State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
Suzhou Key Laboratory of Environment and Biosafety, Research Institute of Southeast University in Suzhou, Suzhou, 215123, China.
Adv Mater. 2018 May;30(22):e1800103. doi: 10.1002/adma.201800103. Epub 2018 Mar 30.
Bioinspired re-entrant structures have been proved to be effective in achieving liquid superrepellence (including anti-penetration, anti-adhesion, and anti-spreading). However, except for a few reports relying on isotropic etching of silicon wafers, most fluorination-dependent surfaces are still unable to repel liquids with extreme low surface energy (i.e., γ < 15 mN m ), especially those fluorinated solvents. Herein, triply re-entrant structures, possessing superrepellence to water (with surface tension γ of 72.8 mN m ) and various organic liquids (γ = 12.0-27.1 mN m ), are fabricated via two-photon polymerization based 3D printing technology. Such structures can be constructed both on rigid and flexible substrates, and the liquid superrepellent properties can be kept even after oxygen plasma treatment. Based on the prepared triply re-entrant structures, micro open capillaries are constructed on them to realize directional liquid spreading, which may be applied in microfluidic platforms and lab-on-a-chip applications. The fabricated arrays can also find potential applications in electronic devices, gas sensors, microchemical/physical reactors, high-throughput biological sensors, and optical displays.
受生物启发的复入口结构已被证明在实现液体超疏液性（包括抗穿透、抗粘附和抗扩散）方面非常有效。然而，除了少数依赖于各向同性硅晶圆刻蚀的报道外，大多数依赖于氟化的表面仍然无法排斥具有极低表面能（即γ<15 mN m）的液体，尤其是那些氟化溶剂。在此，通过双光子聚合的 3D 打印技术，制备了对水（表面张力γ为 72.8 mN m）和各种有机溶剂（γ=12.0-27.1 mN m）具有超疏液性的三重复入口结构。这种结构可以构建在刚性和柔性基底上，即使经过氧等离子体处理，其液体超疏液性也能保持。基于制备的三重复入口结构，在其上构建了微开放毛细管，以实现定向液体扩展，这可能应用于微流控平台和芯片实验室应用。所制备的阵列还可能在电子设备、气体传感器、微化学/物理反应器、高通量生物传感器和光学显示器中找到潜在的应用。
