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

Wang, Hongxia, Wang, Xungai and Lin, Tong 2013, Unidirectional water transfer effect from fabrics having a superhydrophobic-to-hydophilic gradient, Journal of nanoscience and nanotechnology, vol. 13, no. 2, pp. 839-842.

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Title Unidirectional water transfer effect from fabrics having a superhydrophobic-to-hydophilic gradient
Author(s) Wang, Hongxia
Wang, Xungai
Lin, Tong
Journal name Journal of nanoscience and nanotechnology
Volume number 13
Issue number 2
Start page 839
End page 842
Total pages 4
Publisher American Scientific Publishers
Place of publication Valencia, Calif.
Publication date 2013
ISSN 1533-4880
1533-4899
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
091209 Polymers and Plastics
Socio Economic Objective 860406 Synthetic Fibres, Yarns and Fabrics
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2013, American Scientific Publishers
Persistent URL http://hdl.handle.net/10536/DRO/DU:30053650

Document type: Journal Article
Collection: Institute for Frontier Materials
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