Robust multifunctional superhydrophobic and photocatalytic composites with all-weather self-healing ability

Superhydrophobic surfaces with rapid self-healing ability are ideal for long-life superhydrophobic materials. The micro-nano rough structure has great influence on the superhydrophobicity, and the micro-dissolution cotton fabric can realize the stable load of nanoparticles. In this regard, we prepared multifunctional fabrics with an allweather self-healing superhydrophobic layer and photocatalytic self-cleaning properties by spraying TiN and TiO2 on micro-dissolution-treated polypyrrole/cotton fabrics. The results show that the modified fabrics maintain superhydrophobicity even in harsh environments (water contact angle (WCA) up to 160.0 degrees, water sliding angle (WSA) as low as 3.9 degrees), with excellent abrasion resistance and stability. Even after the fabric loses superhydrophobicity due to ion etching, the superhydrophobicity can be quickly restored by photothermal or electrothermal treatment in 13 min. At the same time, the prepared multifunctional fabrics have hydrophobic and oleophilic properties, and possess good oil-water separation efficiency (98.8 %). After being contaminated by oil, the WCA recovers from 135.0 degrees to 160.0 degrees via the photocatalytic property of the fabric. In addition, the fabrics exhibit excellent de-icing effects. This research provides new opportunities to extend the life of superhydrophobic textiles with all-weather self-healing properties.