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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
FTIR (a) full spectra, (b) zoom-in spectra in the band between 1300 to 900 cm−1, and (c) zoom-in spectra in the band between 1800 to 1400 cm−1 of the TC aerogel, Res, and RLTAs.