Material-related contact time dependence of adhesion force revealed by an AFM cantilever in a humid environment
Material-related contact time dependence of adhesion force revealed by an AFM cantilever in a humid environment
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DOI：
10.1016/j.apsusc.2021.149357
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发表时间：
2021-02-27
影响因子：
6.7
通讯作者：
Guo, Mingli
中科院分区：
文献类型：
--
作者：
Lai, Tianmao;Chen, Yuguo;Guo, Mingli
在文献中，粘附力的接触时间依赖性是相互矛盾的，需要澄清。测量了不同材料的硅悬臂梁与样品之间的粘附力和亲水性，以考察在潮湿环境下对原子力显微镜(AFM)的依赖性。结果表明，这种依赖关系与表面材料有关。在硅、玻璃和蓝宝石样品上，粘附力随停留时间呈对数增加，然后达到饱和。这是由于薄膜表面的液体粘度较大，阻碍了液桥的生长，导致饱和时间较长。对于其他样品(云母、二氧化硅、金膜、高取向热解石墨(HOPG)、聚甲基丙烯酸甲酯(PMMA)、类金刚石(DLC)膜和石墨烯涂层二氧化硅)，力不依赖于停留时间。这归因于薄膜的低粘度导致非常短的饱和时间。然而，在测量过程中观察到了这些样品由于反复接触而产生的一些异常行为，其背后的可能原因也与接触区液桥的演化有关。研究结果可为小型结构和装置的防粘着设计提供参考。
Contact time dependence of adhesion force in the literature is conflicting and needed to be clarified. The adhesion forces between silicon cantilevers and samples with different materials and hydrophilicity were measured to investigate the dependence on an atomic force microscope (AFM) in a humid environment. Results show that the dependence is related to surface materials. On the samples of silicon, glass, and sapphire, the adhesion force increases with dwell time logarithmically, and then reaches saturation. This was attributed to the large viscosity of thin liquid film on the surfaces, which hampers the growth of a liquid bridge, resulting in the long saturation time. For other samples (mica, silica, Au film, highly oriented pyrolytic graphite (HOPG), polymethyl methacrylate (PMMA), diamond-like carbon (DLC) film, and graphene-coated silica), the force does not depend on the dwell time. This was attributed to a very short saturated time due to the low viscosity of a film. However, some abnormal behaviors due to repeated contacts were observed on these samples during the measurements, and the possible reasons behind them were also related to the evolution of a liquid bridge in the contact zone. The results may facilitate the anti-adhesion design for small-scale structures and devices.