A Novel Environmental Route to Ambient Pressure Dried Thermal Insulating Silica Aerogel via Recycled Coal Gangue

Table 4

Physical properties of the silica aerogel.

(g cm^−3)	0.19 ± 0.05
(g cm^−3)	2.21 ± 0.02
%	91.4%
(m^2 g^−1)	690
(cm^3 g^−1)	4.81
(nm)	27.5