Janus Wettability Textile Membrane
topic
Janus textile membranes with asymmetric wettability are fabricated by selectively modifying one face of a woven or nonwoven substrate: hydrophobic face (fluorosilane or PDMS coating, WCA >130°) and hydrophilic face (TiO₂, SiO₂, or plasma O₂ treatment, WCA <20°). Capillary pressure gradient drives unidirectional liquid transport from hydrophobic to hydrophilic face at 0.1–2.0 kPa driving pressure. Moisture transfer rate of 5,000–15,000 g/m²/24h (ASTM E96) in push direction versus 500–1,000 g/m²/24h in reverse, creating 5–15× asymmetric wicking efficiency. Laplace pressure barrier of 2–5 kPa prevents reverse penetration of sweat back to skin during exercise. Janus fabrics increase subjective thermal comfort rating by 25–35% in exercise trials versus conventional moisture-wicking fabrics. Applications in high-performance sportswear, wound exudate management dressings, and water harvesting membranes.
Role
Next-generation moisture management technology that directionally transports sweat away from skin with 10× efficiency advantage over conventional wicking fabrics, improving athletic thermal comfort and wound dressing exudate control through asymmetric nanoscale wettability engineering.