Understanding the friction and deformation behavior of micro/nano-hierarchical textures through in-situ SEM observation and mechanics modeling
Understanding the friction and deformation behavior of micro/nano-hierarchical textures through in-situ SEM observation and mechanics modeling
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DOI：
10.1016/j.triboint.2021.107271
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发表时间：
2021-09-20
影响因子：
6.2
通讯作者：
Zou, Min
中科院分区：
文献类型：
--
作者：
Afshar-Mohajer, Mahyar;Yang, Xingwei;Zou, Min
微/纳米层次织构在实现表面功能方面起着至关重要的作用。它们在纳米尺度下的摩擦和变形行为虽然重要，但相对未知。在这项研究中，通过有针对性的摩擦测试内的扫描电子显微镜的单个微/纳米层次结构（微柱覆盖纳米头发）制造的双光子光刻，我们发现微柱变形和纳米头发的高度之间的耦合。我们还发现，长纳米头发的弯曲可以提供辅助滑动力，并且由于较长纳米头发的屈曲，即使在滑动之前的正常载荷下也可以产生侧向力。这些研究结果，支持有限元建模的测试，将揭示新的微/纳米层次纹理的设计，以实现变形与控制摩擦的功能表面。
Micro/nano-hierarchical textures play essential roles in realizing the functionalities of surfaces. Their friction and deformation behavior at the nanoscale, although important, are relatively unknown. In this study, through targeted friction tests inside a scanning electron microscope of individual micro/nano-hierarchical structures (micropillars covered with nanohairs) fabricated by two-photon lithography, we discovered the coupling between micropillar deformation and nanohair height. We also found that the bending of long nanohairs can provide assistive sliding forces, and lateral force can develop even under just normal load before sliding due to the buckling of the longer nanohairs. These findings, supported by finite element modeling of the tests, will shed light on the design of novel micro/nano-hierarchical textures to realize deformation-resistant functional surfaces with controlled friction.