We report new polysiloxane and polycarbosilane aerogels, which have been obtained by crosslinking Si-H-containing polymers with a C]C-containing crosslinker via hydrosilylation reactions. The crosslinking reaction has been carried out in a highly diluted solution using up to 97 vol% of solvent. The obtained aerogels have a colloidal structure with meso-and macropores. Density as low as 0.17 g cm À3 has been reached, which implies a porosity of ca. 84 vol%.

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