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초록·키워드
On superhydrophobic (SHPo) surfaces, either of two wetting states ?the Cassie state (i.e., non-wetted state) and the Wenzel state (i.e., wetted state) ? can be observed depending on the thermodynamic energy of each state and experimental conditions. Each wetting state leads to quite a distinctive dynamic characteristic of the liquid drop on SHPo surfaces and it has been of primary interest to understand or induce the desirable wetting state for relevant thermofluid engineering applications. In this study, we investigate how the wetting state of microstructured SHPo surfaces influences water harvesting performance of the SHPo surface via dewing by testing two different surface patterns of posts and grates with varying structural parameters. On grates, the observed wetting state during condensation is well described by the thermodynamic energy criteria and it is seen that the Cassie state is associated with the faster removal of smaller droplets due to the higher drop mobility compared with the Wenzel state. Meanwhile, on posts, the observed wetting state is dominantly the Wenzel state regardless of the thermodynamic energy of each state, and due to much larger pinning force of the Wenzel state the condensates are shed slowly only after they grow to a sufficiently large size. Based on a simple modeling, we attribute this difference in the droplet shedding characteristics to the different dynamic pathway from the Wenzel state to the Cassie state between posts and grates. Overall, the faster drop removal on the SHPo surface helps enhance the water harvesting performance of the SHPo surfaces by facilitating the condensation on the droplet-free area, as manifested by the best water harvesting performance of gratings on the Cassie state amongst the tested surfaces.
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