The investigation of the adsorption character of carbon aerogels

The influence of pyrolysis temperature and density on the microstructure of carbon aerogels is studied by nitrogen adsorption analysis. Resorcinol-for maldehyde (RF) aerogel and carbon aerogels all give type II isotherms and h ysteresis loops of type A. Carbon aerogel pyrolized at 600 degrees C has th e largest specific surface area (SSA). The trend of pore size distribution of RF aerogel and its pyrolized derivatives is same. Carbon aerogels with l ow and high density have different pore size distribution, while carbon aer ogel with low density has greater SSA. (C) 1999 Acta Metallurgica Inc.