Polysilsesquioxane-based silica aerogel monoliths with embedded CNTs
authors Lamy-Mendes, A; Girao, AV; Silva, RF; Duraes, L
nationality International
journal MICROPOROUS AND MESOPOROUS MATERIALS
author keywords Silica aerogel composite; Methyltrimethoxysilane; Multi-walled carbon nanotubes; Monolith; Hydrophobicity
keywords CARBON NANOTUBE; THERMAL-CONDUCTIVITY; MECHANICALLY STRONG; RAMAN-SPECTROSCOPY; FTIR SPECTROSCOPY; NITROGEN SORPTION; METHYLTRIMETHOXYSILANE; ADSORPTION; MICROSTRUCTURE; GRAPHITE
abstract Monolithic mechanically reinforced CNTs-silica aerogel composites have been successfully synthesized by two-step sol-gel methodology using methyltrimethoxysilane as the main silica precursor, combined with an eco-friendly 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.
publisher ELSEVIER
issn 1387-1811
isbn 1873-3093
year published 2019
volume 288
digital object identifier (doi) 10.1016/j.micromeso.2019.109575
web of science category Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000482515600036
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journal analysis (jcr 2019):
journal impact factor 4.551
5 year journal impact factor 4.157
category normalized journal impact factor percentile 71.108
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