Abstract
Structure and density of organic RF (resorcinol formaldehyde) aerogels and pyrolized RF aerogels (carbon aerogels) can be modified upon variation of the resorcinol to catalyst (RC) ratio and by varying the mass ratio of the reactants resorcinol and formaldehyde in the sol. Here, series of RF and carbon aerogels have been produced with RC 200, 500 and 1500, each covering a wide density range. All samples were investigated using small angle X-ray scattering (SAXS), N 2 and CO 2 adsorption. The creation of a huge amount of microporosity due to pyrolysis was observed and investigated by CO 2 adsorption. SAXS scattering curves exhibit interesting structural changes. These investigation were accompanied by sound velocity measurements to obtain the elastic modulus.
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