Effect of initial sol concentration on the microstructure and morphology of carbon aerogels

摘要: New carbon aerogels were prepared using Novolac sol as precursor. The elaboration process and the structural characterizations of these porous materials are described in present study. Series monolithic 2-propanol by crosslinking with hexamethylene tetra amine catalyst via sol–gel polymerization solvent vapor-saturated atmosphere followed pyrolysis. Low density (from 0.3 to 0.6 g/cm3) obtained after These newly characterized mercury porosimetry, nitrogen adsorption scanning electron microscopy. All have shown a nanostructured solid network (specific surface areas between 554 635 m2/g) all samples pore volumes large 0.97 cm3/g. Influence concentration initial on aerogel structure was investigated. A special attention dedicated different microstructures morphologies occurring process. In particular, changing from colloidal polymeric studied terms micro, meso macro porosity. parallel, mechanical properties presented bulk modulus.