Prototyping of Superhydrophobic Surfaces from Structure-Tunable Micropillar Arrays Using Visible Light Photocuring
Prototyping of Superhydrophobic Surfaces from Structure-Tunable Micropillar Arrays Using Visible Light Photocuring
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DOI：
10.1002/adem.201801150
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发表时间：
2019-08-01
影响因子：
3.6
通讯作者：
Hosein, Ian D.
中科院分区：
文献类型：
--
作者：
Li, Hansheng;Chen, Fu-Hao;Hosein, Ian D.
报道了一种利用光诱导自写入技术在透明表面上制备微柱阵列的新方法。一个周期性的微尺度光束阵列通过一层光交联丙烯酸酯树脂薄膜传输。每束光束都会经历与光聚合引起的介质折射率变化相关的自透镜，这与光束在空间中发散的自然趋势相反。结果，一个微尺度的柱子沿着每束光束的传播路径生长。微柱的并行、并行自写导致了基于微柱的阵列的原型，具有精确改变柱直径和间距的能力。这些阵列被喷涂了一层薄薄的聚四氟乙烯(PTFE)纳米颗粒，以创建大面积的超疏水表面，其水接触角大于150度，接触角滞后较小。在所探索的微柱阵列的整个范围内实现了高透明度。这些阵列在机械上也是耐用的，对磨损也很坚固。这是一种可扩展的、直接的方法，可用于功能表面和防湿应用的结构可调的微柱阵列。
A new approach is reported to fabricate micropillar arrays on transparent surfaces by employing the light-induced self-writing technique. A periodic array of microscale optical beams is transmitted through a thin film of photo-crosslinking acrylate resin. Each beam undergoes self-lensing associated to photopolymerization-induced changes in the refractive index of the medium, which counters the beam's natural tendency to diverge over space. As a result, a microscale pillar grows along each beam's propagation path. Concurrent, parallel self-writing of micropillars leads to the prototyping of micropillar-based arrays, with the capability to precisely vary the pillar diameter and inter-spacing. The arrays are spray coated with a thin layer of polytetrafluoroethylene (PTFE) nanoparticles to create large-area superhydrophobic surfaces with water contact angles greater than 150 degrees and low contact angle hysteresis. High transparency is achieved over the entire range of micropillar arrays explored. The arrays are also mechanically durable and robust against abrasion. This is a scalable, straightforward approach toward structure-tunable micropillar arrays for functional surfaces and anti-wetting applications.