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One-pot synthesis, characterization and properties of acidcatalyzed resorcinol/formaldehyde cross-linked silica aerogels and their conversion to hierarchical porous carbon monoliths

Journal of Sol-Gel Science and Technology, ISSN: 0928-0707, Vol: 62, Issue: 3, Page: 294-303
2012
  • 36
    Citations
  • 0
    Usage
  • 31
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    36
    • Citation Indexes
      35
    • Policy Citations
      1
      • 1
  • Captures
    31

Article Description

A rapid and facile synthesis of resorcinol/ formaldehyde cross-linked silica (RF/SiO ) aerogels was carried out in one pot based on an acid-catalyzed route, instead of the previously reported base-catalyzed ones. The gelation time was reduced to several hours at room temperature while it took several days even under heating conditions in the base-catalyzed ones. The interpenetrating network of RF/SiO aerogels showed similar porous structures with those of silica aerogels or RF aerogels. Their thermal conductivity was as low as that of the typical glass wool materials. The mechanical properties are characterized by dynamic mechanical analysis and compression testing. At room temperature, the results of compression testing show that the compressive Young's modulus or ultimate failure strength of RF/SiO aerogel specimen is higher than that of native SiO aerogels with a similar density. The one-pot method improves the efficiency and reduces the cost of RF/SiO aerogels. The hierarchical porous carbon monoliths are also converted from carbonized RF/SiO aerogels by an additional HF treatment. Hence, they could be further explored as multifunctional candidate materials for thermal, mechanical, and electrochemical applications. © Springer Science+Business Media, LLC 2012.

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