Journal
LANGMUIR
Volume 25, Issue 21, Pages 12444-12448Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la902882b
Keywords
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Funding
- National Science Foundation [0626045]
- University of Pittsburgh Mascaro Sustainability Innovation Center
- U.S. Department of Energy [DE-FG02-06ER46296]
- National Energy Research Scientific Computing Center (NERSC) [DE-AC03-76SF0009]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0626045] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1000322] Funding Source: National Science Foundation
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We use nanoparticle-polymer composites to demonstrate the anti-icing capability of superhydrophobic surfaces and report direct experimental evidence that such surfaces are able to prevent ice formation upon impact of supercooled water both in laboratory conditions and in natural environments. We rind that the anti-icing capability of these composites depends not only on their superhydrophobicity but also on the size of the particles exposed on the surface. The critical particle sizes that determine the superhydrophobicity and the anti-icing property are in two different length scales, The effect of particle size on ice formation is explained by using a classical heterogeneous nucleation theory. This result implies that the anti-icing property of a surface is not directly correlated with the superhydrophobicity, and thus, it is uncertain whether a superhydrophobic surface is anti-icing without detailed knowledge of the surface morphology, The result also opens up possibilities for rational design of anti-icing superhydrophobic surfaces by tuning surface textures in multiple length scales.
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