File:Filter collection mechanisms.png

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English: Figure 5. Four primary filter collection mechanisms:
  • Diffusion is the result of the random (Brownian) motion of a particle. The particle may contact a fiber on its path through the filter.
  • Interception occurs when the radius of a particle moving along an air streamline is greater than the distance from the streamline to the surface, thus causing the particle surface to contact the surface of the fiber. The particle adheres to the fiber due to intermolecular forces.
  • Inertial impaction occurs when an air stream bends around a fiber, and a particle traveling in that air stream continues in a straight path due to particle inertia. The particle collides with the fiber and adheres to it due to intermolecular forces.
  • Electrostatic attraction occurs when the particle and the fiber are oppositely charged. As the force of this attraction is governed by the charge-to-mass ratio of the particle, it becomes more effective as particle size decreases.
Date
Source Current Strategies for Engineering Controls in Nanomaterial Production and Downstream Handling Processes (in en-us). U.S. National Institute for Occupational Safety and Health pp. 14–15 (November 2013). Retrieved on 2017-03-05.
Author U.S. National Institute for Occupational Safety and Health
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