N95 masks have many smart methods for filtering airborne particles. The most impressive method is the electrostatic charging of N95 masks, which is a significant contributor to their filtration performance, increasing it at least 10-fold over the uncharged fabric.
An electret (formed of electr- from “electricity” and -et from “magnet”) is a dielectric material that has a quasi-permanent electric charge or dipole polarisation. An electret generates internal and external electric fields and is the electrostatic equivalent of a permanent magnet.
The name originates from “electron” and “magnet”; drawing an analogy to the development of a magnet by the alignment of magnetic fields in a piece of iron. [source]