Figure 2.

(A) The conditions for vesicle formation, the hydrodynamic diameter, and the size distribution of the corresponding PBMA₇₅-b-PNAM₅₁ vesicle and its cytotoxicity profile in aqueous solution. (B) Transmission electron microscopy image of the morphology of the well-defined vesicles with hydrophilic hollow inner space and hydrophobic bilayer and structural confirmation by nuclear magnetic resonance spectroscopy.

Abbreviations: PBMA₇₅-b-PNAM₅₁, poly(n-butyl methacrylate)_x-b-poly(N-acryloylmorpholine)_y, with hydrophobic to hydrophilic block ratio regulated at 73/51; PEI, polyethylenimine.