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. 2018 Oct 19;10(4):195. doi: 10.3390/pharmaceutics10040195

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© 2018 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 (http://creativecommons.org/licenses/by/4.0/).

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High Resolution Transmission Electron Microscopy (HRTEM) images of bare (MSN-OH, A), aminopropyl (MSN-NH₂, B), cyanopropyl (MSN-CN, C) and carboxypropyl-functionalized (MSN-COOH, D) mesoporous silica nanoparticles.