Particle and Aerosol Research Vol. 10, No. 3, September 2014 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Distortion of Eelectrical Double Layer in Liquid Filtration by Fibrous Filters
À̸íÈ, Hiroso Shogo, Yoshio Otani
Abstracts
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.
File
2À̸íÈ(99-108).pdf
Download