Synthesis and Characterization of Carbon Aerogel by Freeze-Drying Method

Abstract:

The carbon aerogels (CA) with different precursor concentration ratios were successfully prepared using the sol-gel method and vacuum freeze-drying technique, using formaldehyde and resorcinol as precursor materials. The crystal structure of the samples was analyzed by X-ray diffraction (XRD), the microstructure was characterized by scanning electron microscopy (SEM), the specific surface area was measured by Bruner-Emmett-Teller (BET) and the pore volume and pore size distribution of the sample was analyzed by Barrett-Joyner-Halenda (BJH). The results show that the microstructure of carbon aerogel is mainly microporous and mesoporous with a loose network pore structure. The microstructure and morphology of carbon aerogel changed significantly with the increase in precursor concentration. When the precursor concentration reaches 10 wt. %, the mesoporous microstructure of carbon aerogel is the best, the specific surface area reaches 970.51 m²/g, and a mesoporous material with good gel skeleton strength and toughness is formed.

• Periodical: Materials Science Forum (Volume 1167)
• Pages: 105-113
• DOI: https://doi.org/10.4028/p-geJ4mH
• Online since: November 2025
• Authors: Jia Yu Li, Ta Na Bao*, Yuan Yuan Li, Altan Bolag, Xiao Tian, Tegus Ojiyed
• Keywords: Carbon Aerogel, Mesoporous Structure, Vacuum Freeze-Drying Technology

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