Air Purification Technology by Means of Cluster Ions Generated by Plasma Discharge at Atmospheric Pressure

  • Kazuo Nishikawa
  • Matthew Cook


The increased density of our living environment coupled with pollution of the atmosphere has led to a growing need for the removal of harmful molecules in the air (1). As a result research into applying a plasma discharge into the atmosphere and creating ozone and radicals of strong chemical reactivity to purify the air environment has gathered momentum. The removal of airborne particles, such as bacteria, allow for an improvement in indoor air quality so that our environment is healthy and pleasant. Within the medical field, illnesses caused by viruses such as influenza and SARS (2), hospital infections caused by airborne bacteria, fungi and allergic bronchial tube asthma (3), Japanese cedar hay fever caused by inhaling cedar pollen (4) are becoming large social concerns. In this research article, we discuss how we have applied our novel plasma discharge technology to produce positive and negative “cluster” ions. This iongenerating device operates at a normal atmospheric pressure. Subsequent investigations have permitted characterization of the resultant cluster ions. We have performed a series of experiments to prove the air purification effects of cluster ions, paying close attention to airborne harmful microbes and cedar pollen allergens.


Japanese Cedar Airborne Bacterium Crude Antigen Cedar Pollen Allergy Sufferer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    Tetsuji Oda et al. (2000) The future of Technologies on Environmental Measures by Discharge. Japan Society of Applied Physics 69:263–289Google Scholar
  2. 2.
    Bunshichi Shimizu (1996) Understanding the Virus, Koudansha, pp 129–187Google Scholar
  3. 3.
    Yoichi Minamishima, Yasuo Mizukuchi, Hiroaki Nakayama (1987) Current Microbiology, NanzandoGoogle Scholar
  4. 4.
    Yozo Saito et al. (1994) The Science of Hay feverGoogle Scholar
  5. 5.
    Journal of The Japan Research Group of Electrical Discharges (1998) Discharge Handbook, Oum, pp 400–417Google Scholar
  6. 6.
    Shinichiro Kitagawa, Zenichiro Kawasaki, Kazuhiko Miura, Koichiro Domoto (1996) Study of Atmosphere Electricity, Published by Tokai University, pp 45–61Google Scholar
  7. 7.
    Tadashi Akiyama (1997) Clean Technology 8:54–58Google Scholar
  8. 8.
    Artmann et al. (2005) Bactericidal effects of plasma-generated cluster ions. Med Biol Eng Comput 43(6):800–807CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Kazuo Nishikawa
    • 1
  • Matthew Cook
    • 1
  1. 1.Appliance Systems Product Development CenterSharp CorporationOsakaJapan

Personalised recommendations