Tong Zhang1, Hideaki Takahashi1, Mitsuhiko Hata2, Akira Toriba3, Takuji Ikeda4, Yoshio Otani2, Masami Furuuchi 2

  • 1 Graduate School of Natural Science & Technology, Kanazawa University, Kanazawa, 920-1192, Japan
  • 2 College of Science and Engineering, Kanazawa University, Kanazawa, 920-1192, Japan
  • 3 College of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-1192, Japan
  • 4 NITTA CORPORATION, Osaka, 556-0022, Japan

Received: July 20, 2016
Revised: July 20, 2016
Accepted: August 22, 2016
Download Citation: ||  

  • Download: PDF

Cite this article:
Zhang, T., Takahashi, H., Hata, M., Toriba, A., Ikeda, T., Otani, Y. and Furuuchi, M. (2017). Development of a Sharp-Cut Inertial Filter Combined with an Impactor. Aerosol Air Qual. Res. 17: 644-652.


  • A sharp-cut aerosol nanoparticle classifier has been developed and tested.
  • The technology is a layered mesh inertial filter combined with an impactor.
  • The hybrid inertial filter had sharper classification with less pressure drop.



A layered mesh inertial filter that was previously developed by the authors, was combined with an impactor, in which the collection efficiency curve overlaps that of the inertial filter, in order to provide a sharp-cut separation tool for aerosol nanoparticles operating at a moderate pressure drop of less than 10–15 kPa. The separation performance of the proposed “hybrid inertial filter” of the inertial filter and an impactor, such as cut-off size, steepness of the collection efficiency curve and pressure drop ΔP, was evaluated for a single nozzle type in order to confirm the proposed system. The performance of the single nozzle type, which can be used as a unit of a multi nozzle type, was compared with that of the previous type layered mesh inertial filter with a stainless steel fiber mat. The hybrid inertial filter was found to have a collection efficiency curve with a much better steepness at less ΔP compared to those of the previous type for particles with the same cut-off size: a cut-off size dp50 of 100 nm with steepness dp84/dp16 = 1.7, e.g., was obtained at ΔP ~12 kPa while dp84/dp16 = 2.4 at ~16 kPa was found for the previous type.

Keywords: Nanoparticle measurement; Impactors; Filtration; Samplers; Ambient; Classification

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

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal, promotes submissions of high-quality research, and strives to be one of the leading aerosol and air quality open-access journals in the world.