Impact of Picoliter Droplets on Superhydrophobic Surfaces with Ultralow Spreading Ratios

The impact of picoliter-sized water droplets on superhydrophobic CF4 plasma fluorinated polybutadiene surfaces is investigated with high-speed imaging. Variation of the surface topography by plasmachemical modification enables the dynamics of wetting to be precisely controlled. Final spreading ratio...

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Bibliographic Details
Published inLangmuir Vol. 27; no. 22; pp. 13897 - 13903
Main Authors Brown, P. S, Berson, A, Talbot, E. L, Wood, T. J, Schofield, W. C. E, Bain, C. D, Badyal, J. P. S
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 15.11.2011
Subjects
Chemistry
Exact sciences and technology
General and physical chemistry
Materials: Nano-and Mesostructured Materials, Polymers, Gels, Liquid Crystals, Composites
Solid-liquid interface
Surface physical chemistry
Water
Modification
Plasma
Wetting
Fluorine compound
Droplet
Dynamics
Spreading
Imaging
Topography
High speed
Oscillation
Frequency
Models
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Summary:The impact of picoliter-sized water droplets on superhydrophobic CF4 plasma fluorinated polybutadiene surfaces is investigated with high-speed imaging. Variation of the surface topography by plasmachemical modification enables the dynamics of wetting to be precisely controlled. Final spreading ratios as low as 0.63 can be achieved. A comparison of the maximum spreading ratio and droplet oscillation frequencies to models described in the literature shows that both are found to be much lower than theoretically predicted.
ISSN:0743-7463
1520-5827
DOI:10.1021/la203329n