A stable superhydrophobic and superoleophilic Cu mesh based on copper hydroxide nanoneedle arrays

► Prepare a stable superhydrophobic and superoleophilic copper mesh. ► Perfluoroalkylsilane-modified Cu(OH)2 nanoneedle surface maintains superhydrophobic property after the wet treatment in pH 2-14. ► Dynamic permeation behaviors exhibit a potential use in oil/water separation.