Wetting study of patterned surfaces for superhydrophobicity

Superhydrophobic surfaces have considerable technological potential for various applications due to their extreme water-repellent properties. A number of studies have been carried out to produce artificial biomimetic roughness-induced hydrophobic surfaces. In general, both homogeneous and composite...

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Bibliographic Details
Published in:Ultramicroscopy 2007-10, Vol.107 (10), p.1033-1041
Main Authors: Bhushan, Bharat, Chae Jung, Yong
Format: Article
Language:English
Subjects:
Air pocket
Contact angle
Hydrophobic
Hysteresis
Lotus effect
Tilt angle
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Summary:Superhydrophobic surfaces have considerable technological potential for various applications due to their extreme water-repellent properties. A number of studies have been carried out to produce artificial biomimetic roughness-induced hydrophobic surfaces. In general, both homogeneous and composite interfaces are possible on the produced surface. Silicon surfaces patterned with pillars of two different diameters and heights with varying pitch values were fabricated. We show how static contact angles vary with different pitch values on the patterned silicon surfaces. Based on the experimental data and a numerical model, the trends are explained. We show that superhydrophobic surfaces have low hysteresis and tilt angle. Tribological properties play an important role in many applications requiring water-repellent properties. Therefore, it is important to study the adhesion and friction properties of these surfaces that mimic nature. An atomic/friction force microscope (AFM/FFM) is used for surface characterization and adhesion and friction measurements.
ISSN:0304-3991
1879-2723
DOI:10.1016/j.ultramic.2007.05.002