P.K. Dhillon
Topographical Length Scales of Hierarchical Superhydrophobic Surfaces
Dhillon, P.K.; Brown, P.S.; Bain, C.D.; Badyal, J.P.S.; Sarkar, S.
Abstract
The morphology of hydrophobic CF4 plasma fluorinated polybutadiene surfaces has been characterised using atomic force microscopy (AFM). Judicious choice of the plasma power and exposure duration leads to formation of three different surface morphologies (Micro, Nano, and Micro + Nano). Scaling theory analysis shows that for all three surface topographies, there is an initial increase in roughness with length scale followed by a levelling-off to a saturation level. At length scales around 500 nm, it is found that the roughness is very similar for all three types of surfaces, and the saturation roughness value for the Micro + Nano morphology is found to be intermediate between those for the Micro and Nano surfaces. Fast Fourier Transform (FFT) analysis has shown that the Micro + Nano topography comprises a hierarchical superposition of Micro and Nano morphologies. Furthermore, the Micro + Nano surfaces display the highest local roughness (roughness exponent α = 0.42 for length scales shorter than ∼500 nm), which helps to explain their superhydrophobic behaviour (large water contact angle (>170°) and low hysteresis (<1°)).
Citation
Dhillon, P., Brown, P., Bain, C., Badyal, J., & Sarkar, S. (2014). Topographical Length Scales of Hierarchical Superhydrophobic Surfaces. Applied Surface Science, 317, 1068-1074. https://doi.org/10.1016/j.apsusc.2014.08.106
Journal Article Type | Article |
---|---|
Publication Date | Oct 30, 2014 |
Deposit Date | Oct 31, 2014 |
Publicly Available Date | Nov 3, 2014 |
Journal | Applied Surface Science |
Print ISSN | 0169-4332 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 317 |
Pages | 1068-1074 |
DOI | https://doi.org/10.1016/j.apsusc.2014.08.106 |
Keywords | Hydrophobicity, Dynamic scaling theory, Length scales, Roughness. |
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Copyright Statement
NOTICE: this is the author’s version of a work that was accepted for publication in Applied Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Surface Science, 317, 2014, 10.1016/j.apsusc.2014.08.106.
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