Quasi-Liquid Surfaces for Sustainable High-Performance Steam Condensation
Quasi-Liquid Surfaces for Sustainable High-Performance Steam Condensation
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DOI：
10.1021/acsami.2c00401
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发表时间：
2022-03-23
影响因子：
9.5
通讯作者：
Dai, Xianming
中科院分区：
文献类型：
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作者：
Monga, Deepak;Guo, Zongqi;Dai, Xianming
可持续的高性能蒸汽冷凝对于减小水和能源系统的尺寸、重量和成本至关重要。众所周知，滴状冷凝可以提供比膜状冷凝显着更高的传热系数。为了通过在超疏水表面上实现非润湿状态和在液体注入表面上实现光滑状态来促进滴状冷凝，人们付出了巨大的努力，但这些表面面临着严峻的耐久性挑战。在这里，我们报告了新开发的耐用准液体表面上可持续的高性能蒸汽滴状冷凝，这些表面可以通过将准液体聚合物分子化学键合在固体基材上轻松制成。结果，固体/水界面转变为准液体/水界面，具有最小的粘附力和非凡的耐用性。具有低至1度的超低接触角滞后的准液体表面的传热系数比传统疏水表面和亲水表面分别高出70%和380%。此外，我们证明了准液体涂层在连续蒸汽冷凝39小时的长时间热通量为420 kW/m(2)时表现出71 kW/(m(2) K)的可持续传热系数。这种准液体表面有潜力维持高性能的蒸汽滴状冷凝，并解决该领域长期存在的耐久性挑战。
Sustainable high-performance steam condensation is critical to reducing the size, weight, and cost of water and energy systems. It is well-known that dropwise condensation can provide a significantly higher heat-transfer coefficient than filmwise condensation. Tremendous efforts have been spent to promote dropwise condensation by achieving a nonwetting state on superhydrophobic surfaces and a slippery state on liquid-infused surfaces, but these surfaces suffer from severe durability challenges. Here, we report sustainable high-performance dropwise condensation of steam on newly developed durable quasi-liquid surfaces, which are easily made by chemically bonding quasi-liquid polymer molecules on solid substrates. As a result, the solid/water interface is changed to a quasi-liquid/water interface with minimal adhesion and extraordinary durability. The quasi-liquid surface with ultralow contact angle hysteresis down to 1 degrees showed a heat-transfer coefficient up to 70 and 380% higher than those on conventional hydrophobic and hydrophilic surfaces, respectively. Furthermore, we demonstrated that the quasi-liquid coating exhibited a sustainable heat-transfer coefficient of 71 kW/(m(2) K) at a heat flux of 420 kW/m(2) under a prolonged period of 39 h in continuous steam condensation. Such a quasi-liquid surface has the potential to sustain high-performance dropwise condensation of steam and address the long-standing durability challenge in the field.