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首页> 外文期刊>RSC Advances >Bio-inspired antifogging PDMS coupled micro-pillared superhydrophobic arrays and SiO2 coatings
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Bio-inspired antifogging PDMS coupled micro-pillared superhydrophobic arrays and SiO2 coatings

机译：仿生防雾PDMS耦合微柱超疏水阵列和SiO2涂层

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In this work, inspired by some typical creatures from nature with superhydrophobic surfaces, a bio-inspired antifogging PDMS is designed and fabricated successfully using UV lithography and a template method. First, we fabricated an SU-8 layer with a bio-inspired micro-pillared array (MPA) using traditional UV lithography. Then, it was used as a template to fabricate a PDMS film (PF). After that, it was chemically modified with SiO _(2) coatings. It was found that the PF coupled with sprayed SiO _(2) coatings and a MPA have a higher water contact angle (CA) of 158° and a lower contact angle hysteresis (CAH) of less than 2°. Water drops can be separated from this bio-inspired PDMS surface within 86.8 ms. More importantly, this film’s antifogging property is superior, with a recovery time of less than 13 s, which is significantly superior to that of the flat PF and the PF with the MPA. Afterwards, FTIR was applied to analyse the surface chemistry features and suggested that the bio-inspired PF has extremely low surface tension. So, it can be confirmed that an excellent superhydrophobic antifogging property has been achieved on the surface of the PF. Meanwhile, the microscopic and macroscopic dynamic movement behaviour of the fog drops was further observed. Then, the underlying antifogging mechanism was also revealed. These properties mainly benefit from the coupling effect of intermolecular attraction of droplets, chemical compositions (nanometre roughness SiO _(2) ) and the physical structures (MPA). The investigations offer a promising way to handily design and fabricate multiscale hierarchical structures on polymers and other materials. More importantly, these findings suggest great potential value for specific antifogging applications in display devices, transport, agricultural greenhouses, food packaging and solar products, especially in continuous harsh fogging conditions.
机译：在这项工作中，受自然界中一些典型的具有超疏水表面的生物的启发，使用紫外线光刻和模板方法成功地设计和制造了生物启发的防雾PDMS。首先，我们使用传统的紫外线光刻技术，制作了具有生物启发性微柱阵列（MPA）的SU-8层。然后，将其用作制造PDMS膜（PF）的模板。之后，用SiO_（2）涂层进行化学改性。发现与喷涂SiO_（2）涂层结合的PF和MPA具有158°的较高水接触角（CA）和小于2°的较低接触角滞后（CAH）。可以在86.8毫秒内从该生物启发的PDMS表面分离水滴。更重要的是，该膜的防雾性能优异，恢复时间不到13秒，明显优于平板PF和带有MPA的PF。之后，FTIR被用于分析表面化学特征，并表明生物启发的PF具有极低的表面张力。因此，可以确认在PF的表面上已经实现了优异的超疏水防雾性能。同时，进一步观察了雾滴的微观和宏观动态运动行为。然后，还揭示了潜在的防雾机理。这些性质主要受益于液滴的分子间吸引力，化学成分（纳米粗糙度SiO _（2））和物理结构（MPA）的耦合效应。研究提供了一种有前途的方法，可以方便地在聚合物和其他材料上设计和制造多尺度的分层结构。更重要的是，这些发现为显示设备，运输工具，农业温室，食品包装和太阳能产品中的特定防雾应用提供了巨大的潜在价值，尤其是在持续的恶劣雾化条件下。

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