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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

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Published on: August 15, 2018

Drop impact upon micro- and nanostructured superhydrophobic surfaces.

Peichun Tsai¹, Sergio Pacheco, Christophe Pirat

¹Physics of Fluids Group, Faculty of Science and Technology, Impact and MESA.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 14, 2009

Summary

Investigating drop impacts on superhydrophobic surfaces reveals that surface roughness significantly influences splashing at high Weber numbers (We). However, at low We, roughness has minimal effect on impact dynamics.

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Area of Science:

Fluid dynamics
Surface science
Materials science

Background:

Superhydrophobic surfaces offer unique water-repellent properties.
Understanding drop impact dynamics is crucial for various applications, including self-cleaning and anti-icing technologies.

Purpose of the Study:

To experimentally investigate the dynamics of drop impacts on different superhydrophobic surfaces.
To determine the influence of surface roughness and Weber number on impact outcomes.

Main Methods:

Experimental investigation of drop impact dynamics.
Utilized superhydrophobic surfaces with regular polymeric micropatterns and rough carbon nanofibers.
Varied Weber number (We) and surface roughness as control parameters.

Main Results:

At low Weber numbers (We < 120), impact dynamics were similar across different surfaces, showing phenomena like bouncing and air bubble trapping.
At high Weber numbers (We > 120), splashing impacts with satellite droplets increased, especially on rough carbon nanofiber surfaces.
Ambient air pressure had a negligible effect on impact dynamics within the studied parameter range (We < 150).

Conclusions:

Multiscale surface roughness plays a minor role in drop impact dynamics at low Weber numbers but a significant role at high Weber numbers.
Surface roughness is a critical factor in determining splashing behavior during high-speed drop impacts on superhydrophobic surfaces.