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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.
Bundles of nanotubes agglomerated on a filter fiber.
Some nanotubes on a filter fiber.
By dispersion, the probability of a deposit of nanoparticles or nano-objects on a filter fiber is very high. There is also a tendency of particles to agglomerate on the filter: bundles of nanotubes are formed, which concentrates deposits locally.