Facile preparation of ZrCO composite aerogel with high specific surface area and low thermal conductivity

Sheng Cui, Hao Suo, Feng Jing, Shuwen Yu, Jun Xue, Xiaodong Shen, Benlan Lin, Shengjun Jiang, Yu Liu

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

A novel ZrCO composite aerogel is synthesized using zirconium oxychloride and resorcinol–formaldehyde (RF) as precursors through the sol–gel route and carbothermal reduction process. The effects of different Zr/R molar ratios and calcination temperatures on the physical chemistry properties of ZrCO aerogels are investigated. The ZrCO composite aerogel consists of the C/ZrO2/ZrC ternary aerogel. The results show that with the increase of R/Zr molar ratios, the specific surface area and bulk density increase with calcination temperature up to 1300 °C, but decrease at even temperature (1500 °C). The specific surface area is as high as 637.4 m2/g for ZrCO composite aerogel (R:Zr = 2:1), which was higher than ever reported. As the heat-treatment temperature increases to 1500 °C, the ZrC crystalline phase occurs and the t-ZrO2 phase still appears within the composite. The thermal conductivity of the carbon fiber mat-reinforced composite aerogel is as low as 0.057 W/m/K at room temperature (25 °C). [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)383-390
Number of pages8
JournalJournal of Sol-Gel Science and Technology
Volume86
Issue number2
DOIs
StatePublished - 1 May 2018

Keywords

  • Sol–gel
  • ZrCO aerogel
  • nanomaterials
  • specific surface area
  • thermal conductivity

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