nanoparticle Synthesis in Spray Flames: Measurement, Simulation, Processes". A collaboration with groups at the Universities of Bremen, Duisburg-Essen and Stuttgart is planned.


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Last Change: June 10th 2020