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Photothermal superhydrophobic coatings offer immense promise for anti-icing and deicing applications. However, achieving long-term passive anti-icing and active deicing in photothermal superhydrophobic coating remains a significant challenge. We introduce a durable photothermal superhydrophobic coating, coprepared from water-soluble polytrimethylsiloxane (PMATF) in synergy with cactus-inspired composite nanoparticles (MPCS), which is composed of MoS 2 , polydopamine (PDA), Cu nanoparticles, and octadecanethiol (18-SH). The PM-MPCS coating exhibits a maximum water contact angle (WCA) of 171.8° and retains a high WCA after 330 cycles of sandpaper abrasion and 210 cycles of tape peeling. Additionally, the PM-MPCS coating exhibits exceptional photothermal conversion ability. The PM-MPCS films attain a surface temperature of 86.9 °C, displaying a photothermal conversion efficiency of 77.4%. In anti-icing tests conducted at -15 °C, PM-MPCS significantly prolonged the freezing time; the freezing time of a 5 μL water droplet was extended to 43 min. The active deicing performance is similarly effective, with PM-MPCS melting a 5 μL ice sphere in 5.5 min. Furthermore, PM-MPCS exhibits a low ice adhesion strength of 6.0 kPa, enabling effective ice removal even after numerous freeze-thaw cycles. The exceptional anti-icing and deicing performance can be attributed to the synergistic effects of the composite nanoparticles, which minimize ice penetration and enhance the photothermal conversion capabilities of the particles. These findings underscore the potential of PM-MPCS as a viable candidate for advanced anti-icing and deicing applications across various industries.

In the present work, self-cleaning membranes of ionic liquid-grafted poly(vinylidene fluoride) (PVDF) polydopamine-coated TiO 2 were prepared through a nonsolvent-induced phase separation method. PDA facilitates the uniform dispersion of TiO 2 nanoparticles in PVDF substrates; meanwhile, TiO 2 @PDA core-shell particles and the hydrophilic IL improve the hydrophilicity of PVDF membranes and contribute to the increased average pore size and porosity, significantly improving the pure water permeation flux and dye wastewater flux (the water flux increased to 385.9 Lm -2 h -1 ). In addition, the combined effect of the positively charged IL and the strongly viscous PDA shell layer enhanced the retention and adsorption of dyes so that the retention and adsorption rates of both anionic and cationic dyes were close to 100%. Notably, the hydrophilic PDA allowed more TiO 2 to migrate to the membrane surface during the phase transition; on the other hand, dopamine could promote photodegradation. Therefore, the combined two factors for TiO 2 @PDA were beneficial to the ultraviolet-catalytic (UV-catalytic) degradation of dyes on the surface of the membrane, leading to >80% degradation rates of various dyes. Thus, the high-efficiency and easy-to-operate wastewater treatment technology provides attractive potential for dye removal and resolution of membrane contamination.