Fig. 3.
Scanning electron microscope (SEM) images of a LBS particle. The length of the white bar in the bottom panel of each image shows the scale: 1 mm in (a), 100 μm in (b), 10 μm in (c) and 1 μm in (d) Refer to the image caption for details.

Scanning electron microscope (SEM) images of a LBS particle. The length of the white bar in the bottom panel of each image shows the scale: 1 mm in (a), 100 μm in (b), 10 μm in (c) and 1 μm in (d)

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