Fabrication and characterization of the monolithic hydrophobic alumina aerogels

作者：Li, Xueai; He, He; Ren, Lili^*

来源：Journal of Porous Materials, 2017, 24(3): 679-683.

DOI：10.1007/s10934-016-0304-y

• Surface modification
• Hydrophobic Al2O3 aerogels
• Trimethylchlorosilane (TMCS)

The monolithic hydrophobic mesoporous alumina aerogels were successfully synthesized by acid-base sol-gel polymerization of aluminium chloride hexahydrate (AlCl3 center dot 6H(2)O) in deionized water/alcohol solution (v/v = 3:7). To minimize shrinkage during drying, alumina hydrogels were aged in tetraethylorthosilicate (TEOS)/acetonitrile solution, and modified using trimethylchlorosilane (TMCS)/acetonitrile solution. Properties of the final product were examined by contact angle measurement, FTIR, FESEM, TEM and BET analyses. Surface modification was confirmed by FTIR spectroscopy. It was found that hydrophobic property of the alumina aerogels was affected by the contents of TMCS. When the molar ratio of TMCS to AlCl3 center dot 6H(2)O is 0.35, hydrophobic alumina aerogels shows lower bulk density (0.453 g/cm(3)) and higher surface area (495 m(2)/g) than those of unmodified alumina aerogels (0.933 g/cm(3), 413 m(2)/g).

• 出版日期2017-6
• 单位东南大学