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Au nanoparticles carrying linear or loop PEG shells. (A) Structure of linear and loop PEG ligands and binding over Au nanoparticle surface. (B) Au nanoparticles with linear (top) or loop (bottom) PEGs of different sizes (1, 5, or 10 kDa; from left to right) representing changes in the graft density and hydrodynamic radii of the different polymeric shells. Reprinted with permission from reference [52]. Copyright (2019) American Chemical Society.
