Superhydrophobicity of natural and artificial surfaces under controlled condensation conditions

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Journal titleACS Applied Materials and Interfaces
Pages12541260; # of pages: 7
SubjectArtificial superhydrophobic surfaces; Artificial surfaces; Binary structures; Condensed water; Dew points; Electron micrograph; Environmental conditions; Equilibrium state; High humidity; Lotus leaf; Low temperatures; Micro/nanostructures; Relative humidities; sliding angle; Solid-liquid; Structured surfaces; Super-hydrophobic surfaces; superhydrophobic; Superhydrophobic behavior; Superhydrophobicity; Surface temperatures; Surface wettability; Temperature differences; Water condensation; Water droplets; Water repellency; Atmospheric humidity; Atmospheric temperature; Biomimetics; Condensation; Contact angle; Humidity control; Surface properties; Hydrophobicity; biomimetic material; article; chemical phenomena; chemistry; electron tomography; humidity; Lotus; plant leaf; surface property; temperature; Biomimetic Materials; Electron Microscope Tomography; Humidity; Hydrophobic and Hydrophilic Interactions; Lotus; Plant Leaves; Surface Properties; Temperature
AbstractIn this paper, we have comparatively investigated the stability of superhydrophobic behaviors of fresh and biomimetic lotus leaf surfaces under controlled water condensation conditions. The binary micro/nano structures of the superhydrophobic surfaces are observed with electron micrographs. Contact and sliding angles are evaluated by syringing water droplets on the substrates with surface temperatures and humidity precisely controlled between -10 and 30 °C, and RH = 10, 30, 60, and 90%. According to the calculations on the solid-liquid contact area fraction in different environmental conditions based on a micro/nano binary structure model, the effects of condensed water on superhydrophobic surfaces are assessed quantitatively. Both the calculated and experimental results indicate that the temperature difference between surface temperature and the dew point during measurement is essential to the occurrence of water condensation while the effect of condensation on the surface wettability also depends on the topology of hierarchical structured surfaces. The loss of water repellency that usually appears on the artificial superhydrophobic surface under low temperature and high humidity conditions is proved to be reversible, showing a bidirectional transition of the equilibrium state between Wenzel and Cassie-Baxter. © 2011 American Chemical Society.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21271344
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Record identifier156c6242-771c-41ab-904b-2af1cd518d03
Record created2014-03-24
Record modified2016-05-09
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