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SEM images of the SF-KGN microspheres (A–C) and SF-BBR microspheres (D–F). DLS measurements for the SF-KGN microspheres (G) and SF-BBR microspheres (H). Zeta potential (I) and FTIR spectra (J) of the microspheres. ∗∗P < 0.01 and ∗∗∗P < 0.001.
