Nano Archive

Hierarchical silicon etched structures for controlled hydrophobicity/superhydrophobicity

Xiu, Yonghao and Zhu, Lingbo and Hess, Dennis W. and Wong, C. P. (2007) Hierarchical silicon etched structures for controlled hydrophobicity/superhydrophobicity. NANO LETTERS, 7 (11). pp. 3388-3393.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl0717457

Abstract

Silicon surface hydrophobicity has been varied by using silane treatments on silicon pyramid surfaces generated by KOH anisotropic etching. Results demonstrated that by altering the surface hydrophobicity, the apparent contact angle changed in accord with the Wenzel equation for surface structures with inclined side walls. Hierarchical structures were also constructed from Si pyramids where nanostructures were added by Au-assisted electroless HF/H2O2 etching. Surface hydrophobicity and superhydrophobicity were achieved by surface modification with a variety of silanes. Stability of the Cassie state of superhydrophobicity is described with respect to the Laplace pressure as indicated by the water droplet meniscus in contact with the hierarchical structures. The contact angle hysteresis observed is also discussed with respect to water/substrate adhesion.

Item Type:Article
Uncontrolled Keywords:ROUGH SURFACES; SUPERHYDROPHOBIC STATES; POROUS SILICON; TRANSITION; LIQUID; LOTUS
Subjects:Material Science > Nanofabrication processes and tools
ID Code:6210
Deposited By:IoN
Deposited On:08 Sep 2009 12:22
Last Modified:08 Sep 2009 12:22

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