Biomimetic superhydrophobic and highly oleophobic cotton textiles.
We report a biomimetic procedure to prepare superhydrophobic cotton textiles. By in situ introducing silica particles to cotton fibers to generate a dual-size surface roughness, followed by hydrophobization with polydimethylsiloxane (PDMS), normally hydrophilic cotton has been easily turned superhydrophobic, which exhibits a static water contact angle of 155 degrees for a 10 microL droplet. The roll-off angle of water droplets depends on the droplet volume, ranging from 7 degrees for a droplet of 50 microL to 20 degrees for a 7 microL droplet. When a perfluoroalkyl chain is introduced to the silica particle surface, the superhydrophobic textile also becomes highly oleophobic, as demonstrated by a static contact angle of 140 degrees and a roll-off angle of 24 degrees for a 15 microL sunflower oil droplet.
Hoefnagels
H F
HF
Laboratory of Materials and Interface Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Wu
D
D
de With
G
G
Ming
W
W
D032561:Cotton Fiber; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D018716:Molecular Mimicry; D012828:Silicones / Q000737:chemistry; D013499:Surface Properties; D013784:Textiles
D004129:Dimethylpolysiloxanes; D012828:Silicones; C013830:baysilon