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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/).
Average particle size determined from SEM images of Figure 6: Figure 6a: TEOS:PrTMS; Figure 6b: TEOS:DTMS; and Figure 6c: TEOS:ODTMS at a molar ratio of 5:5.