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Kinetics of Gd3+ release as NaGdF4 NPs were dialyzed against DI water and excess mPEG-phosphate. (A) Particles capped with mPEG2000-OPO3H2 and then dialyzed against DI water or mPEG2000-OPO3H2. (B) Particles capped with mPEG750-OPO3H2 and then dialyzed against DI water or mPEG750-OPO3H2. In each part: dialysis against DI water (bottom trace), against 1.0 mM mPEG-phosphate (middle trace), 2.5 mM mPEG-phosphate (upper trace).
