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(a) Volume-weighted size distribution of GQD-PEG-BFG sample; (b) zeta potential measurement of GQD-PEG-BFG sample; (c) volume-weighted size distribution of GQD-PEG-BFG@Pyr-RF sample; (d) zeta potential measurement of GQD-PEG-BFG@Pyr-RF sample. All the experiments were performed in PBS solutions at pH 7.4.
