PROJECT TITLE :

Tannin-Based Carbon Foams for Electromagnetic Applications

ABSTRACT:

Broadband dielectric analysis of tannin-based carbon foams made at 9 completely different densities, starting from zero.036 to zero.114 g/cm3, was carried out in wide frequency (twenty Hz-thirty five GHz) and temperature (25-five hundred K) ranges. Each dielectric constant and electrical conductivity of carbon foams in quasi-static regime, at 129 Hz, were high (more than 106 and shut to seventy S/m, respectively), and increased with carbon foams density consistent with power laws. Vital electromagnetic interference shielding efficiency (EMI SE) was found at microwave (MW) frequencies for all made samples. The best worth of electromagnetic attenuation at the level of 20 dB for 2-mm thick sample was observed for the foam having the very best density and also the lowest mean cell size. For thicker samples (4 mm and 1 cm), EMI SE reached 39 and 73 dB, respectively. On cooling, dc conductivity decreased with temperature according to Mott's law but foams still remained opaque to the MW radiation. MW performances of carbon foams reported here, together with different valuable properties like “inexperienced” origin, low price, lightness, chemical inertness, thermal stability and high conductivity, open new routes for producing effective EMI shields from tannin-based carbonaceous porous structures.


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