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. 2020 Jul 10;10:11422. doi: 10.1038/s41598-020-68122-y

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) A picture of centrifugation tubes containing the pellets and supernatants of solutions of unheated (left) and heated (74 °C, right) solutions of core–shell–hull (dotriacontane) nanoparticles after centrifugation, with the corresponding schematic representations of the state of the nanoparticles. (b) The fluorescence emission signal of the supernatant obtained from the centrifugation tubes, upon excitation at 530 nm. (c) An image of cuvettes containing solutions of the re-suspended nanoparticles taken from the pellets in the centrifugation tubes. (d) Fluorescence spectroscopy of the solutions displayed in (c), conducted by sweeping the excitation wavelength and measuring the resulting emission at the 612 nm wavelength.