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In relation to this article, we declare that there is no conflict of interest.
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Received January 2, 2013
Accepted February 24, 2013
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Fabrication of superhydrophobic surfaces using structured colloids

Department of Chemical Engineering and Biotechnology, Korea Polytechnic University, 237, Siheung-si, Gyeonggi-do 429-793, Korea 1Division of Powder and Ceramics, Korea Institute of Materials Science, 66, Sangnam-dong, Changwon, Gyeongnam 641-831, Korea 2Materials Processing Division, Korea Institute of Materials Science, 66, Sangnam-dong, Changwon, Gyeongnam 641-831, Korea 3Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea
Korean Journal of Chemical Engineering, May 2013, 30(5), 1142-1152(11), 10.1007/s11814-013-0031-x
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Abstract

We have introduced water-in-oil emulsion systems to generate confining geometries for the self-organization of monodisperse silica nanospheres as building block particles. Then, through the slow evaporation of emulsion phases by heating, these nanospheres were packed into structural colloids such as raspberry-shaped micro-particles. The suspension of colloidal clusters was deposited onto glass substrate followed by surface modification of fluorinecontaining silane coupling agent to produce superhydrophobic surface with dual scale roughness. Similar self-assembly approach was employed to fabricate macroporous micro-particles from composite micro-particles of polystyrene microspheres and antimony-doped tin oxide nanoparticles by calcination. After deposition of the porous particles and fluorine treatment with silane coupling agent, superhydrophobic surfaces which have potential applications such as self cleaning property could be obtained with contact angle of water larger than 150℃.

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