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SEM images of untreated of: (a) glass; (b) copper foam; (c) filter paper; (d) sponge; (e–h) surface morphology of the corresponding epoxy resin+PDMS@SiO2-coated samples; and (i–l) SEM images of the coated samples at higher magnification (Reprinted from [44] with permission from Elsevier). (m) Schematic illustration of the spraying process (Reprinted with permission from [43]. Copyright {2021} American Chemical Society).
