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Bio-inspired antifogging PDMS coupled micro-pillared superhydrophobic arrays and SiO2 coatings

机译：生物启发防雾PDMS耦合微柱超疏水阵列和SiO2涂层

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摘要

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 SiO2 coatings. It was found that the PF coupled with sprayed SiO2 coatings and a MPA have a higher water contact angle (CA) of 158 degrees and a lower contact angle hysteresis (CAH) of less than 2 degrees. 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 SiO2) 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，通过具有超疏水表面的一些典型生物的启发，使用UV光刻和模板方法成功设计和制造了生物启发的抗大雾PDMS。首先，我们使用传统的UV光刻用生物启发的微柱阵列（MPA）制造了SU-8层。然后，用作制造PDMS膜（PF）的模板。之后，用SiO 2涂层化学改性。发现与喷雾的SiO 2涂层和MPa偶联的PF具有158度的较高的水接触角（CA），并且较低接触角滞后（CAH）小于2度。可以在86.8ms内与该生物启发的PDMS表面分离水滴。更重要的是，该薄膜的抗狗属性优于优异的，恢复时间小于13秒，这显着优于平坦的PF和PF与MPa的PF。然后，应用FTIR以分析表面化学特征，并建议生物启发的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性抗原性能。同时，进一步观察到雾滴的显微镜和宏观动态运动行为。然后，还揭示了底层的防雾机制。这些性质主要受益于液滴，化学组合物（纳米粗糙度SiO2）和物理结构（MPa）的分子间吸引的偶联效果。该调查提供了一种充满希望的方式，可以在聚合物和其他材料上轻松设计和制造多尺度等级结构。更重要的是，这些研究结果表明了在显示装置，运输，农业温室，食品包装和太阳能产品中的特定防雾应用的巨大潜在价值，特别是在连续的苛刻雾化条件下。

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  • 来源
    《RSC Advances》 |2018年第47期|共9页
  • 作者

    Han Zhiwu; Feng Xiaoming; Jiao Zhibin; Wang Ze; Zhang Junqiu; Zhao Jie; Niu Shichao; Ren Luquan;

  • 作者单位

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

    Jilin Univ Key Lab Bion Engn Minist Educ Changchun 130022 Peoples R China;

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