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SEM images of freeze-dried TIPS sphere and cross-sections of (a,b) PLA and (c,d) PLA-BG. Scale bar = 100 µm, and insect = 1 mm. (e) PLA-BG composite filament, showing improved BG dispersion within the PLA matrix, surface (blue square), and cross-section (green square). Scale bar = 50 µm.
