Figure 6.

(a) Schematic representation of the one-pot synthesis of polyacrylic acid (PAA) coated Gd₂O₃ NDs, (b) the representative PAA surface-coating structure, (c) DLS measurement of (i) PAA 1200, (ii) PAA 5100, and (iii) PAA 15,000 coated Gd₂O₃ NDs, inset of (c) is the hydrodynamic diameter of PAA coated Gd₂O₃ NDs as a function of PAA molecular weight, and (d) r₁ and r₂ values as a function of PAA molecular weight (adapted from Lee et al. 2019 [69], Copyright 2017 the Elsevier B.V. and reproduced with permission).