Structure of carbon aerogels near the gelation limit of the resorcinol–formaldehyde precursor
- Petričević, R.
- Reichenauer, G.
- Bock, V.
- Emmerling, A.
- Fricke, J.
DOIAbstract
Resorcinol–formaldehyde (RF) gels with a very high molar ratio of resorcinol/catalyst (R/C), e.g., 1500 and a low relative molar mass content of resorcinol+formaldehyde (RF-ratio) of about 30% can be ambient pressure dried with minimal shrinkage. The resulting RF-aerogels exhibit average cluster and pore sizes >50 nm. Upon pyrolysis the RF-aerogels are transformed into carbon aerogels exhibiting the same morphology of the gel network but in addition showing a high amount of microporosity (<2 nm). Below an RF-ratio of thirty mass percent the average particle and pore size increase to several hundred nanometers. The macro- and microscopic properties of these aerogels were investigated by scanning electron microscopy, permeability measurements...
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