Influence of 1D and 2D carbon nanostructures in silica-based aerogels
authors Lamy-Mendes, A; Malfait, WJ; Sadeghpour, A; Girao, AV; Silva, RF; Duraes, L
nationality International
journal CARBON
author keywords Silica aerogel composite; Multi-walled carbon nanotubes; Graphene oxide; Nano-and microstructure; Thermo-mechanical properties; Electrochemical behavior
keywords HIGH-SURFACE-AREA; GRAPHENE-OXIDE; THERMAL-CONDUCTIVITY; POLYMETHYLSILSESQUIOXANE AEROGELS; MECHANICAL-PROPERTIES; NANOTUBE; NANOCOMPOSITES; SPECTROSCOPY; ELECTRODES; XEROGELS
abstract Carbon nanostructures-silica aerogel composites were synthesized and characterized to assess the effect of carbon nanotubes (CNTs) or graphene oxide (GO) on the silica aerogel properties. The sol-gel chemistry was based on methyltrimethoxysilane (MTMS) and 3-aminopropyltrimethoxysilane (APTMS) as silica precursor system, with varying amounts of APTMS (0-20% mol of Si). APTMS significantly impacted the materials' physical properties. The chemistry and microstructure were investigated by FTIR, NMR, TEM, SEM, SAXS and BET. The addition of CNTs induced the growth of the silica matrix around them; thus, an elongated shape was observed in the silica structural units. APTMS and CNTs have a synergistic effect on the mechanical properties, increasing the Young's modulus up to 14 MPa. Small amounts of carbon materials (similar to 1 wt%) in the MTMS-matrix improved its thermal insulation property, particularly for temperatures above 50 degrees C. In terms of electrochemical properties, the carbon nanostructures lead to higher specific capacitances and a reduction in resistance. The characterizations here performed allowed a better understanding of the interactions between the silica and carbon phases. The possibility to obtain materials with tailored properties demonstrates their application potential in several areas, such as thermal insulation and energy storage. (C) 2021 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0008-6223
isbn 1873-3891
year published 2021
volume 180
beginning page 146
ending page 162
digital object identifier (doi) 10.1016/j.carbon.2021.05.004
web of science category 17
subject category Chemistry, Physical; Materials Science, Multidisciplinary
unique article identifier WOS:000661446600001
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journal analysis (jcr 2019):
journal impact factor 8.821
5 year journal impact factor 7.984
category normalized journal impact factor percentile 86.965
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