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Fabrication and properties of superhydrophobic $SiO_2$ thin film by sol-gel method  

Kim, Jin-Ho (Korea Institute of Ceramic Engineering and Technology, Glass & Display Team)
Hwang, Jong-Hee (Korea Institute of Ceramic Engineering and Technology, Glass & Display Team)
Lim, Tae-Young (Korea Institute of Ceramic Engineering and Technology, Glass & Display Team)
Kim, Sae-Hoon (Department of Ceramic Engineering, Gangneung-Wonju National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.19, no.6, 2009 , pp. 277-281 More about this Journal
Abstract
Superhydrophobic $SiO_2$ thin films were successfully fabricated on a glass substrate by sol-gel method. To fabricate $SiO_2$ thin film with a high roughness, $SiO_2$ nano particles were added into tetraethoxysilane (TEOS) solution. The prepared $SiO_2$ thin film without an addition of $SiO_2$ nano particles showed a very flat surface with ca. 1.27 nm of root mean square (RMS) roughness. Otherwise, the $SiO_2$ thin films fabricated by using coating solutions added $SiO_2$ nano particles of 1.0, 2.0 and 3.0 wt% showed a RMS roughness of ca. 44.10 nm, ca. 69.58 nm, ca. 80.66 nm, respectively. To modify the surfaces of $SiO_2$ thin films to hydrophobic surface, a hydrophobic treatment was carried out using a fluoroalkyltrimethoxysilane (FAS). The $SiO_2$ thin films with a high rough surface were changed from hydrophilic to hydrophobic surface after the FAS treatment. Especially, the prepared $SiO_2$ thin film with a RMS roughness of 80.66 nm showed a water contact angle of $163^{\circ}$.
Keywords
$SiO_2$; Thin film; Superhydrophobicity; Contact angle; Sol-gel;
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