Superamphiphobicity was achieved by HCl-etching, H2O-treatment and POTS grafting.
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The HCl-H2O-POTS surface repels liquids with surface tension from 72.8 to 27.5 mN·m−1.
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Outstanding chemical stability was confirmed with pH values ranging from 1 to 14.
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The surface exhibits repeatability and stability after 20 times self-cleaning tests.
Abstract
The achievement of superamphiphobic material with ultralow sliding angles is a highly worthwhile and challenging task because the current artificial superhydrophobicity can be easily contaminated and wetted by low surface tension liquids. Herein, we construct superamphiphobic 5083 aluminum alloy surface through a facile strategy including sono-assisted HCl etching, boiling H2O treatment and POTS grafting. Micro-nano dual scale hierarchical structure was achieved, attributing to air cushion formation and Cassie contacts. The as-prepared superamphiphobic HCl-H2O-POTS AA5083 surface has a wide range of liquids repellency to water, glycerol, ethylene glycol, peanut oil and even n-hexadecane (surface tension: 27.5 mN·m−1). The superamphiphobic surface also possesses outstanding self-cleaning ability for contaminants and chemical stability for liquid droplets with different pH values. All these advantages will endow the superamphiphobic HCl-H2O-POTS surface with broad applications prospects, including automobile, aerospace, military and marine industries.
Graphical abstract
Self-cleaning and chemically stable superamphiphobic HCl-H2O-POTS AA5083 surface was developed through a facile strategy of sono-assisted HCl etching, boiling H2O treatment and POTS grafting.