Robust Superhydrophobic Coating with Exceptional Durability

Researchers at Guizhou Normal University have fabricated a superhydrophobic composite coating with exceptional durability, demonstrating potential applications in construction, ships, and electronic devices under extreme conditions. The coating, composed of octadecyltrimethoxysilane (ODTMS)-modified halloysite nanotubes (HNTs) integrated into a polyurea (PU) matrix, exhibits a hierarchical micro-nano structure that synergizes with low surface energy to achieve a water contact angle of 157 degrees. The coating retains its superhydrophobicity after 50 tape-peeling cycles and 130 cm sandpaper abrasion, attributed to the dual reinforcement mechanism of PU's elasticity and HNTs' mechanical robustness.

Key Takeaways:

• The researchers fabricated a superhydrophobic composite coating by integrating ODTMS-modified HNTs into a PU matrix, achieving a water contact angle of 157 degrees.
• The coating exhibits exceptional durability, retaining its superhydrophobicity after 50 tape-peeling cycles and 130 cm sandpaper abrasion.
• The hierarchical micro-nano structure of the coating, constructed through hydrogen bonding networks between PU and HNTs, synergized with low surface energy to achieve exceptional durability.
• The coating also exhibits pH stability (pH 2-12 for 20 h) and thermal resistance up to 250 degrees C.
• The researchers obtained Fourier-transform infrared spectroscopy, X-ray powder diffractometer, and X-ray photoelectron spectroscopy analyses to confirm successful ODTMS grafting and homogeneous dispersion of HNTs within the PU matrix.
• The study provides a scalable strategy for designing durable superhydrophobic coatings, demonstrating potential applications in construction, ships, and electronic devices under extreme conditions.

Statistics:

• Water contact angle of 157 degrees achieved by the superhydrophobic composite coating.
• Coating retained its superhydrophobicity after 50 tape-peeling cycles.
• Coating retained its superhydrophobicity after 130 cm sandpaper abrasion.
• pH stability of the coating demonstrated over 20 h in pH 2-12.
• Thermal resistance of the coating demonstrated up to 250 degrees C.

Sources:

• Robust Superhydrophobic Polyurea Composite Coating With Octadecyltrimethoxysilane-modified Halloysite Nanotubes: Hierarchical Design for Mechanical and Chemical Durability In Harsh Environments. Progress In Organic Coatings, 2025;208.
• Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland (www.elsevier.com; www.journals.elsevier.com/progress-in-organic-coatings/)
• Fuping Dong, Guizhou Normal University, College of Materials & Metals, Dept. of Polymer Materials and Engineering, Guiyang 550025, People's Republic of China.