NDLI: Nanoscale mixing during double-flame spray synthesis of heterostructured nanoparticles

Content Provider	Springer Nature Link
Author	Grossmann, H. K. Grieb, T. Meierhofer, F. Hodapp, M. J. riler, D. Gröhn, A. Meier, H. F. Fritsching, U. Wegner, K. Mädler, L.
Copyright Year	2015
Abstract	The combination of two nanoparticle-producing flame reactors to a double-flame (DF) spray pyrolysis process is an attractive method for the high-temperature gas-phase synthesis of multicompound materials and heterostructures. It allows separate control of particle growth in the individual flames up to the intersection or mixing point where the formation of heterostructures takes place. The effect of mixing of the aerosol streams on the process temperature and product characteristics is investigated based on the example of Pt on TiO$_{2}$. Temperatures were determined by Fourier-transform infrared spectroscopy and thermocouple measurements along with computational fluid dynamics, while the degree of mixing was investigated based on surface area, Pt-dispersion measurements, and transmission electron microscopy image analyses. The quadrat method in combination with the variation coefficient was used to quantify the uniformity of the Pt cluster distribution on the TiO$_{2}$ support. For high intersection distances of the two flame jets and small intersection angles, nonuniform mixing of the compounds and the formation of large Pt particles are observed. For small intersection distances and large angles, a uniform Pt distribution was achieved. Based on these findings, process design rules were established which can be transferred to other material systems.
Starting Page	1
Ending Page	16
Page Count	16
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	17
Issue Number	4
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-04-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Double-flame spray pyrolysis Multicompound material Degree of mixing Flame temperature profiles Computational fluid dynamics (CFD) Modeling and simulation Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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