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. 2021 Apr 19;19:111. doi: 10.1186/s12951-021-00854-z

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© The Author(s) 2021

Open AccessThis 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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Characterization of NPs and MPNs. a MALDI-TOF mass spectra of mPEG-LA (blue) and MPNs (green). b Relationship between the fluorescence intensity ratio (I₃₃₈/I₃₃₄) and the mPEG-LA concentration in an aqueous solution at 25 ℃, [pyrene] = 6.7 × 10^–7 M. Insert: transmission electron microscope (TEM) image of NPs. Scale bar: 100 nm. c DSC heating and cooling curves (10 ℃ min⁻¹) for mPEG-LA (blue curve) and MPNs (green curve) from – 5 to 60 ℃ in nitrogen atmosphere. d Time-dependent size variation of NPs and MPNs at a physiological pH and a salt concentration at 25 ℃ (n = 3)