fig2

Figure 2. Characterization of aerogel film samples. (A) UV-vis spectra of 3 mm-thick aerogel films and 1 mm glass as a reference. The samples with the highest transmittance in each group are displayed. Inserts of (A) are the optical images of the samples; (B) Thermal conductivity of aerogel films; (C) Compressive stress-strain curves for the aerogel films. Insert of (C) are the compression diagrams; (D) UV-vis spectra for aerogel films after mechanical compression. Insert of (D) is an optical image of A2 after compression. UV-vis: Ultraviolet-visible.