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. 2019 Aug 31;9(9):1238. doi: 10.3390/nano9091238

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© 2019 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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Average hydrodynamic size distribution of sample A: (a) as-prepared sample (polydispersity index (PDI) = 0.84), (b) after first UF purification step followed by sonication (PDI = 0.47), (c) after second UF purification step followed by sonication (PDI = 0.25), (d) after third UF purification step followed by sonication (PDI = 0.10).