Superhydrophobicity and Superhydrophilicity of Regular Nanopatterns

Division of Electronics and Electrical Engineering, University of Glasgow, Glasgow, Scotland, United Kingdom
Nano Letters (Impact Factor: 13.59). 11/2005; 5(10):2097-103. DOI: 10.1021/nl051435t
Source: PubMed


The hydrophilicity, hydrophobicity, and sliding behavior of water droplets on nanoasperities of controlled dimensions were investigated experimentally. We show that the "hemi-wicking" theory for hydrophilic SiO(2) samples successfully predicts the experimental advancing angles and that the same patterns, after silanization, become superhydrophobic in agreement with the Cassie-Baxter and Wenzel theories. Our model topographies have the same dimensional scale of some naturally occurring structures that exhibit similar wetting properties. Our results confirm that a forest of hydrophilic/hydrophobic slender pillars is the most effective superwettable/water-repellent configuration. It is shown that the shape and curvature of the edges of the asperities play an important role in determining the advancing angles.

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    • "Email: of surface by self-assembly of organosilane is one of the efficient strategies to synthesize superhydrophobic surface and is achieved due to lowering of the surface energy.[12] [13] [14] The Octadecyltrichlorosilane (ODTS, Cl 3 Si (CH 3 ) 17 ), self-assembled monolayer (SAM) is one such organosilane used for realizing superhydrophobic surfaces[15] [16] and this has been widely investigated on silicon surface, because of its wide range of applications in molecular electronics devices and microfluidics.[17] [18] [19] [20] [21] The superhydrophobicity of silicon surfaces achieved using the chemical texturing followed by chemical modification with depositions of SAM has been reported in literature . "
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