Halloysite Nanotube
CAS Number: 1332-58-7
Halloysite nanotubes (HNT) are naturally occurring aluminosilicate clay minerals with a distinctive hollow tubular morphology, offering a low-cost, eco-friendly alternative to synthetic nanofillers. The unique lumen structure enables loading of active agents such as corrosion inhibitors, biocides, or flame retardants for controlled release applications. As a reinforcing nanofiller, HNTs significantly improve mechanical properties, thermal stability, and barrier performance in polymer composites and coating systems.
Technical Specifications
| length | 0.5–2 µm |
| appearance | White to off-white powder |
| inner diameter | 10–20 nm |
| outer diameter | 50–70 nm |
Applications
- Controlled-release anticorrosion coatings with encapsulated inhibitors
- Flame-retardant polymer composites
- Reinforcing filler in nylon, epoxy, and polyurethane systems
- Self-healing coating formulations
- Asphalt and bitumen modification for road paving
Key Features
- Natural mineral origin: low cost, abundant supply, and good biocompatibility
- Hollow lumen enables encapsulation of active agents for smart/functional coatings
- Improves thermal stability (HDT) of polymers by up to 20°C
- Enhances flame retardancy when used in synergy with conventional FR systems
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