In situ charge characterization of TiO 2 and Cu-TiO 2 nanoparticles in a flame aerosol reactor

Manoranjan Sahu, Jinho Park, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Charge distribution characteristics were investigated for nanoparticles synthesized in a diffusion flame aerosol reactor. The nanoparticles considered were pristine TiO 2 and Cu-TiO 2, with Cu dopant concentrations ranging from 1 to 5 wt% with particle size from 25 to 60 nm. In situ measurements were conducted by integrating a tandem differential mobility analyzer (TDMA) experimental setup with the flame aerosol reactor. A charging model was used to identify the important parameters that govern the two charging mechanisms (diffusion and thermo-ionization) in the flame and their relative importance at different operating parameters. The results indicate that TiO 2 and Cu-TiO 2 nanoparticles carry single as well as double unit charges. The charged fraction depends on particle size as well as on dopant concentration. The charged fraction increased with increasing particle size and decreased with copper dopant concentration. Measured charged fractions were similar for both the polarities at different mobility diameters. Based on the flame operating parameters, the calculations indicate that diffusion charging is dominant in the flame, which is consistent with the experimental results.

Original languageEnglish (US)
Article number678
JournalJournal of Nanoparticle Research
Issue number2
StatePublished - Feb 2012
Externally publishedYes


  • Charge distribution
  • Cu-TiO
  • Dopant
  • Flame synthesis
  • Instrumentation
  • Nanoparticles
  • TiO

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics


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