Fig. 4: Evaporation enhancement mechanisms.
From: High-flux and anti-fouling membrane distillation membrane with VOC capture ability enabled by ZIF-8

a Number of water molecules escaping per square nanometer surface from ZIF-8 with fixed imidazole linkages and ZIF-8 with freely rotating imidazole linkages. b Ratio of the number of hydrogen bonds of 0–2000 ps water molecules on the surface of ZIF-8 with fixed imidazole linkages and ZIF-8 with freely rotating imidazole linkages (N) to the number of original hydrogen bonds (N0). c Snapshots showing water evaporation on ZIF-8 with fixed and freely rotating imidazole linkages at 0, 200, and 500 ps.