Template‐Free Scalable Fabrication of Linearly Periodic Microstructures by Controlling Ribbing Defects Phenomenon in Forward Roll Coating for Multifunctional Applications
Template‐Free Scalable Fabrication of Linearly Periodic Microstructures by Controlling Ribbing Defects Phenomenon in Forward Roll Coating for Multifunctional Applications
复制标题
DOI：
10.1002/admi.202201237
复制
发表时间：
2022-08
影响因子：
5.4
通讯作者：
Md. Didarul Islam;Himendra Perera;B. Black;Matthew Phillips;Muh-Jang Chen;G. Hodges;Allyce Jackman;Yuxuan Liu;C. Kim;M. Zikry;Saad A Khan;Yong Zhu;M. Pankow;J. Ryu
中科院分区：
文献类型：
--
作者：
Md. Didarul Islam;Himendra Perera;B. Black;Matthew Phillips;Muh-Jang Chen;G. Hodges;Allyce Jackman;Yuxuan Liu;C. Kim;M. Zikry;Saad A Khan;Yong Zhu;M. Pankow;J. Ryu
来自自然界的周期性微/纳米结构激发了科学界采用表面设计用于各种应用，包括超疏水减阻。这种周期性微结构的实际应用的一个主要关注点仍然是常规微制造技术的可扩展性。这项研究展示了一种简单的无模板可扩展的制造技术，通过控制前向辊涂中的肋状缺陷来制造周期性微结构。粘弹性复合涂层材料设计用于使用碳纳米管（CNT）和聚二甲基硅氧烷（PDMS）的辊涂，这有助于实现周期性为114-700 µm的可控肋。根据工艺参数，图案化的微结构从线性排列过渡到随机结构。周期性的微结构使疏水性，因为样品的水接触角范围为128°至158°。当在静水中拖曳时，涂覆有微结构膜的模型船显示出比具有平坦PDMS膜的船快7%-8%的速度。CNT的加入显示出机械和电学性能的改善。在机械划痕测试中，CNT-PDMS膜的内聚破坏发生在比裸PDMS高出约90%的力下。此外，非导电裸PDMS显示出747.84-22.66 Ω □-1的薄层电阻，其中包含0.5 - 2.5重量%的CNT。
Periodic micro/nanoscale structures from nature have inspired the scientific community to adopt surface design for various applications, including superhydrophobic drag reduction. One primary concern of practical applications of such periodic microstructures remains the scalability of conventional microfabrication technologies. This study demonstrates a simple template‐free scalable manufacturing technique to fabricate periodic microstructures by controlling the ribbing defects in the forward roll coating. Viscoelastic composite coating materials are designed for roll‐coating using carbon nanotubes (CNT) and polydimethylsiloxane (PDMS), which helps achieve a controllable ribbing with a periodicity of 114–700 µm. Depending on the process parameters, the patterned microstructures transition from the linear alignment to a random structure. The periodic microstructure enables hydrophobicity as the water contact angles of the samples ranged from 128° to 158°. When towed in a static water pool, a model boat coated with the microstructure film shows 7%–8% faster speed than the boat with a flat PDMS film. The CNT addition shows both mechanical and electrical properties improvement. In a mechanical scratch test, the cohesive failure of the CNT‐PDMS film occurs in ≈90% higher force than bare PDMS. Moreover, the nonconductive bare PDMS shows sheet resistance of 747.84–22.66 Ω □−1 with 0.5 to 2.5 wt% CNT inclusion.