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. 2020 Dec 7;18:178. doi: 10.1186/s12951-020-00739-7

Fig. 1.

Fig. 1

Properties of positively charged PCS NPs. a Schematic representation of PLGA-PEI PCS NPs. b ζ-potential. c Size. d TEM image. e SEM image. f Stability test of PLGA-PEI PCS NPs in the medium and PBS