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. 2021 Mar 15;14(6):1419. doi: 10.3390/ma14061419

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© 2021 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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The results of ζ-potential analysis as a pH function at 25 °C (A). Figure (B) shows the correlation between ζ-potential at pH = 2 and XPS-determined oxygen content. Determination coefficient was calculated for three samples (single-walled carbon nanohorn (SWCNH)-ox-0.5; 1; 3).