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Multifunctional thermochromic coating: Colour change and protection combined

Researchers have developed an eco-friendly, superhydrophobic coating with three-stage colour transitions for diverse applications. The robust technology excels in simple fabrication, high stability, and self-cleaning properties.

Superhydrophobic coatings Sustainability
The innovative coating combines colour change and hydrophobicity for smart surfaces and protective materials. Source: admin_design - stock.adobe.com

A new thermochromic coating that visualises temperature changes through a three-stage colour transition has been developed by a Chinese research team. The coating integrates thermochromic microcapsules (TCMs) with nano-silica (SiO₂), fabricated using a simple spray coating method. The colour transitions from green to yellow to red cover a temperature range of 15–35 °C, closely aligning with human thermal perception.

The coating exhibits exceptional water-repellent properties, with a water contact angle (WCA) exceeding 150° and a sliding angle below 3°. After mild abrasion, the WCA increases to over 160°, highlighting its outstanding abrasion resistance. Beyond mechanical stability, the coating demonstrates durability under UV exposure, chemical corrosion, and mechanical impact, making it suitable for long-term applications.

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Versatile applications and environmental benefits

Additionally, the research confirms strong liquid repellency against common liquids such as tea, cola, and milk. Its self-cleaning properties and broad substrate compatibility make the coating practical for smart surfaces, thermal warning systems, and protective industrial materials.

Notably, the coating’s fluorine-free and environmentally friendly composition, combined with straightforward fabrication methods, opens the door to wide industrial adoption. By merging colour-changing capabilities with protective functions and sustainability, this technology sets a new benchmark for multifunctional coatings.

Source: Wang, X., Peng, Y., Wei, X., Liang, Y., & Li, J. Robust multistage thermochromic superhydrophobic coating prepared by a facile one-step spray coating method. Prog. Org. Coat. 210, 109625 (2026).