Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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Distortion of Eelectrical Double Layer in Liquid Filtration by Fibrous Filters

  • Lee, Myong-Hwa (Thermochemical Energy System R&BD Group, Korea Institute of Industrial Technology) ;
  • Hirose, Shogo (Particle Processing Laboratory, Graduate School of Natural Science and Technology, Kanazawa University) ;
  • Otani, Yoshio (Particle Processing Laboratory, Graduate School of Natural Science and Technology, Kanazawa University)
  • Received : 2014.08.19
  • Accepted : 2014.09.19
  • Published : 2014.09.30
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Abstract

Liquid filtration by membrane filters is essential for the preparation of ultrapure water in semiconductor manufacturing processes. The separation of submicrometer particles suspended in ultrapure water with a laminated fibrous membrane filter was studied numerically and experimentally in the present work. We found that an electrical double layer around a single fiber expanded to a large extent at a low ion concentration, as in ultrapure water, and deformed toward the upstream of the fiber with increasing filtration velocity. Since an increase in the electrical double-layer thickness leads to a decrease in the electrical potential gradient, particles with the same polarity as the fiber approach the fiber more easily and are captured at a high filtration velocity. Experimental results also confirmed that the collection efficiency of polystyrene latex(PSL) particles through a PTFE filter became higher as the filtration velocity increased.

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References

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