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. 2018 Feb 13;16:13. doi: 10.1186/s12951-018-0340-7

Fig. 2.

Fig. 2

Morphological characterization of PLA-coated MSNPs. a TEM images of PLA-coated MSNPs with different mass ratio (1:0, 1:0.25, 1:0.5 and 1:1). Scale bar = 50 nm. b SEM images indicate the difference of surface morphology of MSNPs with (1:0.25) or without (1:0) PLA coating