Fig. 2: Structure characterization and gas-switchable wettability of PPFM. | Nature Communications

Fig. 2: Structure characterization and gas-switchable wettability of PPFM.

From: Scalable and switchable CO2-responsive membranes with high wettability for separation of various oil/water systems

Fig. 2

A Time-dependent change in WCA for PPFM-0.5 with gap width of 150 μm under CO2/N2 treatment. The CO2 and N2 were purged at 25 °C. The gas flow rate was 20 mL min−1. B Dynamic optical images of the wettability of a water droplet on PPFM-0.5 with gap width of 150 μm in different states. C Range of WCA values of our PPFM and other stimuli-responsive membranes reported in the literature48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73. D Schematic illustration of the surface-wetting mechanism of PPFM under CO2/N2 stimulation. E 1H NMR spectra of PMMA-co-PDEAEMA copolymer in D2O and tetrahydrofuran-D8 (1:1) before and after bubbling CO2. F In situ FTIR spectra of PPFM-0.5 under CO2/N2 stimulation.

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