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. 2021 Dec 20;13(12):2200. doi: 10.3390/pharmaceutics13122200

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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/).

PMC Copyright notice

HRTEM images from (a) MSN and amine-functionalized MSN with TEOS:APTES mole ratio (b) 90:10—MSN-10N and (c) 70:30—MSN-30N. Adapted with permission from [43]. Copyright 2018 Elsevier (Amsterdam, The Netherlands).