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Representative reversible switching in (a) static water CA on a PMA–SP-brush-modified PP membrane and film, measured with 3 μL water droplets and in (b) water flux through a pristine and an SP-modified PP membrane under a pressure of 750 mbar upon alternating exposure to visible and UV light. The error in the values is estimated to be below 2° for CA and below 3 L m–2 h–1 for flux measurements.
