Tannin-based carbon foams

An easily-prepared self-blowing system based on low-cost precursors, mainly tannin and furfuryl alcohol, was pyrolysed at 900 °C. Extremely low-density glass-like carbon foam was obtained, with very high porosity (96.4%, of which 94% is open) and low surface area (below 1 m2 g−1). The material presents slightly anisotropic properties. The linear cell density is 100 and 190 ppi along two orthogonal directions, and the major physical properties...