用于高性能滴状冷凝的超薄润滑剂注入垂直石墨烯纳米支架
Ultra-Thin Lubricant-Infused Vertical Graphene Nanoscaffolds for High-Performance Dropwise Condensation
摘要：
润滑剂注入表面（LIS）在排斥水方面是高效的，并且构成用于在广泛的能源应用中发生的冷凝过程的非常有前途的材料家族。然而，LIS在这些过程中的性能受到润滑剂和支撑表面结构的厚度所施加的固有热阻以及润滑剂随时间的逐渐耗尽的限制。在这里，我们提出了一个显着的，超薄（~70 nm）和导电LIS架构，通过注入润滑剂到铜上垂直生长的石墨烯纳米支架。支架的超薄性质，结合石墨烯的高面内热导率，大大减少了早期的限制，与最先进的CuO LIS表面相比，有效地使传热性能加倍。我们表明，LIS表面的热传递性能的热阻的效果，虽然经常被忽视，可以是如此有害，一个简单的纳米结构的CuO表面可以胜过CuO LIS表面，尽管膜冷凝在前者。还发现本发明的垂直石墨烯LIS对润滑剂耗尽具有抗性，保持稳定的滴状冷凝至少~7小时，而前进接触角和接触角滞后没有显著变化。垂直石墨烯LIS消耗的润滑剂比现有最先进的CuO LIS少52.6%，也使制造过程更经济。
英文摘要：
Lubricant-infused surfaces (LIS) are highly efficient in repelling water and constitute a very promising family of materials for condensation processes occurring in a broad range of energy applications. However, the performance of LIS in such processes is limited by the inherent thermal resistance imposed by the thickness of the lubricant and supporting surface structure, as well as by the gradual depletion of the lubricant over time. Here we present a remarkable, ultra-thin (~70 nm) and conductive LIS architecture, obtained by infusing lubricant into a vertically grown graphene nanoscaffold on copper. The ultra-thin nature of the scaffold, combined with the high in-plane thermal conductivity of graphene, drastically minimize earlier limitations, effectively doubling the heat transfer performance compared to a state-of-the-art CuO LIS surface. We show that the effect of the thermal resistance to the heat transfer performance of a LIS surface, although often overlooked, can be so detrimental that a simple nanostructured CuO surface can outperform a CuO LIS surface, despite film condensation on the former. The present vertical graphene LIS is also found to be resistant to lubricant depletion, maintaining stable dropwise condensation for at least ~7 hours with no significant change of advancing contact angle and contact angle hysteresis. The lubricant consumed by the vertical graphene LIS is 52.6% less than the existing state-of-the-art CuO LIS, making also the fabrication process more economical.
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