Superhydrophobicity on the non-woven fabric using plasma etching and hydrophobic coating

Superhydrophobicity on the non-woven fabric using plasma etching and hydrophobic coating
Hydrophobicity; hairy; non-woven fabric (NWF); pet; nanopattern; superhydrophobic; oxygen plasma; HMDSO
Issue Date
International Symposium on Nature Inspired Technology(ISNIT2010)
Non-woven fabric (NWF) has been used for oil absorber or water repellent surfaces in many applications such as gas diffusion layer in polymer electrolyte membrane fuel cell or textiles. In this work, superhydrophobic surface on the NWF was fabricated by surface nano-structuring using 13.56 MHz radio frequency-plasma enhanced chemical vapor deposition (rf-PECVD) technique. O2 plasma treatment was found to develop pillar- or hairly-like structures (shown in Fig. 1) with a polyehyleneterephtalate (PET) due to high etching rate of the noncrystalline cluster in PET while low etching sensitivity against the crystalline cluster of PET. It was measured that the hairy-like structure has the high aspect ratio with diameter of ~30 nm and height of ~500 nm on NWF threads of 20-50 micron in diameter as the plasma treatment duration was varied from 1 to 60 min at a bias voltage of -400 V. Then hydrophobic coating of a-C:H:Si:O film was deposited at a bias voltage of -400 V, improving the wetting angle from 100 on the pristine NWF to more than 140 degree on the hydrophobic film coated NWF substrate. Furthermore the NWF having nanopillar or hairy structures coated with a-C:H:Si:O film improves its hydrophobicity up to 160° and contact angle hysteresis decreased dramatically of below 5°.
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