Lin Li, Da-Ren Chen

  • Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, One Brookings Drive, Box 1180, St. Louis, Missouri 63130, U.S.A.

Received: July 21, 2011
Revised: October 11, 2011
Accepted: October 11, 2011
Download Citation: ||  

  • Download: PDF

Cite this article:
Li, L. and Chen, D.R. (2011). Aerosol Charging Using Pen-Type UV Lamps. Aerosol Air Qual. Res. 11: 791-801.



A portable aerosol charger utilizing pen-type Hg lamps was constructed to investigate the particle charging process under UV irradiation. The charger primarily consisted of a quartz tube surrounded by four pen-type low-pressure Hg lamps and an ion trap located downstream of the quartz tube to remove excessive ions. The performance of the prototype UV charger at 5 L/min flow rate and with four UV lamps turned on using monodisperse silver (Ag) particles with diameters ranging from 7 to 30 nm was evaluated. As expected, the prototype UV charger provided higher particle charging efficiencies than corona-based unipolar chargers for Ag particles. To evaluate the effect of irradiation intensity on particle photocharging, the charging efficiencies and charge distributions for Ag particles ranged from 7 to 30 nm when the prototype was operated at an aerosol flow rate of 5 L/min for the cases of one, two, and four lamps turned on. The UV charging model with the photoemission based on the Fowler-Nordheim law was further applied to predict the charging performance of the UV charger at different operational conditions.

Keywords: Nanoparticle charging; UV charger; UV irradiation intensity

Don't forget to share this article 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

Latest coronavirus research from Aerosol and Air Quality Research

2018 Impact Factor: 2.735

5-Year Impact Factor: 2.827

SCImago Journal & Country Rank