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FAQ: Self-Healing Transparent Coating with Antibacterial Properties
TL;DR
This transparent coating gives devices a competitive edge by self-repairing scratches and preventing bacterial growth, reducing maintenance costs and extending product lifespan.
Dynamic selenonium salts in polyurethane enable self-healing when heated and antibacterial action through contact-killing, maintaining transparency and function after recycling or seawater immersion.
This coating makes the world better by reducing waste through recyclability and preventing infections on medical devices and public surfaces, promoting health and sustainability.
A transparent coating acts like living skin, healing scratches in minutes under heat while killing bacteria, ideal for phone screens and marine sensors.
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The content describes a transparent polyurethane coating that uses dynamic selenonium salts to both self-heal scratches when heated and prevent bacterial growth, while maintaining high transparency and durability.
Most self-healing films either work only once (like microcapsule-based ones), sacrifice transparency, or lack antibacterial capability. This coating combines transparency, healability, antibacterial function, and reprocessability in a single material, which has been difficult to achieve.
The dynamic selenonium chemistry allows polymer chains to rearrange under heat. When scratched, the coating can heal visibly within 1 hour at 140°C, and with slight pressure, recovery time shortens to approximately 20 minutes.
The selenonium-containing samples disrupt bacterial cell membranes through a contact-killing mechanism, as shown by SEM images of ruptured membranes. High-loading versions nearly eliminated E. coli and S. aureus colonies in tests.
The coating has 90-91% light transmittance (comparable to bare glass), pencil hardness of 1H, and adhesion rated 4B-5B. It maintains transparency after seawater immersion with minimal swelling and preserves structure after recycling.
A team from Jiangsu University of Technology, Soochow University, and Ghent University reported their findings on October 11, 2025, in the Chinese Journal of Polymer Science (DOI: 10.1007/s10118-025-3414-7).
The coating could benefit phone screens, marine sensors, marine windows, cars, ships, electronics, public-touch surfaces, and medical settings—anywhere devices face daily wear, moisture, and microbial contamination.
The coating maintains transparency, structure, and antibacterial function even after seawater immersion and multiple recycling cycles, demonstrating its suitability for harsh environments and sustainable material design.
The coating resists bacteria through a contact-killing mechanism without leaching chemicals, which is particularly important for marine environments and medical settings where chemical leaching is undesirable.
Curated from 24-7 Press Release
