Fig. 1. FT-IR spectra of sodium silicate based silica aerogels: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).
Fig. 2. Contact angle measurement of sodium silicate based silica aerogels: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/ Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).
Fig. 3. Pore size distributions of samples prepared by adding a various quantity of acetonitrile: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).
Fig. 4. N2 absorption-desorption isotherms of samples prepared by adding a various quantity of acetonitrile: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 acetonitrile/Na2SiO3 = 0.2).
Fig. 5. SEM images of samples prepared by adding a various quantity of acetonitrile: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).
Table 1. Pore-structural properties of different silica aerogels: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).
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