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Project leader: Prof. Dr. W. Maus-Friedrichs, Prof. Dr. A. Weber
Funding period: 07/2014 - 06/2017
Funding body: DFG
Funding code: MA 1893/23-1 & WE 2331/18-1
Researcher: Dr. Sebastian Dahle, MSc. Patrick Post
Laboratory rooms: 0.5 ; 321 (CZM), 410N (IEPT)
Nanoparticles of TiO2 are used in many different areas, such as in sunscreen creams, in wastewater treatment or in self-cleaning coatings. Many of the applications of TiO2 require a coating of these particles, e.g. for technical or medical reasons. The coating of TiO2 particles with SiO2 is technically relevant for these reasons. The introduction of the coating precursor into the process chain is not trivial and usually requires high temperatures. The processes involved in coatings of this type have not yet been systematically investigated.
In this project, TiO2 nanoparticles are to be coated with SiO2 shells of adjustable thickness in a two-stage entrained flow reactor using reactive cold plasmas (Dielectric Barrier Discharge-DBD). In addition to the promising technical feasibility, this process allows fundamental investigations of the processes and reactions in each of the individual process steps. To date, hardly any studies have been carried out on the coating of nanoparticles in entrained-flow reactors using DBDs. We combine the existing very sophisticated surface analytical methods with the continuous processes in the reactor. The aim of the project is to elucidate the fundamental mechanisms of interface and layer formation and their feedback on the production in the entrained-flow reactor.