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Surface Active Agents

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...

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Updated: May 11, 2026

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

Published on: August 15, 2018

Superhydrophobic surfaces engineered using diatomaceous earth.

Nuno M Oliveira¹, Rui L Reis, João F Mano

¹3B's Research Group, Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Caldas das Taipas, Portugal.

ACS Applied Materials & Interfaces

|May 8, 2013

Summary

This summary is machine-generated.

Researchers created superhydrophobic surfaces using diatom exoskeletons, a cheap natural material. This method allows for controllable surface wettability and patterning, with applications on various substrates.

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Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Superhydrophobic surfaces offer unique properties for various applications.
Existing methods for creating superhydrophobic surfaces can be complex or expensive.
Diatoms, a type of algae, possess siliceous exoskeletons that can be utilized as a natural nanomaterial.

Purpose of the Study:

To develop a simple and cost-effective method for preparing superhydrophobic surfaces.
To utilize diatomaceous earth as a primary material for surface fabrication.
To demonstrate controllable wettability and patterning capabilities of the fabricated surfaces.

Main Methods:

Coating glass substrates with diatomaceous earth to create a micro/nanoscale hierarchical topography.
Surface chemical modification via fluorosilanization to achieve superhydrophobicity.
Controlled wettability adjustment using Argon plasma treatment and patterning with hollowed masks.
Surface analysis using X-ray Photoelectron Spectroscopy (XPS).

Main Results:

Successfully prepared superhydrophobic surfaces using diatomaceous earth.
Demonstrated tunable surface wettability through controlled Argon plasma exposure.
Achieved patterned hydrophilic features on superhydrophobic surfaces with defined geometries.
Validated the applicability of the method on various substrates, including thermoplastics.

Conclusions:

Diatomaceous earth is an accessible and effective natural material for fabricating hierarchical micro/nanostructured surfaces.
The proposed fluorosilanization and plasma treatment method allows for controlled superhydrophobicity and patterning.
The strategy shows broad potential for creating functional surfaces on diverse materials.