Figure 3: Mechanical properties of FIBER NFAs with various densities.
From: Ultralight nanofibre-assembled cellular aerogels with superelasticity and multifunctionality

(a) The relative modulus (defined as the measured Young’s modulus, E, divided by the Young’s modulus of the constituent solid, Es) of selected cellular materials at low relative densities. (b) A 20-cm3 FIBER NFA (ρ=0.12 mg cm−3) stands on the tip of dyed feathers. (c) Photographs demonstrate that the ultralight FIBER NFAs (ρ=0.12 mg cm−3) can even float on cold air.