Direct, Robust Technique for the Measurement of Friction between Microspheres
Direct, Robust Technique for the Measurement of Friction between Microspheres
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DOI：
10.1021/acs.langmuir.5b01086
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发表时间：
2015-08-18
期刊：
影响因子：
3.9
通讯作者：
Spencer, Nicholas D.
中科院分区：
文献类型：
--
作者：
Fernandez, Nicolas;Cayer-Barrioz, Juliette;Spencer, Nicholas D.
微观物体之间的摩擦控制着许多宏观现象。例如，微凸体之间的摩擦决定了粗糙表面在接触和相对运动时的摩擦学。此外，颗粒间的摩擦对颗粒介质的流变响应有很大影响，从单颗粒水平的微观接触到剪切的、干燥的颗粒体系和非布朗悬浮液的宏观流动特性。我们提出了一种基于侧向力显微镜的新的、精确的、稳健的方法来定量测量微球之间的摩擦系数，而不需要复杂的数据处理。我们已经成功地将这种方法应用于有聚合物涂层和没有聚合物涂层的液体中二氧化硅微球之间的接触。
Friction between microscopic objects controls many macroscopic phenomena. For instance, the friction between microasperities determines the tribology of rough surfaces in contact and in relative motion. Additionally, the friction between microparticles is responsible for many aspects of the rheological response of granular media, ranging from microscale contacts at the single-particle level to macroscopic flow properties of sheared, dry granular systems and non-Brownian suspensions. We propose a new, precise, and robust method, based on lateral force microscopy, to measure the coefficient of friction between microspheres quantitatively and without complex data processing. We have successfully applied this method to the contact between silica spheres in liquid with and without a polymer coating.