Directional water-transport fabrics achieved by wettablity gradient from superhydrophobicity to hydrophilicity
Wang, Hongxia, Wang, Xungai and Lin, Tong 2011, Directional water-transport fabrics achieved by wettablity gradient from superhydrophobicity to hydrophilicity, in ATC 2011 : Proceedings of the Asian Textile Conference : Knowledge Convergence in Textiles for Human and Nature, Korean Fiber Society, [Daegu, Korea], pp. 698-703.
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In this study, we demonstrate that fabrics having a wettability gradient from superhydrophobic to hydrophilic through the thickness direction show a novel directional water transfer effect: water can transfer only from the superhydrophobic to the hydrophilic side, but not in the opposite direction unless an external force is applied. A sol-gel technology was used to prepare a superhydrophobic coating on fabrics, and the coated fabrics showed water contact-angle as high as 165°. When the coated fabric was subjected to a photochemistry treatment from one fabric side, the irradiated surface turned hydrophilic permanently, while the back side still maintained the superhydrophobicity. The treated fabric can transfer water droplet rapidly from hydrophobic to hydrophilic side, and the pressure allowing water breakthrough the fabric is different considerably between the two fabric sides. The directional water transfer effect is also affected by the wettability gradient. Such a directional water transfer coating may be useful to develop new functional fabrics for defence applications.
Field of Research
091205 Functional Materials
Socio Economic Objective
860406 Synthetic Fibres, Yarns and Fabrics
HERDC Research category
E2 Full written paper - non-refereed / Abstract reviewed
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