Inter- and Intra-Primary-Particle Structure of Monolithic Carbon Aerogels Obtained with Varying Solvents
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- 作者：D. Fairé ; n-Jimé ; nez ; F. Carrasco-Marí ; n ; C. Moreno-Castilla
- 刊名：Langmuir
- 出版年：2008
- 出版时间：March 18, 2008
- 年：2008
- 卷：24
- 期：6
- 页码：2820 - 2825
- 全文大小：590K
- 年卷期：v.24,no.6(March 18, 2008)
- ISSN：1520-5827
文摘
Different carbon aerogels were obtained by carbonization of organic aerogels prepared from the polymerizationof resorcinol and formaldehyde using potassium carbonate as catalyst. Various solvents were added to the initialmixture to study their effects on the inter- and intra-primary-particle structure of the carbon aerogels. To carry outthis study, various techniques were used, including high-resolution transmission and scanning electron microscopy,mercury porosimetry, mechanical tests, N2 and CO2 adsorption at -196 and 0 
ntities/deg.gif">C, respectively, and immersioncalorimetry into benzene. Variation of the solvent used produced changes in the gelation time of the organic aerogels,which gave rise to variations in the inter- and intra-primary-particle structure of the carbon aerogels obtained. Themonolith density of the carbon aerogels ranged from 0.37 to 0.87 g/cm3. Samples with a density higher than 0.61 g/cm3had micropores and mesopores but no macropores. Macro- and mesoporosity had a monomodal pore size distribution.The elastic modulus showed a scaling relationship with density. In all samples studied, which had a mean microporewidth of 0.62-1.06 nm, the surface area obtained by enthalpy of immersion into benzene yielded a realistic valueof their total surface area.
ntities/deg.gif">C, respectively, and immersioncalorimetry into benzene. Variation of the solvent used produced changes in the gelation time of the organic aerogels,which gave rise to variations in the inter- and intra-primary-particle structure of the carbon aerogels obtained. Themonolith density of the carbon aerogels ranged from 0.37 to 0.87 g/cm3. Samples with a density higher than 0.61 g/cm3had micropores and mesopores but no macropores. Macro- and mesoporosity had a monomodal pore size distribution.The elastic modulus showed a scaling relationship with density. In all samples studied, which had a mean microporewidth of 0.62-1.06 nm, the surface area obtained by enthalpy of immersion into benzene yielded a realistic valueof their total surface area.