Tunable Multiplanar Nanowrinkled Surface Platform,Advanced Materials Interfaces

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Tunable Multiplanar Nanowrinkled Surface Platform
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-07-09 , DOI: 10.1002/admi.201800663
Bethany Hughes _{1,

2,

3} , Seyed-Shahriar Riazi _{1,

2,

3} , Lauren Romita _{1,

2,

3} , Stephen D. Waldman _{1,

2,

3} , Dae Kun Hwang _{1,

2,

3}

Affiliation

Wrinkled surfaces have extraordinary characteristics, such as enlarged surface area and enhanced adhesion, which form the basis of several emerging applications in electrical, mechanical, and biological processes. Furthermore, wrinkles at a nanoscale display additional ultrahigh functions offering enhanced Raman scattering and superhydrophobicity; however, artificial nanowrinkled morphology is mostly limited to simple planar surfaces. Here, a microfluidics‐based approach to create tunable nanowrinkles on nonplanar surfaces is developed. In this approach, polyethylene glycol microposts using photolithography in a polydimethylsiloxane microfluidic channel are first fabricated. A syringe pump is then used with a washing solvent, ethanol, to remove the excess unpolymerized monomer from the microfluidic channel. In combination with nonuniform photopolymerization, this washing postprocess results in microposts with a fully cured inner layer and a partially cured outer layer. The partially cured layer spontaneously forms nanowrinkles upon plasma treatment. Their wavelengths are tunable by controlling the thickness of the partially cured layer during the washing process. The effect of the flow rate and duration of the washing fluid on the wavelength of nanowrinkle formed is investigated.

中文翻译：

可调谐的多平面纳米皱纹表面平台

起皱的表面具有非凡的特性，例如增大的表面积和增强的附着力，这些特性构成了电气，机械和生物过程中多种新兴应用的基础。此外，纳米级的皱纹还显示出额外的超高功能，从而增强了拉曼散射和超疏水性。然而，人工纳米皱纹的形态主要限于简单的平面表面。在这里，开发了一种基于微流体的方法，可以在非平面表面上创建可调的纳米皱纹。在这种方法中，首先在聚二甲基硅氧烷微流体通道中使用光刻法制造了聚乙二醇微柱。然后将注射泵与洗涤溶剂乙醇一起使用，以从微流体通道中去除过量的未聚合单体。与不均匀的光致聚合相结合，该洗涤后过程导致具有完全固化的内层和部分固化的外层的微柱。在等离子体处理后，部分固化的层自发形成纳米皱纹。通过在洗涤过程中控制部分固化层的厚度，可以调节它们的波长。研究了洗涤液的流速和持续时间对所形成的纳米皱纹波长的影响。

更新日期：2018-07-09

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