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Preparation and measurement of fog-harvesting efficiency of VFM and 3D VFM: (a) preparation of material (polymer filaments, metal wires) and wood frame followed by winding of the filament on the wooden frame (vertical filament mesh); (b) spraying the mixed solution of PU–SA on the filament surface of VFM; (c) representation of the one-layer (single-layer) VFM, two-layer 3D VFM, and four-layer 3D VFM; and (d) schematic diagram of the experimental setup for fog harvesting of VFM.
