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    Water condensation on superhydrophobic aluminum surfaces with different low-surface-energy coatings

    Year: 2011

    Journal: Applied surface science 2012 258 (8) pp 4063-4068, 20121211

    Authors: Long Yin, Yuanyi Wang, Jianfu Ding, Qingjun Wang, Qingmin Chen

    Organizations: Polymer Science and Engineering Department, School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, Jiangsu 210093, China; Institute for Chemical Process and Environmental Technology, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada

    In this work, we have fabricated superhydrophobic aluminum surfaces by a facile chemical etching method. Surface morphology and composition were studied by using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). To comparatively investigate the effect of environmental factors on superhydrophobic behaviors of surfaces with different low-surface-energy coatings under controllable condensation conditions, contact and sliding angles were measured from -10 °C to 30 °C under relative humidity (RH) of 30, 60 and 90%, respectively. The calculation of the solid–liquid contact area fraction quantitatively explained the increased wettability characterized by descending contact angle and ascending sliding angle under low temperature and high humidity, and indicated a transition of the equilibrium state from Cassie–Baxter to Wenzel on rough surfaces. The wettability restoration test showed that the loss of superhydrophobicity during condensation could be recovered completely after a drying process at room temperature.