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The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

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Scalable and Durable Superhydrophobic Coating Using Shellac-Based Bioadhesive and Hierarchical Silica Nanoparticles.

Ritesh Soni^1,2, Yun-Tae Kim^1,3, Alvo Aabloo²

¹School of Energy and Chemical Engineering, Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 31, 2025

Summary

This study presents a simple, eco-friendly spray-coating method for durable superhydrophobic surfaces using shellac and modified silica nanoparticles. The resulting coatings offer excellent water repellency and stability across diverse applications.

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Area of Science:

Materials Science
Surface Chemistry

Background:

Superhydrophobic coatings offer significant benefits but are often hindered by complexity, cost, and poor durability.
Existing methods struggle with mechanical, thermal, and environmental stability, limiting widespread adoption.

Purpose of the Study:

To develop a simple, scalable, eco-friendly, and durable superhydrophobic coating.
To investigate the efficacy of bioadhesive shellac and octadecyltrichlorosilane (OTS)-modified silica nanoparticles for creating robust superhydrophobic surfaces.

Main Methods:

A spray-coating technique was employed using bioadhesive shellac and OTS-modified silica nanoparticles.
The method focused on creating hierarchical micro/nanostructures for enhanced superhydrophobicity and adhesion.

Main Results:

The developed coating achieved a contact angle of 162.1° and a sliding angle of 4°, demonstrating excellent superhydrophobicity.
The superhydrophobic properties were retained after abrasion, heat exposure (150 °C), and acidic conditions (pH ~4.2).
The coating adhered strongly to various substrates including nonwoven polypropylene, glass, plastic, metal, wood, cotton, and concrete.

Conclusions:

The study successfully demonstrated a simple, scalable, and eco-friendly method for producing durable superhydrophobic surfaces.
The biocompatible and robust nature of these coatings makes them suitable for critical applications in antifouling, food packaging, and biomedical fields.