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NSHs based on covering hydrophobic layers on hydrophilic hydrogel surfaces. a) Schematic formation of PAM nanocomposite hydrogel with gradient distribution of hydrophobic imide groups. Adapted with permission.[ 214 ] Copyright 2020, The Royal Society of Chemistry. b) The preparation illustrations of anti‐swelling SGC with robust interface. Adapted under the terms of the Creative Commons CC BY license.[ 210b ] Copyright 2022, The Authors.
