Fig. 2: Fabrication mechanism, morphology, composition, and wettability of HNF-X membranes.
From: Biomimetic Janus membrane with spongy channels for directional liquid transport
a Binding schematic of CA and TPU chains with/without PDA molecules. SEM images of HNF-X membranes: b HNF-0; c HNF-2; d HNF-4. e Double-layer strip model of side-by-side electrospun HNF-X. (e-i) Fiber curved/helical structure without adding PDA content. (e-ii) More helical structure with the addition of an appropriate amount of PDA. (e-iii) Curved/straight structure with excessive PDA content. f Curves of helical curvature K and pitch H versus the content of PDA. Error bars in (f) represent standard deviations, n = 100 independent measurements. g FTIR spectra. h Contact angle. Error bars in (h) represent standard deviations, n = 3 independent samples.
