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Fabrication and characterization of the monolithic hydrophobic alumina aerogels

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Abstract

The monolithic hydrophobic mesoporous alumina aerogels were successfully synthesized by acid–base sol–gel polymerization of aluminium chloride hexahydrate (AlCl3·6H2O) 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 AlCl3·6H2O is 0.35, hydrophobic alumina aerogels shows lower bulk density (0.453 g/cm3) and higher surface area (495 m2/g) than those of unmodified alumina aerogels (0.933 g/cm3, 413 m2/g).

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Acknowledgments

This work was financially supported by National Nature Science Foundation of China (21206018) and National Nature Science Foundation of Jiangsu Province of China (BK20151408).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China

    Xueai Li, He He & Lili Ren

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  1. Xueai Li
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  2. He He
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  3. Lili Ren
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Correspondence to Lili Ren.

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TGA curves of unmodified alumina aerogel (black) and modified aerogel (red) (DOC 272 kb)

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Li, X., He, H. & Ren, L. Fabrication and characterization of the monolithic hydrophobic alumina aerogels. J Porous Mater 24, 679–683 (2017). https://doi.org/10.1007/s10934-016-0304-y

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