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Stereolithography of perfluoropolyethers for the microfabrication of robust omniphobic surfaces

机译：全氟聚醚的立体光刻技术，用于制造坚固的全疏表面

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摘要

In this work, we provide a simple and straightforward method for the fabrication of stable highly hydrophobic and oleophobic surfaces by applying stereolithography (SL) to perfluoropolyethers (PFPEs). Inspired by the liquid repellency widely shown in nature, our approach enables to easily mimic the interplay between the chemistry and physics by microtexturing low surface tension PFPEs. To this end, UV-curable resins suitable for SL-processing were formulated by blending multifunctional (meth)acrylates PFPEs oligomers with photoinitiator and visible dyes whose content was tuned to tailor resin SL sensitivities. Photocalorimetric studies were also performed to investigate the curing behavior of the different formulations upon SL light exposure. Being the first example of stereolithography applied to PFPEs, stereolithographic processability of new developed PFPEs photopolymer was compared with a standard photoresist taken as benchmark (DL260 (R)). Optimized formulations were characterized by reduced laser penetration depth (<75 mu m) and small critical energies thus enabling for fast printing of micrometric structures. Arrays of cylindrical pillars (85 pm diameter, 400 mu m height) characterized by varied pillars spacing (200 divided by 350 mu m) were rapidly printed with high fidelity as attested by SEM examination. Contact angle measurements in static and dynamic conditions were performed to investigate the surface properties of textured samples using water and oil as the probing liquids. PFPEs liquid repellent performances were compared with those from DL260 (R) textured surfaces arrayed by SL. High water contact angles coupled with low hysteresis asserted that high hydrophobic surfaces were successfully obtained and best-performing textured surfaces were also characterized by high oil repellency. Finally, this study demonstrated that omniphobic surfaces can be easily realized via a single-step, cost-effective, and time-saving process. (C) 2017 Elsevier B.V. All rights reserved.
机译：在这项工作中，我们通过将立体光刻（SL）应用于全氟聚醚（PFPE），为稳定的高疏水性和疏油性表面的制备提供了一种简单直接的方法。受自然界广泛展示的拒液性启发，我们的方法通过对低表面张力的PFPE进行微纹理化，可以轻松模拟化学和物理之间的相互作用。为此，通过将多官能（甲基）丙烯酸酯PFPEs低聚物与光引发剂和可见染料掺混来配制适合SL加工的UV固化树脂，调整其含量以适应树脂SL的敏感性。还进行了光量热研究，以研究SL曝光后不同配方的固化行为。作为应用于PFPE的立体光刻的第一个示例，将新开发的PFPE光敏聚合物的立体光刻可加工性与作为基准的标准光刻胶（DL260（R））进行了比较。优化配方的特点是减少了激光穿透深度（<75微米）和较小的临界能量，因此可以快速打印微米级结构。如通过SEM检查所证明的那样，以高保真度快速打印了以不同的柱间距（200除以350μm）为特征的圆柱形柱（直径为85 pm，高度为400μm）阵列。进行了静态和动态条件下的接触角测量，以研究使用水和油作为探测液体的织构样品的表面性能。将PFPEs的拒液性能与SL排列的DL260（R）纹理表面的性能进行了比较。高水接触角和低滞后现象表明，可以成功获得高疏水性表面，并且具有最佳拒油性的特征还在于表现最佳。最后，这项研究表明，可以通过一步，经济高效且省时的过程轻松实现全憎表面。 （C）2017 Elsevier B.V.保留所有权利。

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