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(a) Schematic illustration of water flow on natural super-hydrophobic surfaces [47]; (b) scheme showing a stomata-inspired membrane with reversible self-actuated thermo-responsive pores; (c) the respirational pore structure of a leaf (stomata) that can open and close in response to light, temperature and humidity for gas exchange [45]; (d) WCAs and MCAs; (e) hydrostatic pressure; (f) air permeability; and (g) WVTRs of pristine TPU and TPU-PMx NFMs [115].
