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SEM surface images of (a) CTA pristine, (b) CTA-1 wt.% SiO2, (c) CTA-2 wt.% SiO2, (d) CTA-3 wt.% SiO2, (e) CTA4 wt.% SiO2 membranes, SEM cross-sectional images of (f) CTA pristine, (g) CTA-1 wt.% SiO2, (h) CTA-2 wt.% SiO2, (i) CTA-3 wt.% SiO2, and (j) CTA-4 wt.% SiO2 of membranes. Reprinted with permission from Ref. [286]. Copyright 2020 Prihatiningtyas I. et al.
