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. 2017 May 23;34(8):1693–1706. doi: 10.1007/s11095-017-2177-4

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Characterization of the MSNs and AEP-MSNs. TEM images of (a) MSNs and (b) AEP-MSNs. Scale bar = 200 nm. (c) Nitrogen adsorption-desorption isotherms and (d) plots of pore diameter vs. pore volume (inset), calculated from the desorption isotherms using BJH model, show that the MSNs and AEP-MSNs have an average pore diameter of 10 nm and 9 nm, respectively.