滑りやすい潤滑剤注入多孔質表面への階層構造の影響

抄録

Condensation phase change and more specifically dropwise condensation have received important attention in the past decades. Aiming to decrease the contact angle hysteresis between the solid surface and the condensate and hence to increase the droplet shedding performance, slippery lubricant infused porous surfaces (SLIPSs) are being proposed. On SLIPSs, a low surface tension oil impregnates the micro- and/or nano-structured features of a superhydrophobic surface (SHS) reducing the direct interactions between the condensate and the solid surface, which effectively decreases the contact angle hysteresis. As a consequence, SLIPSs can achieve better droplet shedding performance with rolling off angles as low as 5 degrees and 2 times greater heat transfer performance than SHSs . In this work, we investigate the presence and absence of micro-structures underneath the condensing droplets on SLIPSs. Here we report the enhanced shedding performance of hierarchical micro-/nano-structured SLIPSs when compared to one tier nano-rough ones, which will have a strong impact on the heat transfer performance.