Figure 1

AFM micrographs of pristine CTA and PAES HD membrane fibers collected for two different spots in close proximity (a and b, first second rows); micrographs of the inner and outer surfaces of the polymer membrane fibers are placed in the first and second columns, respectively. SEM micrographs of CTA and PAES HD membrane fiber surfaces (c), magnified surface images thereof (d), and whole microtubes (e).