Nanostrands provide a wide band of electromagnetic interference shielding protection. This is because of their unique combination of electrical dc conductivity and ferromagnetism, along with their complex nanostructured geometry that provides for a high surface area and multiple angles of reflection and absorption, due to their small diameter and complex curvatures of the interconnected nanostrands.
Even small amounts of nanostrands provide exceptional shielding. In the graph below, one test showed that a thin film of nanostrand veil (.004" at 20% volume nanostrands), shielded about 80 dB from 4 Ghz to 18 Ghz. In another test, a nanostrand paint loaded with 10% nanostrands shielded from 50 to 70 dB in the range of 30MHz to 1500 MHz.
The interesting characteristic of both of these tests is that the shielding efficiency actually improves as the frequency decreases.
Though there is only limited data so far, it appears that small amounts of nanostrands can provide metal-like shielding capability in a wide variety of formats, such as paints, veils, gaskets, and composites.
