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Preparation and characterization of the nanoparticles prepared by SPs with variable A2 units. (A) Scheme illustration of the nanoparticles prepared by these DPP-based SPs with different A2 units (SP@NPs) through single emulsion with the assist of mPEG-b-PHEP. (B) Chemical structures of these DPP-based SPs with variable A2 units (PhT, TVT, DPT, and TT). (C, D, E) Size distributions (C), photograph (D), and TEM images (E) of SP@NPs. The scale bars were 100 nm.
