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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

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Superhydrophilic and Superhydrophobic Surfaces with Reversible Wettability Using Laser Processing.

Anustup Chakraborty¹, Mahantesh Khetri¹, Atchutananda Surampudi¹

¹Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, Virginia 22904, United States.

|May 25, 2026

Summary

This study introduces a low-cost laser microtexturing technique for creating surfaces with controllable wettability. The method enables a reversible transition between superhydrophilic and superhydrophobic states, useful for various applications.

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Superhydrophobic Surface by Laser Ablation of PDMS.

Langmuir : the ACS journal of surfaces and colloids·2023

Area of Science:

Materials Science
Surface Engineering
Nanotechnology

Background:

Laser surface microtexturing offers a cost-effective and scalable method for modifying surface properties.
Controlling surface wettability is crucial for applications like self-cleaning, anti-icing, and microfluidics.
Existing methods for reversible superhydrophilic-superhydrophobic surfaces are often complex and expensive.

Purpose of the Study:

To develop a facile and low-cost laser microtexturing method for achieving reversible superhydrophilicity and superhydrophobicity.
To demonstrate the application of this method on transparent glass and aluminum surfaces.
To enable selective patterning of superhydrophilic and superhydrophobic areas.

Main Methods:

Laser surface microtexturing was employed to create specific surface roughness.

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A poly(dimethylsiloxane) (PDMS) coating was applied to induce superhydrophobicity.

Laser ablation was used to remove the PDMS coating, restoring superhydrophilicity.

Main Results:

Achieved superhydrophilicity with a contact angle (CA) < 1°.
Achieved superhydrophobicity with a CA of 169° using a thin PDMS coating.
Demonstrated reversible transition between superhydrophilic and superhydrophobic states by laser ablation of the PDMS layer.

Conclusions:

The developed laser microtexturing method provides a simple, low-cost, and efficient way to create reversible superhydrophilic-superhydrophobic surfaces.
This technique allows for precise control over surface wettability and selective area patterning.
The reversible wettability switching has significant potential for advanced applications in various fields.