Metal matrix composites for sustainable lotus-effect surfaces

Area of Science:

• Materials Science
• Surface Science
• Tribology

Background:

• The lotus effect creates superhydrophobic surfaces via micropatterning, offering self-cleaning and antifouling properties.
• Current superhydrophobic surfaces are susceptible to wear, limiting their practical applications.
• Developing durable superhydrophobic surfaces is crucial for widespread use.

Purpose of the Study:

• To propose and investigate metal matrix composites (MMCs) as a strategy for creating sustainable superhydrophobic surfaces.
• To develop a model for predicting the wetting behavior of MMCs.
• To experimentally validate the model and assess the superhydrophobicity of MMCs.

Main Methods:

• Modeling the wetting behavior of bulk materials with hydrophobic reinforcement.
• Experimental investigation of graphite-reinforced MMCs.
• Surface characterization of smooth and etched matrix and composite materials to decouple reinforcement and roughness effects.

Main Results:

• Metal matrix composites (MMCs) with hydrophobic reinforcement can achieve superhydrophobicity.
• A model was developed to predict the contact angle of MMCs.
• Experimental data for graphite-reinforced MMCs validated the model's predictions.

Conclusions:

• MMCs offer a sustainable approach to superhydrophobic surfaces, overcoming the wear limitations of traditional methods.
• The proposed model accurately predicts wetting behavior in MMCs.
• This approach enables the design of robust, nonwetting surfaces for demanding applications.