Add time:07/31/2019         Source:sciencedirect.com

Monolithic mechanically reinforced CNTs-SILICA (cas 10279-57-9) aerogel composites have been successfully synthesized by two-step sol-gel methodology, using methyltrimethoxysilane as the main silica precursor, combined with an ecofriendly ethanol/water mixture as solvent, and dried at ambient pressure. For an effective linkage of the carbon nanotubes with the silica network, the CNTs were submitted to a silanization treatment. With this approach, the chemical binding between the two phases takes place, with the silica particles following the elongated shape of CNTs, which leads to an improvement of the mechanical properties, with Young's modulus up to 201.5 kPa, when compared to the corresponding silica aerogel counterpart without CNTs (104.9 kPa). Moreover, the developed materials show high porosities (up to 95.8%), low densities (as low as 61.3 kg m−3), good thermal insulation performance of 31.2–44.1 mW m−1 K−1 and superhydrophobic character. The significant improvements regarding physical and mechanical properties make these composite aerogels attractive for several applications, ranging from thermal insulators to adsorbents.

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