Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure and precursor loading

Hong Zhao, Stephen D. Tse

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The synthesis of nanoparticles (e.g. TiO2) is investigated experimentally and computationally in low-pressure H2/O2/N2 burner-stabilized flat flames in a stagnation point geometry, using a metal-organic (e.g. titanium tetra-iso-propoxide, TTIP) precursor. The flow field is modeled with detailed chemical kinetics and transport, and is compared with measurements using laser induced fluorescence (LIF) to map gas-phase temperature and OH-radical concentration. A sectional model, coupled with the simulated flow field and flame structure, is employed to model particle growth dynamics, computing aggregate particle size distribution, geometric standard deviation, and average primary particle size. The computations are compared with the experiments, for which in-situ characterization of the nanoparticles in the flow field is facilitated by a low-pressure aerosol sampling system connected to a nano scanning mobility particle sizer (nano-SMPS). Effects of operating pressures and precursor-loading rates on particle growth are also examined. Higher pressures produce larger aggregate particles, but with smaller primary particles, due to longer residence times. Higher precursor-loading rates result in larger aggregate particles, with slightly smaller primary particles.

Original languageEnglish (US)
Title of host publication5th US Combustion Meeting 2007
PublisherCombustion Institute
Pages422-439
Number of pages18
ISBN (Electronic)9781604238112
Publication statusPublished - Jan 1 2007
Event5th US Combustion Meeting 2007 - San Diego, United States
Duration: Mar 25 2007Mar 28 2007

Publication series

Name5th US Combustion Meeting 2007
Volume1

Other

Other5th US Combustion Meeting 2007
CountryUnited States
CitySan Diego
Period3/25/073/28/07

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

Cite this

Zhao, H., & Tse, S. D. (2007). Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure and precursor loading. In 5th US Combustion Meeting 2007 (pp. 422-439). (5th US Combustion Meeting 2007; Vol. 1). Combustion Institute.