Liquid-Infused Nanostructured Surfaces with Extreme Anti-Ice and Anti-Frost Performance
Liquid-Infused Nanostructured Surfaces with Extreme Anti-Ice and Anti-Frost Performance
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DOI：
10.1021/nn302310q
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发表时间：
2012-08-01
期刊：
影响因子：
17.1
通讯作者：
Aizenberg, Joanna
中科院分区：
文献类型：
--
作者：
Kim, Philseok;Wong, Tak-Sing;Aizenberg, Joanna
在许多基础设施、交通运输和冷却系统中，防冰涂料可以对全球节能和提高安全性产生重大影响。近年来，人们主要致力于利用荷叶激发的超疏水表面来开发憎冰表面，然而这些表面在高湿度条件下由于水的凝结和霜层的形成而失效，甚至由于较大的表面积而导致冰的粘附性增加。我们报道了一种完全不同类型的拒冰材料，这种材料基于光滑的、注入液体的多孔表面(SLIP)，其中稳定、超光滑、低滞后的润滑剂覆盖层是通过向纳米结构表面注入不溶于水的液体来保持的，纳米结构表面经过化学功能化处理，对渗透的液体具有高亲和力并将其锁定到位。我们开发了一种在工业相关金属上直接制造卡瓦的方法，特别是铝，这是最广泛使用的轻质结构材料之一。我们证明，涂有滑板的铝表面不仅通过有效地去除凝结的水分来抑制冰/霜的凝结，而且表现出比最先进的材料至少低一个数量级的冰粘附性。在理论分析和大量结冰/除冰实验的基础上，我们讨论了卡瓦作为防冰表面的特殊优势：由于极低的接触角滞后，大大减小了滑动液滴的尺寸。我们表明，我们的表面基本上保持无霜，任何传统材料都会在其中积累冰。这些结果表明，在广泛的应用领域，如制冷、航空、屋顶、电线、户外标志、栏杆和风力涡轮机，SLIP是一种很有前途的防冰材料。
Ice-repellent coatings can have significant impact on global energy savings and improving safety in many infrastructures, transportation, and cooling systems. Recent efforts for developing ice-phobic surfaces have been mostly devoted to utilizing lotus-leaf-inspired superhy-drophobic surfaces, yet these surfaces fail in high-humidity conditions due to water condensation and frost formation and even lead to increased ice adhesion due to a large surface area. We report a radically different type of ice-repellent material based on slippery, liquid-infused porous surfaces (SLIPS), where a stable, ultrasmooth, low-hysteresis lubricant overlayer is maintained by infusing a water-immiscible liquid into a nanostructured surface chemically functionalized to have a high affinity to the infiltrated liquid and lock it in place. We develop a direct fabrication method of SLIPS on industrially relevant metals, particularly aluminum, one of the most widely used lightweight structural materials. We demonstrate that SLIPS-coated Al surfaces not only suppress ice/frost accretion by effectively removing condensed moisture but also exhibit at least an order of magnitude lower ice adhesion than state-of-the-art materials. On the basis of a theoretical analysis followed by extensive icing/deicing experiments, we discuss special advantages of SLIPS as ice-repellent surfaces: highly reduced sliding droplet sizes resulting from the extremely low contact angle hysteresis. We show that our surfaces remain essentially frost-free in which any conventional materials accumulate ice. These results indicate that SLIPS is a promising candidate for developing robust anti-icing materials for broad applications, such as refrigeration, aviation, roofs, wires, outdoor signs, railings, and wind turbines.