Abstract
Carbon aerogel was obtained by pyrolysis of organic aerogel by ambient pressure drying technique. The effect of pyrolysis conditions on characteristics of carbon aerogel such as density, specific surface area and conductivity was studied. The properties and structure of carbon aerogel samples were investigated by nitrogen adsorption, four-point probe method and XRD diffraction. The results showed that carbon aerogel had structure between amorphous and graphite state. The highest specific surface area was 800 m2/g at pyrolysis temperature of 700oC. The pore-size was distributed in microporous, with the maximum total pore volume of 0.44 cm3/g. The electrical conductivity of carbon aerogel was highest at pyrolysis temperature of 800-900oC with the value in the range of 1.744-1.923 S/cm.
Highlights
Carbon aerogels were very interesting monolithic materials with a large of potential applications because of their versatile properties, such as low density, high surface area, high porosity, low electrical resistivity and controllable structure characteristics [1, 2]
Carbon aerogels obtained by using different catalysts showed Brunauer– Emmett–Teller (BET) surface area, average pore size, total pore volumes in the range of 438-496 m2/g, 17.9-22.4 Å and 0.20-0.27 cm3/g, respectively
Higher pyrolysis temperature tended to increase the mass loss of carbon aerogel
Summary
Carbon aerogels were very interesting monolithic materials with a large of potential applications because of their versatile properties, such as low density, high surface area, high porosity, low electrical resistivity and controllable structure characteristics [1, 2]. Al‐Muhtaseb and Ritter [3] synthesized carbon aerogel from resorcinol– formaldehyde organic aerogel at different drying conditions. The experiments data showed that properties of carbon aerogel were affected of many factors such as the catalyst concentration, the initial gel pH, the concentration of solids in the sol, the drying method and the conditions of pyrolysis and activation. Carbon aerogels obtained by using different catalysts showed BET surface area, average pore size, total pore volumes in the range of 438-496 m2/g, 17.9-22.4 Å and 0.20-0.27 cm3/g, respectively. Carbon aerogel was synthesized from polyureas, melamine– formaldehyde and polyurethanes. Among these materials, the resorcinol–formaldehyde system was the most frequently studied and the reaction parameters were the most well understood [5]
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