斥水表面。使表面甚至对完全润湿的液体也具有超斥水性。
Repellent surfaces. Turning a surface superrepellent even to completely wetting liquids.
机构信息
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles (UCLA), Los Angeles, CA 90095, USA.
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles (UCLA), Los Angeles, CA 90095, USA. Department of Bioengineering, UCLA, Los Angeles, CA 90095, USA.
出版信息
Science. 2014 Nov 28;346(6213):1096-100. doi: 10.1126/science.1254787.
Superhydrophobic and superoleophobic surfaces have so far been made by roughening a hydrophobic material. However, no surfaces were able to repel extremely-low-energy liquids such as fluorinated solvents, which completely wet even the most hydrophobic material. We show how roughness alone, if made of a specific doubly reentrant structure that enables very low liquid-solid contact fraction, can render the surface of any material superrepellent. Starting from a completely wettable material (silica), we micro- and nanostructure its surface to make it superomniphobic and bounce off all available liquids, including perfluorohexane. The same superomniphobicity is further confirmed with identical surfaces of a metal and a polymer. Free of any hydrophobic coating, the superomniphobic silica surface also withstands temperatures over 1000°C and resists biofouling.
迄今为止，超疏水和超疏油表面是通过使疏水材料粗糙化来制造的。然而，还没有任何表面能够排斥极低能量的液体，如氟化溶剂，这些溶剂甚至完全润湿最疏水的材料。我们展示了仅通过粗糙度，如果由特定的双重内凹结构制成，该结构能够使液体与固体的接触面积非常小，则可以使任何材料的表面具有超疏水性。从完全可润湿的材料（二氧化硅）开始，我们对其表面进行微纳结构化处理，使其具有超疏油性，并使所有可用液体（包括全氟己烷）弹开。通过对金属和聚合物的相同超疏油表面进行测试，进一步证实了这种超疏油性。无需任何疏水涂层，超疏油的二氧化硅表面还能承受超过 1000°C 的温度，并能抵抗生物污垢。
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