Soft X-ray charger (SXC) system for use with electrospray for mobility measurement of bioaerosols

Luis B. Modesto-Lopez, Eric M. Kettleson, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Electrospray size spectrometry analysis (ESSA), a mobility-based aerosol technique to characterize the size and charge-state of nanoparticles, uses a neutralizer to bring multiply charged particles to an equilibrium charge-state. Typical ESSA setups incorporate a Po-210 neutralizer that has short half-life time and its radioactive nature leads to safety concerns. This work demonstrates that a soft X-ray charger (SXC) effectively neutralizes electrosprayed bioparticles. Calculations show that the SXC generates bipolar ions with number concentrations one and two orders of magnitude higher than conventional Po-210 and Kr-85 sources, respectively. Additionally, we established that an SXC may be safely implemented in ESSA.

Original languageEnglish (US)
Pages (from-to)357-364
Number of pages8
JournalJournal of Electrostatics
Issue number4
StatePublished - Aug 2011
Externally publishedYes


  • Electrospray
  • Photoionization
  • Proteins
  • Size spectrometry analysis
  • Soft X-ray charger
  • Viruses

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering


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