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. 2020 Jul 24;13(8):162. doi: 10.3390/ph13080162

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© 2020 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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Scanning electron microscopy photographs of (A) Pure DFX, (B) Syloid XDP 3150, (C) P5-40-SYLOID, (D) Neusilin US2, (E) P5-40-US2, (F) Neusilin UFL2, and (G) P5-40-UFL2.