fig2

Figure 2. SEM images of (A) PLS-3-50, (B) PLS-3-100, (C) PLS-3-200 and (D) PLS-3-250. SEM: Scanning electron microscope.
Figure 2. SEM images of (A) PLS-3-50, (B) PLS-3-100, (C) PLS-3-200 and (D) PLS-3-250. SEM: Scanning electron microscope.
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