. 2018 Sep 25;23(10):2447. doi: 10.3390/molecules23102447
© 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/).
Figure 9.
Flowchart of the sol-gel procedure used.