Laser-Induced Fluorinated Graphene for Superhydrophobic Surfaces with Anisotropic Wetting and Switchable Adhesion
Laser-Induced Fluorinated Graphene for Superhydrophobic Surfaces with Anisotropic Wetting and Switchable Adhesion
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DOI：
10.1016/j.apsusc.2021.151339
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发表时间：
2021-09
影响因子：
6.7
通讯作者：
K. Nam;Moataz Abdulhafez;Golnaz Najaf Tomaraei;M. Bedewy
中科院分区：
文献类型：
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作者：
K. Nam;Moataz Abdulhafez;Golnaz Najaf Tomaraei;M. Bedewy
我们提出了一种简单的直写方法，用于直接在分子工程聚合物上图案化氟掺杂纳米碳，以用于超疏水和准疏水表面。我们首先合成了两种不同的聚合物薄膜，非氟化和氟化聚酰亚胺（PI），通过两步程序，以创建聚（酰胺酸）前体，然后通过热固化。在激光发射过程中，通过调整扫描线间距（101.6 ~ 508 μm），控制了薄膜的形貌和化学组成，实现了超疏水性，在垂直于扫描线的方向上，水接触角（CA）可达156°。液滴在我们的多孔石墨烯微图案上表现出强粘附性，即使在垂直和倒置取向下保持时也是如此，这表明Cassie浸渍润湿状态。线间距为355.6 μm的准疏水F-LINC在垂直（θA = 165°，θR = 127°）和平行（θA = 147°，θR = 87°）方向上均表现出高的动态CA沿着，以及高的各向异性CA滞后（Δθ θ = 38°，Δθ θ = 60°）。此外，我们证明了应变诱导的可切换的粘附力，通过利用基板曲率控制。此外，我们表明，我们的微图案化聚合物膜可用于转移液滴而没有任何损失或污染。因此，我们的方法提供了新的见解设计界面的液滴操作，取放应用程序，和本地化的反应控制。
We present a facile direct-write approach for patterning fluorine-doped nanocarbons directly on molecularly engineered polymers for superhydrophobic and parahydrophobic surfaces. We first synthesized two different polymer films, non-fluorinated and fluorinated polyimides (PIs), by two-step procedure to create poly(amic acid) precursors, followed by thermal curing. Morphology and chemical composition were controlled by adjusting the programmed scan line pitch from 101.6 to 508 μm during lasing to achieve superhydrophobicity with a water contact angle (CA) up to 156° in the direction perpendicular to carbonized lines. Droplets exhibited strong adhesion on our porous graphene micropatterns even when held at vertical and inverted orientations, indicating a Cassie impregnating state of wetting. Parahydrophobic F-LINC with line pitch of 355.6 μm exhibits high dynamic CAs along both perpendicular (θA⊥= 165°,θR⊥= 127°) and parallel directions (θA‖= 147°,θR‖= 87°) as well as highly anisotropic CA hysteresis (Δθ⊥= 38°, Δθ‖= 60°). Moreover, we demonstrate strain-induced switchable adhesion by leveraging substrate curvature control. Further, we show that our micropatterned polymer films can be used for transferring droplets without any loss or contamination. Hence, our approach offers new insights into designing interfaces for droplet manipulation, pick-and-place applications, and localized control of reactions.