Charging of particles in unipolar coronas irradiated by in-situ soft X-rays: Enhancement of capture efficiency of ultrafine particles

Pramod Kulkarni, Norikazu Namiki, Yoshio Otani, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The charging of fine particles in unipolar coronas irradiated by soft X-rays (3.5-9.5 keV,λ=0.13-0.41 nm) was studied. Voltage-current characteristics were used to examine the corona inception voltage in presence and absence of X-ray irradiation and to estimate the ion concentrations. The capture characteristics of synthesized particles: iron oxide, sodium chloride, silica and titanium dioxide, were established in coronas, with and without X-ray irradiation. Enhanced charging of ultrafine particles in coronas was observed in conjunction with soft X-ray irradiation. A positive corona with X-ray irradiation resulted in the highest charging efficiencies, followed by a negative corona with X-ray, X-ray only, negative corona only and finally positive corona only. Particle charging theories available in the literature were used to qualitatively explain the observed trends.

Original languageEnglish (US)
Pages (from-to)1279-1296
Number of pages18
JournalJournal of Aerosol Science
Volume33
Issue number9
DOIs
StatePublished - Sep 2002
Externally publishedYes

Keywords

  • Charging
  • Corona
  • ESP
  • Photoionization
  • Soft X-ray
  • Ultrafine particles

ASJC Scopus subject areas

  • Environmental Engineering
  • Pollution
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Atmospheric Science

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