Mprovement of mesoporosity of carbon cryogels by ultrasonic irradiation

N. Tonanon, A. Siyasukh, W. Tanthapanichakoon, H. Nishihara, S. R. Mukai, H. Tamon

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Mesoporous carbon gels are usually obtained by pyrolyzing resorcinol-formaldehyde (RF) gels, which are synthesized via the sol-gel polycondensation of resorcinol with formaldehyde in a slightly basic aqueous solution followed by drying. However, mesoporous carbon gels cannot be prepared under the conditions of high catalyst concentration or high pH of RF solution even by using supercritical drying or freeze drying. In this work, mesoporosity of carbon cryogels is improved by ultrasonic irradiation to RF solution. It is found that the gelation time of RF solution becomes greatly short by ultrasonic irradiation and that ultrasonic can improve mesoporosity of carbon cryogels prepared at high catalyst concentration (C/W). Although the carbon cryogels prepared from C/W = 80mol/m3 have no mesopores, the carbon sonogels prepared by ultrasonic irradiation under the same catalyst condition have sharp mesopore size distribution. The utilization of ultrasonic in the preparation of RF gel is an interesting way in improving mesoporosity of carbon gels prepared at high C/W or pH.

Original languageEnglish
Pages (from-to)525-531
Number of pages7
JournalCarbon
Volume43
Issue number3
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • A. Porous carbon
  • B. Pyrolysis
  • C. Adsorption, Scanning electron microscopy
  • D. Porosity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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