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Micro/Nanocontainer-Based Self-Healing Coatings for Cultural Heritage Conservation
Wenxuan Chen1, Yutong Liu1, Shanxiang Xu1
1College of Furnishing and Industrial Design, Nanjing Forestry University, Nanjing 210037, China.
Polymers
|May 27, 2026
Summary
Self-healing micro/nanocapsule coatings offer advanced protection for cultural heritage. These intelligent systems autonomously repair damage, ensuring long-term conservation of diverse materials.
Area of Science:
- Materials Science
- Chemistry
- Conservation Science
Background:
- Micro- and nano-container-based self-healing coatings are crucial for preserving cultural heritage artifacts.
- These coatings utilize microcapsules or nanocapsules to deliver healing agents or corrosion inhibitors upon damage.
- Existing methods face challenges in durability and controlled release for diverse materials.
Purpose of the Study:
- To review the advancements in self-healing micro/nanocapsule coatings for cultural heritage conservation.
- To analyze the performance of various capsule systems (e.g., BTA@MSN, PMMA-MA/MgO, clove oil) for different materials (metals, organic artifacts).
- To compare fabrication methods, responsiveness, and sustainability of these advanced coatings.
Main Methods:
- Fabrication techniques such as microfluidics, Pickering emulsions, and multi-core systems were employed.
- Encapsulation efficiencies up to 73.5% and uniform particle sizes were achieved.
- Characterization of pH-responsive release (BTA@MSN), temperature-adaptive rupture (PMMA-MA/MgO), and mechanical property enhancement (clove oil nanocapsules) were performed.
Main Results:
- Benzotriazole@mesoporous silica nanoparticles (BTA@MSN) microcapsules showed pH-responsive release, mitigating corrosion on metallic artifacts.
- Poly(methyl methacrylate-co-methacrylic acid)/MgO (PMMA-MA/MgO) microcapsules enhanced crack repair efficiency by approximately 5%.
- Clove oil nanocapsules significantly improved tensile strength (43.5%) and fracture toughness (101.9%) of organic artifacts with minimal weight loss.
Conclusions:
- Self-healing micro/nanocapsule coatings provide controllable, efficient, and durable active protection for heritage artifacts.
- Hybrid systems offer balanced performance, inorganic nanocontainers provide stability, and polymeric capsules allow rapid healing.
- These coatings represent a shift towards intelligent conservation strategies, enhancing artifact longevity and integrity.
