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Filtering

How does a filter work?

The finest mesh filters have a size of the order of 100 nm. The particles size greater than 100 nm are blocked by inertia or interception. But nanoparticles are not taken up by a simple mechanical lock: their diffusion behavior allows catching them. In addition in the filters, the particles agglomerate easily.

How do particles interact with fibers?

223_piegeage_des_nanos

Filtering methods.

With "nano" dimensions, particles interact with fibers following two mechanisms:

  • trapping by diffusion: the random movements of air molecules make these very small particles (without inertia) roam through direct current lines until they come into contact with a fiber,
  • electrostatic attraction (non-specific to “nano”): the charged particles are attracted to fibers with an opposite charge. The electrostatic attraction is highly effective until saturation of filter or charge neutralization.