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Pillars or Pancakes? Self-Cleaning Surfaces without Coating
Nano Letters ( IF 9.6 ) Pub Date : 2018-10-26 00:00:00 , DOI: 10.1021/acs.nanolett.8b02982 Naureen Akhtar 1, 2 , Peter J. Thomas 3 , Benny Svardal 3 , Stian Almenningen 1 , Edwin de Jong 2 , Stian Magnussen 4 , Patrick R. Onck 2 , Martin A. Fernø 1 , Bodil Holst 1
Nano Letters ( IF 9.6 ) Pub Date : 2018-10-26 00:00:00 , DOI: 10.1021/acs.nanolett.8b02982 Naureen Akhtar 1, 2 , Peter J. Thomas 3 , Benny Svardal 3 , Stian Almenningen 1 , Edwin de Jong 2 , Stian Magnussen 4 , Patrick R. Onck 2 , Martin A. Fernø 1 , Bodil Holst 1
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Surfaces that stay clean when immersed in water are important for an enormous range of applications from ships and buildings to marine, medical, and other equipment. Up until now the main strategy for designing self-cleaning surfaces has been to combine hydrophilic/hydrophobic coatings with a high aspect ratio structuring (typically micron scale pillars) to trap a (semi)static water/air layer for drag and adhesion reduction. However, such coating and structuring can distort optical properties and get damaged in harsh environments, and contamination, i.e., particles, oil droplets, and biofouling, can get trapped and aggregate in the structure. Here we present a radically different strategy for self-cleaning surface design: We show that a surface can be made self-cleaning by structuring with a pattern of very low aspect ratio pillars (“pancakes”). Now the water is not trapped. It can flow freely around the pancakes thus creating a dynamic water layer. We have applied the new pancake design to sapphire windows and made the first surfaces that are self-cleaning through structuring alone without the application of any coating. An offshore installation has now been running continuously with structured windows for more than one year. The previous uptime for unstructured windows was 7 days.
中文翻译：
支柱还是薄煎饼？自洁表面，无涂层
浸入水中时保持清洁的表面对于从船舶和建筑物到船舶，医疗和其他设备的广泛应用非常重要。到目前为止，设计自清洁表面的主要策略是将亲水性/疏水性涂层与高纵横比结构（通常是微米级的支柱）结合起来，以捕集（半）静态的水/空气层，以减少阻力和附着力。但是，这样的涂层和结构化会扭曲光学特性并在恶劣的环境中受损，并且污染物（例如，颗粒，油滴和生物污垢）会被捕获并聚集在结构中。在这里，我们提出了一种用于自清洁表面设计的截然不同的策略：我们展示了可以通过使用纵横比非常低的支柱（“薄煎饼”）进行结构化来对表面进行自清洁。现在没有水被困住了。它可以在薄煎饼周围自由流动，从而形成动态的水层。我们已经将新的煎饼设计应用于蓝宝石窗户，并通过结构单独制作了第一批可自动清洁的表面，而无需施加任何涂层。现在，海上安装的结构化窗户已经连续运行了一年多。以前非结构化窗口的正常运行时间为7天。
更新日期：2018-10-26
中文翻译：
支柱还是薄煎饼？自洁表面，无涂层
浸入水中时保持清洁的表面对于从船舶和建筑物到船舶，医疗和其他设备的广泛应用非常重要。到目前为止，设计自清洁表面的主要策略是将亲水性/疏水性涂层与高纵横比结构（通常是微米级的支柱）结合起来，以捕集（半）静态的水/空气层，以减少阻力和附着力。但是，这样的涂层和结构化会扭曲光学特性并在恶劣的环境中受损，并且污染物（例如，颗粒，油滴和生物污垢）会被捕获并聚集在结构中。在这里，我们提出了一种用于自清洁表面设计的截然不同的策略：我们展示了可以通过使用纵横比非常低的支柱（“薄煎饼”）进行结构化来对表面进行自清洁。现在没有水被困住了。它可以在薄煎饼周围自由流动，从而形成动态的水层。我们已经将新的煎饼设计应用于蓝宝石窗户，并通过结构单独制作了第一批可自动清洁的表面，而无需施加任何涂层。现在，海上安装的结构化窗户已经连续运行了一年多。以前非结构化窗口的正常运行时间为7天。
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