Issue 27, 2014

How to repel hot water from a superhydrophobic surface?

Abstract

Superhydrophobic 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.

Graphical abstract: How to repel hot water from a superhydrophobic surface?

Supplementary files

Article information

Article type
Paper
Submitted
20 Feb 2014
Accepted
30 Apr 2014
First published
07 May 2014

J. Mater. Chem. A, 2014,2, 10639-10646

Author version available

How to repel hot water from a superhydrophobic surface?

Z. Yu, J. Yang, F. Wan, Q. Ge, L. Yang, Z. Ding, D. Yang, E. Sacher and T. T. Isimjan, J. Mater. Chem. A, 2014, 2, 10639 DOI: 10.1039/C4TA00882K

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