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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Ionic liquid microdroplets as versatile lithographic molds for sculpting curved topographies on soft materials surfaces
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Ionic liquid microdroplets as versatile lithographic molds for sculpting curved topographies on soft materials surfaces

机译：离子液体微滴作为通用的光刻模具，用于在柔软的材料表面上雕刻弯曲的形貌

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摘要

Soft lithography comprises a set of approaches for shaping the surface of soft materials such as PDMS on the microscopic scales. These procedures usually begin with the development of templates/masters normally generated by electron or photolithography techniques. However, the richness in available shapes is limited, usually producing shapes containing sharp parts. Innovation is called for to develop reliable approaches capable of imparting well-defined 3D curved shapes to these solids, a topology that is somehow unnatural for solid surfaces. Here we report on the use of tiny drops of room-temperature ionic liquid, organic liquids that have attracted increasing amounts of attention in recent years because of their unique chemical properties) as a versatile platform for imprinting PDMS with tunable 3D curved geometry, which is out of reach of conventional lithographic techniques and ranges from almost flat depressions to almost closed cavities on the millimeter to micrometer scale. The concept exploits a peculiar combination of physical properties displayed by ionic liquids as their null volatility and their polarity, together with some unique properties of liquid surfaces as their virtually null surface roughness. Proof-of-concept experiments show their application as chemical microreactors and ultrasmooth optical lenses. This all-liquid method is simple, low-cost, versatile, maskless, tension-free, and easily scalable, so we envision a community-wide application in numerous modern physical, chemical, biological, and engineering settings.
机译：软光刻包括一套用于在微观尺度上对诸如PDMS之类的软材料表面进行整形的方法。这些程序通常从开发通常由电子或光刻技术生成的模板/母版开始。但是，可用形状的丰富度有限，通常会生成包含尖锐部分的形状。需要创新来开发能够为这些实体赋予清晰定义的3D弯曲形状的可靠方法，这种拓扑对于实体表面来说是不自然的。在这里，我们报道了室温离子液体的细小液滴的使用，有机离子液体由于其独特的化学性质而近年来引起了越来越多的关注）作为印记具有可调3D弯曲几何形状的PDMS的多功能平台，这是常规光刻技术所无法达到的，范围从几乎平坦的凹陷到毫米到微米级的几乎封闭的腔体。该概念利用了离子液体作为零挥发度和极性显示的物理特性的特殊组合，以及液体表面实际上为零粗糙的表面的独特特性。概念验证实验表明它们在化学微反应器和超光滑光学镜片中的应用。这种全液体方法简单，低成本，通用，无掩模，无张力且易于扩展，因此我们设想在许多现代物理，化学，生物和工程环境中实现社区范围的应用。

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