Unidirectional water transfer effect from fabrics having a superhydrophobic-to-hydrophillic gradient

Wang, Hongxia, Wang, Xungai and Lin, Tong 2011, Unidirectional water transfer effect from fabrics having a superhydrophobic-to-hydrophillic gradient, in ChinaNANO 2011 : International Conference on Nanoscience and Technology : Book of abstracts, -,, pp. 84-84.

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Title Unidirectional water transfer effect from fabrics having a superhydrophobic-to-hydrophillic gradient
Author(s) Wang, Hongxia
Wang, Xungai
Lin, Tong
Conference name International Conference on Nanoscience and Technology (2011 : Beijing, China)
Conference location Beijing, China
Conference dates 7-9 Sept. 2011
Title of proceedings ChinaNANO 2011 : International Conference on Nanoscience and Technology : Book of abstracts
Editor(s) [Unknown]
Publication date 2011
Conference series International Conference on Nanoscience and Technology
Start page 84
End page 84
Publisher -
Keyword(s) superhydrophobicity
hydrophilicity
directional water-transfer
coating
Summary 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 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 nano-structured superhydrophobic coating on fabrics, and the coated fabrics showed water contact-angle as high as 165 degrees. 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 are different considerably between the two fabric sides. The directional water transfer effect is affected by the wettability gradient. Such a directional water transfer coating may be useful to develop new functional fabrics for defence applications.
Language eng
Field of Research 091205 Functional Materials
Socio Economic Objective 860406 Synthetic Fibres, Yarns and Fabrics
HERDC Research category E3 Extract of paper
Persistent URL http://hdl.handle.net/10536/DRO/DU:30042300

Document type: Conference Paper
Collection: Centre for Material and Fibre Innovation
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