Zinc Oxide (ZnO) Antimicrobial Treatments

Zinc oxide nanoparticles (ZnO NPs, 20–100 nm) applied to textiles at 0.5–5.0 g/m² via pad-dry-cure or sol-gel methods provide broad-spectrum antimicrobial activity through three mechanisms: Zn²⁺ ion release (0.1–1.0 ppm), reactive oxygen species (ROS) generation under UV, and direct membrane disruption. Bactericidal reduction exceeds 3 log against S. aureus and E. coli (ISO 20743). UPF value increases to >50 (UV protection factor, AS/NZS 4399) due to ZnO UV absorption at 300–380 nm. Safe for skin contact at loadings below 5 g/m² per Oeko-Tex Standard 100. Wash durability of 20–40 cycles with silane or polyurethane binders. ZnO antimicrobial textile market is valued at $350 million, particularly in sportswear and medical sock sectors.