(511g) Facile Fabrication of Highly Omniphobic and Self-Cleaning Surface Based on Water Mediating Fluorinated Hybrid Nanocomposite

Liquid repellent surfaces are being promisingly applied in industry and our daily life. Herein we reported a simple and effective approach to fabricate omniphobic coatings with multi-scale composite structure by hydrolytic condensation of methyltriethoxysilane (MTES) and 3-[(perfluorohexyl sulfonyl) amino] propyltriethoxysilane (HFTES) and nanosilica sol. It is a one-step approach to precisely regulate the hierarchical structure and wettability of resultant surface via manipulate the aggregation of nanosilica by mediating water content. The fluorinated nano-sol can be easily coated on various hard and soft substrates by spraying or dipping methods, endowing the substrate with omniphobicity to different organic liquid. The optimized hybrid coatings exhibit outstanding superhydrophobic and oleophobic performances with static angle of 157.9°, 146.4°, 148.0°, 134.0° for water, diiodomethane, glycol and n-hexadecane respectively. The multi-scale roughness structure strengthens the water and oil repellency of the hybrid coatings significantly even under high temperature and keeps the similar hydrophobicity and oleophobicity after being treated at extreme acidic (pH=1) and basic (pH=14) conditions. Furthermore, the hybrid coating surfaces show outstanding self-cleaning performance and resistance to blood and egg white adhesion and have a great thermal stability below 350 â??. Owing to the facile method and its remarkable omniphobicity abilities in various conditions, the fluorinated nanosilica sol can be expected to have potential industry applications in many areas.