Spatially resolved flame zone classification of a flame spray nanoparticle synthesis process by combining different optical techniques

Journal article


Publication Details

Author(s): Kilian D, Engel S, Borsdorf B, Gao Y, Kögler A, Kobler S, Seeger T, Will S, Leipertz A, Peukert W
Journal: Journal of Aerosol Science
Publisher: Elsevier
Publication year: 2014
Volume: 69
Pages range: 82--97
ISSN: 0021-8502
Language: English


Abstract


Flame spray synthesis of silica nanoparticles is characterized by a set of complementary optical techniques. By means of laser-sheet based Mie scattering imaging, 2D-chemiluminescence imaging and coherent anti-Stokes Raman spectroscopy (CARS) local information on spatial droplet distribution, combustion zone, nucleation zone and temperature in the flame could be obtained. In addition, the outcomes from optical metrology are validated by thermophoretic sampling at different flame heights and the synthesized powders were analyzed by N2 gas sorption. By comparing these results the flame can be quantitatively classified into three distinct zones: (i) the droplet zone where precursor atomization and evaporation take place, (ii) the nucleation zone indicated by SiO*/Si* radicals as a preliminary species before SiO2 particle formation and (iii) the sintering zone characterized by the highest temperatures in flame. In addition the spatial spreading of the nucleation zone as a function of precursor concentration is investigated. Theoretical calculations and experimental results show an extended nucleation regime for the lowest precursor concentration compared to higher concentrations. Although this study is performed with hexamethyldisiloxane (HMDS) precursor to synthesize silica nanoparticles as a model system, dimensionless analysis shows that the results, concerning the spray formation, can be transferred to the synthesis of other materials as well.



FAU Authors / FAU Editors

Engel, Sascha
Peukert, Wolfgang Prof. Dr.-Ing.
Lehrstuhl für Technische Thermodynamik
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Lehrstuhl für Technische Thermodynamik
Gao, Yi
Lehrstuhl für Technische Thermodynamik
Kilian, Daniel
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Kögler, Andreas
Lehrstuhl für Prozessmaschinen und Anlagentechnik
Leipertz, Alfred Prof. Dr.-Ing.
Lehrstuhl für Technische Thermodynamik
Seeger, Thomas Prof. Dr.-Ing.
Lehrstuhl für Technische Thermodynamik
Will, Stefan Prof. Dr.-Ing.


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


Research Fields

A1 Functional Particle Systems
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Kilian, D., Engel, S., Borsdorf, B., Gao, Y., Kögler, A., Kobler, S.,... Peukert, W. (2014). Spatially resolved flame zone classification of a flame spray nanoparticle synthesis process by combining different optical techniques. Journal of Aerosol Science, 69, 82--97. https://dx.doi.org/10.1016/j.jaerosci.2013.12.002

MLA:
Kilian, Daniel, et al. "Spatially resolved flame zone classification of a flame spray nanoparticle synthesis process by combining different optical techniques." Journal of Aerosol Science 69 (2014): 82--97.

BibTeX: 

Last updated on 2018-10-08 at 01:27