Scalable Fabrication of Superhydrophobic Coating with Rough Coral Reef-Like Structures for Efficient Self-Cleaning and Oil-Water Separation: An Experimental and Molecular Dynamics Simulation Study.

Cai, Huidong; Duan, Chongxiong; Fu, Mingli; Zhang, Jin; Huang, Haomin; Hu, Yun; Shi, Jie; Ye, Daiqi

Cai, Huidong; Duan, Chongxiong; Fu, Mingli; Zhang, Jin; Huang, Haomin; Hu, Yun; Shi, Jie; Ye, Daiqi.

Afiliación

Cai H; School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
Duan C; School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510006, China.
Fu M; School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
Zhang J; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, China.
Huang H; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou Higher Education Mega Centre, Guangzhou, 510006, China.
Hu Y; School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
Shi J; School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
Ye D; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, China.

Small ; 19(32): e2207118, 2023 Aug.

Article en En | MEDLINE | ID: mdl-37058126

RESUMEN

Superhydrophobic coating has a great application prospect in self-cleaning and oil-water separation but remains challenging for large-scale preparation of robust and weather-resistant superhydrophobic coatings via facile approaches. Herein, this work reports a scalable fabrication of weather-resistant superhydrophobic coating with multiscale rough coral reef-like structures by spraying the suspension containing superhydrophobic silica nanoparticles and industrial coating varnish on various substrates. The coral reef-like structures effectively improves the surface roughness and abrasion resistance. Rapid aging experiments (3000 h) and the outdoor building project application (3000 m2 ) show that the sprayed superhydrophobic coating exhibits excellent self-cleaning properties, weather resistance, and environmental adaptability. Moreover, the combined silica-coating varnish-polyurethane (CSCP) superhydrophobic sponge exhibits exceptional oil-water separation capabilities, selectively absorbing the oils from water up to 39 times of its own weight. Furthermore, the molecular dynamics (MD) simulation reveals that the combined effect of higher surface roughness, smaller diffusion coefficient of water molecules, and weaker electrostatic interactions between water and the surface jointly determines the superhydrophobicity of the prepared coating. This work deepens the understanding of the anti-wetting mechanism of superhydrophobic surfaces from the perspective of energetic and kinetic properties, thereby paving the way for the rational design of superhydrophobic materials and their large-scale applications.

Palabras clave

coral reef-like structures; molecular dynamics simulations; oil-water separation; scalable fabrication; superhydrophobic

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Small Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania

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