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. 2021 Nov 4;13(11):1860. doi: 10.3390/pharmaceutics13111860

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© 2021 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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SEM images of selected samples, where 1 is a sample without Neusilin^® US2 (N0), 2 is a sample with 25% (w/w) of Neusilin^® US2 (N). The remaining samples had a specific surface area modified by the addition of volatile substances, which sublimed during drying: samples 3 (M7.5) and 4 (M20.0) originally contained 7.5% and 20.0% (w/w) menthol, similarly samples 5 (C7.5) and 6 (C20.0) contained camphor and samples 7 (AB7.5) and 8 (AB20.0) contained ammonium bicarbonate. In addition, (a–c) denote the whole pellet, the surface detail and the cross-section detail, respectively.