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http://dx.doi.org/10.5764/TCF.2009.21.1.030

A Study on the Super-hydrophobicity of Poly(ethylene terephthalate) Fabric by TiO2 Nano-particles Coating  

Park, Sung-Min (Korea Dyeing Technology Center)
Kwon, Il-Jun (Korea Dyeing Technology Center)
Kim, Ji-Yeon (Korea Dyeing Technology Center)
Kim, Chang-Nam (Korea Dyeing Technology Center)
Yeum, Jeong-Hyun (Dept. of Natural Fiber Science, Kyungpook national university)
Yoon, Nam-Sik (Dept. of Textile System Engineering, Kyungpook national university)
Publication Information
Textile Coloration and Finishing / v.21, no.1, 2009 , pp. 30-37 More about this Journal
Abstract
Studies on plants such as lotus leaf suggested that dual-scale structure could contribute to super-hydrophobicity. We introduced super-hydrophobicity onto poly(ethylene terephthalate)(PET) fabric with dual-scale structure by assembling $TiO_2$ nano sol. PET fabric was treated with $TiO_2$ sol, water-repellent agent using various parameters such as particle size, concentration. Morphological changes by particle size were observed using field emmission scanning electron microscopy(FE-SEM) and AFM measurement, contact angle measurement equipment. The contact angle of water was about 138.5$^{\circ}$, 125.8$^{\circ}$, 125.5$^{\circ}$ and 108.9$^{\circ}$ for PET fabric coated with 60.2nm, 120.1nm, 200nm and 410.5nm $TiO_2$ particles, compared with about 111.5$^{\circ}$ for PET fabric coated with water repellent. When we mixed particle sizes of 60.2nm and 120.1nm by 7:3 volume ratio, the contact angle of water was about 132.5$^{\circ}$. And we mixed particle sizes of 60.2nm and 200nm by 7:3 volume ratio, the contact angle of water was about 141.8$^{\circ}$. Also we mixed particle sizes of 60.2nm and 410.5nm by 7:3 volume ratio, the best super-hydrophobicity was obtained. In this paper, we fabricated various surface structures to the water-repellent surfaces by using four types of $TiO_2$ nano-particles, and we found that the nanoscale structure was very important for the super-hydrophobicity.
Keywords
sol-gel; super-hydrophobic; water repellent; lotus effect; contact angle;
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