A direct foaming approach for carbon nanotube aerogels with ultra-low thermal conductivity and high mechanical stability

A CNT aerogel exhibits an ultra-low density (4.6 mg cm −3 ), high porosity (99.6%), high specific surface area (463 m 2 g −1 ), and low thermal conductivity (16.5 mW m −1 K −1 ), as well as excellent fire-retardance and mechanical stability.