Superhydrophobicity and superhydrophilicity of regular nanopatterns

Martines, E., Seunarine, K., Morgan, H., Gadegaard, N., Wilkinson, C. and Riehle, M.O. (2005) Superhydrophobicity and superhydrophilicity of regular nanopatterns. Nano Letters, 5, pp. 2097-2103. (doi: 10.1021/n1051435t)

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Abstract

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<sub>2</sub> 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Riehle, Dr Mathis
Authors: Martines, E., Seunarine, K., Morgan, H., Gadegaard, N., Wilkinson, C., and Riehle, M.O.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Nano Letters
Publisher:American Chemical Society
ISSN:1530-6984
ISSN (Online):1530-6992

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