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. 2022 Nov 11;11(11):1606. doi: 10.3390/antibiotics11111606

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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The 3-D response surface plots for (A) the interaction between pH and reaction temperature (X₁X₂), (B) the interaction between pH and stirring rate (X₁X₃), (C) and the interaction between reaction temperature and stirring rate (X₂X₃) on particle size (Y₁) of ZnO-NPs while keeping the third variable at an average value between its high and low levels.