Future Industries Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia.
Laser Physics and Photonic Devices Laboratories, University of South Australia , Mawson Lakes, South Australia 5095, Australia.
ACS Nano. 2016 Jan 26;10(1):1076-85. doi: 10.1021/acsnano.5b06404. Epub 2016 Jan 8.
Herein we report a simple and substrate-independent approach to fabricate transparent oil-repellent coatings, which involves alternate deposition of poly(diallyldimethylammonium) (PDDA) and poly(styrenesulfonate) (PSS) onto substrates, followed by incubation of the coated objects into perfluorooctanoate (PFO) aqueous solutions for 2 min. Various low-surface-tension liquids can easily slide down the coating surfaces on flat substrates at a sliding angle lower than 12° for 10 μL droplets. The coatings are applicable to different substrates including Si, glass, plastic, steel, and wood, and those with complex shapes and large surface areas. They are also applicable to rough substrates with roughness at both micro/nanoscale and macroscopic scales to realize the easy-sliding oil repellency. Incubation of the PDDA/PSS polyelectrolyte multilayers (PEMs) into PFO solutions induces an effective but nondestructive substitution of PFO anions for PSS in the PEMs, which results in a composite coating with PFO anions homogeneously interspersed in both the coating surface and the bulk. Thanks to the as-described "repeating-layer" composition/structure of the coatings, their easy-sliding oil repellency can be self-healed after surface decomposition or well maintained after physical damages, due to the replenishing surface. Therefore, the advantageous characteristics of the as-developed oil-repellent coatings and the simplicity of the preparation protocol make the coatings highly practical for real-world applications. It is believed that the coatings can perform as antismudge coatings that shield against oil-borne contaminants, chemical-shield coatings that protect coated plastics from dissolution by organic solvents, and nonstick coatings (of oil tankers or pipelines) that enable loss-free oil transportation.
在此，我们报告了一种简单且基底独立的方法来制备透明的疏油涂层，该方法涉及将聚二烯丙基二甲基氯化铵（PDDA）和聚苯乙烯磺酸盐（PSS）交替沉积在基底上，然后将涂覆的物体浸泡在全氟辛酸（PFO）水溶液中 2 分钟。在 10 μL 液滴的情况下，各种低表面张力的液体可以很容易地在平板基底上从涂层表面滑落，滑动角低于 12°。该涂层适用于不同的基底，包括硅、玻璃、塑料、钢和木材，以及具有复杂形状和大表面积的基底。它们也适用于具有微观/纳米级和宏观级粗糙度的粗糙基底，以实现易于滑动的疏油性能。将 PDDA/PSS 聚电解质多层（PEM）浸泡在 PFO 溶液中会导致 PFO 阴离子有效地但非破坏性地替代 PEM 中的 PSS，从而在涂层表面和内部均匀地掺杂 PFO 阴离子的复合涂层。由于所描述的“重复层”组成/结构，涂层的易于滑动的疏油性能在表面分解后可以自我修复，在物理损坏后也可以很好地保持，这要归功于表面的补充。因此，所开发的疏油涂层的优势特性和制备方案的简单性使得这些涂层在实际应用中具有很高的实用性。人们相信，这些涂层可以用作防油污染的防污涂层、防止有机溶剂溶解的化学防护涂层以及无粘性涂层（如油轮或管道），从而实现无损耗的石油运输。
