Nano-Based UV Protection in Textiles

Nano-based UV protection applies inorganic UV-absorbing nanoparticles (TiO₂ 5–50 nm, ZnO 20–100 nm, CeO₂ 5–20 nm) to textile substrates at 0.5–5.0 g/m² via padding or sol-gel, achieving ultraviolet protection factors (UPF) of 50–500+ per AS/NZS 4399 and EN 13758. TiO₂ absorbs UV-A (315–400 nm) and UV-B (280–315 nm) by electron excitation across 3.0–3.2 eV bandgap, reflecting and scattering residual radiation. ZnO (bandgap 3.37 eV) provides broader UV-A coverage than TiO₂. CeO₂ nanoparticles (bandgap 3.4 eV) offer superior photostability with UV absorption up to 400 nm without photocatalytic degradation of the fabric substrate. Nano UV protection market for outdoor textiles exceeds $580 million, with swimwear, workwear, and outdoor apparel as primary segments.