The large-scale structure of carbon nanofoam is similar to that of an aerogel, but with 1% of the density of previously-produced carbon aerogels—or only a few times the density of air at sea level. Unlike carbon aerogels, carbon nanofoam is a poor electrical conductor. The nanofoam contains numerous unpaired electrons, which Rode and colleagues propose is due to carbon atoms with only three bonds that are found at topological and bonding defects. This gives rise to what is perhaps carbon nanofoam's most unusual feature; it is attracted to magnets, and below −183 °C can itself be made magnetic. This property of ferromagnetism has also been seen in other allotropes of carbon including fullerene subjected to high pressures and temperatures and graphite irradiated with high energy protons.
BW Bewise Inc.
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