Nanotech 2010

Design and assessment of transparent superhydrophobic glass surface with micro-network of nanopillars

J.-S. Park, J.-H. Noh, H.-E. Lim, W.-D. Kim
Korea Institute of Machinery and Materials, KR

Keywords: superhydrophobic, transparent, micro-network, glass, nanopillars, size-dependent


We have developed the fabrication process of a transparent superhydrophobic glass surface with micro-network of nanopillars using colloidal lithography. The best superhydrophobic sample shows water contact angle 159±3, sliding angle of 3±2, and transparency of 90% compared to bare glass at the range from 600nm to 1000nm. The micro-network samples are fabricated by etching the glass surface using reactive ions with nanosphere mask spun on the surface. The micro-network distribution of nanospheres is formed by controlling the spin rate. After the etching, the nanostructured surfaces are treated with fluoroalkylsilane self-assembled monolayer to get the superhydrophobicity. The network area density is minimized at the spin rate of 4000 rpm, at which the surface shows highest water contact angle and lowest sliding angle compared to the surfaces at other spin rates. To assess the surface at different droplet sizes, the droplet size-dependent contact angle equation is proposed to be used at high contact angle and Bo << 1. Moreover, Furmidge’s sliding angle equation is modified to directly use contact angle to calculate sliding angle. The contact and sliding angles measured from the samples show a good agreement with the proposed equations.
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