Lee Junghoon, Lee Myeong-Hoon, Choi Chang-Hwan
Department of Mechanical Engineering, Stevens Institute of Technology, Castle Point on Hudson, New Jersey 07030, United States.
Department of Metallurgical Engineering, Pukyong National University, Busan 48547, Republic of Korea.
ACS Appl Mater Interfaces. 2022 Jan 12;14(1):2411-2423. doi: 10.1021/acsami.1c22587. Epub 2022 Jan 3.
A lubricant-infused surface such as an oil-impregnated porous surface has great potentials for various applications due to its omniphobicity. However, the drainage and depletion of the lubricant liquid oil remain practical concerns for real applications. Here, we investigate the effect of a specially designed bottle-shaped nanopore of anodic aluminum oxide, which has a smaller pore diameter in the upper region than the lower one, on the oil retentivity and anti-corrosion efficacy. The effects of the viscosity and volatility of the lubricant oil were further investigated for synergy. Results show that the bottle-shaped pore helps to stably immobilize the lubricant oil in the nanostructure and significantly enhances the robustness and anti-corrosion efficacy, compared to the conventional cylindrical pores with straight walls as well as the hybrid one featured with additional pillar structures. Moreover, the enlarged oil capacity in the bottle-shaped pore allows the oil to cover the underlying metallic surface effectively at cracks, enhancing the damage tolerance with a unique self-healing capability. The oil with a higher viscosity further enhances the benefits so that the bottle-shaped pore impregnated with a higher-viscosity oil shows greater anti-corrosion efficacy. It suggests that the combination of the geometric features of nanopores and the fluid properties of lubricant liquid can lead to a maximized longevity and anti-corrosion efficacy of the liquid-infused surfaces for real applications.
诸如浸油多孔表面之类的注入润滑剂的表面，因其超疏液性而在各种应用中具有巨大潜力。然而，润滑剂液体油的排出和耗尽仍是实际应用中的现实问题。在此，我们研究了阳极氧化铝的一种特殊设计的瓶形纳米孔（其上部区域的孔径小于下部区域）对油保持力和抗腐蚀效果的影响。还进一步研究了润滑油的粘度和挥发性的协同作用。结果表明，与具有直壁的传统圆柱形孔以及具有附加柱状结构的混合孔相比，瓶形孔有助于将润滑油稳定地固定在纳米结构中，并显著提高其坚固性和抗腐蚀效果。此外，瓶形孔中增大的油容量使油能够在裂纹处有效地覆盖下面的金属表面，以独特的自愈能力提高损伤容限。粘度较高的油进一步增强了这些益处，因此注入高粘度油的瓶形孔显示出更大的抗腐蚀效果。这表明纳米孔的几何特征与润滑剂液体的流体特性相结合，可以使注入液体的表面在实际应用中的寿命和抗腐蚀效果最大化。
