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General synthetic scheme for amphiphilic tri-block copolymers, and electron microscopy of the resulting micellar nanoparticles. (a) Polymer 1: m = 38, n = 34, p = 50. Polymer 2: m = 20, n = 23, p = 43; (b–d) Electron microscopy of SMN formed from Polymer 1: (b) cryo-TEM. (c) BF-STEM. (d) HAADF-STEM; (e-g) Electron microscopy of CMN formed from Polymer 2: (e) cryo-TEM. (f) BF-STEM. (g) HAADF-STEM.
