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. 2022 Feb 13;14(4):722. doi: 10.3390/polym14040722

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© 2022 by the authors.

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 (https://creativecommons.org/licenses/by/4.0/).

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Echogenicity of the aerogels at 8.5 MHz tabulated according to the classifications indicated in Table 3: (a) SC and (b) SM compared to control, calculated using Equation (4a,b), Table 2.