Growth of a superhydrophobic coating on an aluminium substrate with strong adhesive properties and showing efficient oil/water separation

Fluorine free superhydrophobic coating on cotton fabric by inexpensive dip coating method. The coated fabric exhibited high oil–water separation efficiency.

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Efficient Oil-Water Separation Coating With Robust Superhydrophobicity and High Transparency

10.21203/rs.3.rs-930057/v1 ◽

2021 ◽

Author(s):

Baiyi Chen ◽

Rongrong Zhang ◽

Hexuan Fu ◽

Jiadai Xu ◽

Yuan Jing ◽

...

Keyword(s):

Superhydrophobic Surface ◽

Large Scale ◽

Separation Efficiency ◽

Operating Conditions ◽

Superhydrophobic Coating ◽

Water Separation ◽

High Transparency ◽

Candle Soot ◽

Oil Water Separation ◽

Oil Water

Abstract There has been a growing interest in oil-water separation due to the massive economic and energy loss caused by world-wide oil spill. In the past decades, a new type of superhydrophobic surface has been developed for the efficient oil-water separation, but its large-scale use is significantly limited by its expensive, sophisticated, and fragile roughness structure. Meanwhile, to handle complex operating conditions, the transparency of the superhydrophobic surface has been more attractive due to its potential visual oil-water separation and optical applications. Herein, we showed a simple and versatile strategy to fabricate superhydrophobic coating with robustness and high transparency. Subsequently, this multifunctional superhydrophobic coating was utilized for oil-water separation and indicated excellent separation efficiency. In this strategy, candle soot composed of carbon nanoparticles was deposited onto the substrate and used as a rough surface template. Then, a filmy and hard silica shell was modified onto this template via chemical vapor deposition to reinforce the roughness structure. Following, this soot-silica coated substrate was calcined in air to remove the candle soot template. Finally, based on a rational surface design, this robust silica coating achieved excellent superhydrophobicity thereby showing inherently oil-water separation benefits. This reinforced superhydrophobic coating presented robust superhydrophobicity even after 410 s sand impacting with the height of 40 cm. Also, it retained excellent oil-water separation efficiency even after reuses.

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Synthesis of Durable Superhydrophobic Coating and Its Applications in Oil/Water Separation

Science of Advanced Materials ◽

10.1166/sam.2020.3690 ◽

2020 ◽

Vol 12 (5) ◽

pp. 676-684 ◽

Cited By ~ 3

Author(s):

Guo-Qiang Xi ◽

Jun-Feng Li ◽

Hui Deng ◽

Ming-Guo Ma

Keyword(s):

Water Resistance ◽

Collection Efficiency ◽

Superhydrophobic Surfaces ◽

Superhydrophobic Coating ◽

Water Contact ◽

Water Separation ◽

Potential Applications ◽

Oil Water Separation ◽

Oil Water ◽

Self Cleaning

Superhydrophobic surfaces have received enormous attention thanking to their potential applications in the areas of anti-icing, anti-contamination, and oil/water separation. Herein, we have successfully prepared superhydrophobic surfaces, which were synthesized by using the polydimethylsiloxane (PDMS) as adhesive and the magnesium palmitate (Mg-P) were evently coated to form roughness on the surfaces of glass, textile, stainless steel mesh, and paper. The as-fabricated superhydrophobic surfaces possessed excellent water-resistance, self-cleaning properties, durability, and robustness. Remarkably, in the actual oil/water separation, the water contact angle and oil collection efficiency of the superhydrophobic mesh were still more than 150° and 91% even after separation over 10 cycles, respectively. Thus, the superhydrophobic coating has applications potential in self-cleaning, anti-contamination, and oil/water separation fields.

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