Sacher, Edward R.
Isimjan, Tayirjan T.
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AbstractSuperhydrophobic surfaces, with water contact angles greater than 150° and slide angles less than 10°, have attracted a great deal of attention due to their self-cleaning ability and excellent water-repellency. It is commonly accepted that a superhydrophobic surface loses its superhydrophobicity in contact with water hotter than 50 °C. Such a phenomenon was recently demonstrated by Liu et al. [J. Mater. Chem., 2009, 19, 5602], using both natural lotus leaf and artificial leaf-like surfaces. However, our work has shown that superhydrophobic surfaces maintained their superhydrophobicity, even in water at 80 °C, provided that the leaf temperature is greater than that of the water droplet. In this paper, we report on the wettability of water droplets on superhydrophobic thin films, as a function of both their temperatures. The results have shown that both the water contact and slide angles on the surfaces will remain unchanged when the temperature of the water droplet is greater than that of the surface. The water contact angle, or the slide angle, will decrease or increase, however, with droplet temperatures increasingly greater than that of the surfaces. We propose that, in such cases, the loss of superhydrophobicity of the surfaces is caused by evaporation of the hot water molecules and their condensation on the cooler surface. © 2014 the Partner Organisations.
SponsorsThe authors express their appreciation to Wuxi City Technology Innovation foundation for support. J.Y.Y. is grateful to Wuxi Shunye Technology for providing support. T.T.I. is grateful for the financial support of the Office of Competitive Research Funds (OCRF) at King Abdullah University of Science and Technology (KAUST), under the "Competitive Research Grant" (CRG) program.
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry A