通过褶皱不稳定性实现的自发润湿性图案化。
Spontaneous wettability patterning via creasing instability.
作者信息
Chen Dayong, McKinley Gareth H, Cohen Robert E
机构信息
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
出版信息
Proc Natl Acad Sci U S A. 2016 Jul 19;113(29):8087-92. doi: 10.1073/pnas.1522700113. Epub 2016 Jul 5.
Surfaces with patterned wettability contrast are important in industrial applications such as heat transfer, water collection, and particle separation. Traditional methods of fabricating such surfaces rely on microfabrication technologies, which are only applicable to certain substrates and are difficult to scale up and implement on curved surfaces. By taking advantage of a mechanical instability on a polyurethane elastomer film, we show that wettability patterns on both flat and curved surfaces can be generated spontaneously via a simple dip coating process. Variations in dipping time, sample prestress, and chemical treatment enable independent control of domain size (from about 100 to 500 μm), morphology, and wettability contrast, respectively. We characterize the wettability contrast using local surface energy measurements via the sessile droplet technique and tensiometry.
具有图案化润湿性对比的表面在诸如传热、集水和颗粒分离等工业应用中很重要。制造此类表面的传统方法依赖于微加工技术，这些技术仅适用于某些基材，并且难以扩大规模并应用于曲面。通过利用聚氨酯弹性体薄膜上的机械不稳定性，我们表明，通过简单的浸涂工艺可以在平面和曲面上自发产生润湿性图案。浸涂时间、样品预应力和化学处理的变化分别能够独立控制畴尺寸（约100至500μm）、形态和润湿性对比。我们通过静置液滴技术和张力测量法使用局部表面能测量来表征润湿性对比。
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