Organic Non‐Wettable Superhydrophobic Fullerite Films
Organic Non‐Wettable Superhydrophobic Fullerite Films
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DOI：
10.1002/adma.202102108
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发表时间：
2021-06
影响因子：
29.4
通讯作者：
R. Saran;David W. Fox;L. Zhai;D. Chanda
中科院分区：
文献类型：
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作者：
R. Saran;David W. Fox;L. Zhai;D. Chanda
材料科学中的一个长期探索是开发基于单一有机材料的非湿润超疏水薄膜，而不需要氟化或硅烷处理。在这里，描述了使用富勒石C60和C70纳米晶体胶体凝胶开发的这种薄膜和涂层。结果表明，尽管这些范德华分子晶体具有很高的表面能，但它们的凝胶化作用可以形成具有多尺度粗糙度的自仿射分形表面。富勒石薄膜表面的水滴呈珍珠状，呈Fakir状态，接触角超过150°。这种薄膜具有极强的憎水性和非湿润性；当浸入水中时，即使在两英尺深的水中，它们也能保持干燥长达3小时，并表现出平台效应。通过一系列的实验对这些薄膜上的水滴动力学进行了全面的检测。这些测试包括滚动、反弹、挤压、冷冻、熔化、蒸发；以及酸性和碱性测试。这种材料的非湿膜是独一无二的，因为富勒石瞬间被光敏化，产生极高产量(≈100%)的单线态氧(1O2)，可以杀灭病毒和细菌；从而使它们能够用于流变学、净水和医疗设备。
A long‐standing quest in material science has been the development of non‐wettable superhydrophobic films based on a single organic material, without the requirement of fluorination or silane treatment. Here, such films and coatings, which are developed using colloidal gels of fullerite C60 and C70 nanocrystals, are described. It is illustrated that despite the high surface energy of these van der Waals molecular crystals their gelation can create films having self‐affine fractal surfaces with multiscale roughness. Water droplets on resulting surfaces of fullerite films bead like a pearl resting in a Fakir state with contact angle exceeding 150°. The films are extremely water repellent and non‐wettable; when submerged in water they stay dry up to 3 h even at a water depth of two feet and exhibit the plastron effect. A series of experiments are presented to provide comprehensive inspection of water droplet dynamics on these films. These include rolling, bouncing, squeezing, freezing, melting, evaporating; along with acidic and alkaline tests. Non‐wettable films of such materials are unique as fullerites get photosensitized instantaneously generating extremely high yields (≈100%) of singlet oxygen (1O2) that can destroy viruses and bacteria; thereby enabling their use in rheology, water purification, and medicinal devices.