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. 2021 Sep 27;11:19173. doi: 10.1038/s41598-021-98783-2

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Size distribution of BNBs in water. Time evolution of size distribution: (a) case 1, (b) case 2. The initial size distribution of BNBs was in the range of 10–250 nm. The number of smaller particles decreased, while larger particles grew in size over time (approximately in the 10–530 nm range after 6 days).