Nanoscale mixing during double-flame spray synthesis of heterostructured nanoparticles

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• 作者：H. K. Grossmann (1)
  T. Grieb (1)
  F. Meierhofer (1)
  M. J. Hodapp (1) (2)
  D. Noriler (2)
  A. Gr枚hn (3)
  H. F. Meier (2)
  U. Fritsching (1)
  K. Wegner (3)
  L. M盲dler (1)
  
  1. Foundation Institute of Materials Science (IWT) ; Department of Production Engineering ; University of Bremen ; Badgasteiner聽Strasse聽3 ; 28359 ; Bremen ; Germany
  2. Department of Chemical Engineering ; Regional University of Blumenau (FURB) ; S茫o Paulo St. ; 3250 ; Blumenau ; SC ; 89030鈥?00 ; Brazil
  3. Particle Technology Laboratory ; Institute of Process Engineering ; Department of Mechanical and Process Engineering ; Swiss Federal Institute of Technology (ETH) Z眉rich ; Sonneggstrasse聽3 ; 8092 ; Zurich ; Switzerland
  
• 关键词：Double ; flame spray pyrolysis ; Multicompound material ; Degree of mixing ; Flame temperature profiles ; Computational fluid dynamics (CFD) ; Modeling and simulation
• 刊名：Journal of Nanoparticle Research
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：17
• 期：4
• 全文大小：1,306 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nanotechnology
  Inorganic Chemistry
  Characterization and Evaluation Materials
  Physical Chemistry
  Applied Optics, Optoelectronics and Optical Devices
  
• 出版者：Springer Netherlands
• ISSN：1572-896X

文摘

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 TiO2. 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 TiO2 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.