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arXiv 1406.2797cond-mat.mtrl-sci
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高速摩擦显微镜和纳米级摩擦系数测绘

High Speed Friction Microscopy and Nanoscale Friction Coefficient Mapping

James L. Bosse, Sungjun Lee, Bryan D. Huey, Andreas Sø Andersen, Duncan S. Sutherland

摘要:

随着纳米/微米尺度的机械设备越来越多地被采用,了解纳米尺度的摩擦和磨损,特别是在技术上相关的滑动速度是至关重要的。因此,一种新的技术已经开发的摩擦系数映射(FCM),利用高速原子力显微镜的最新进展。该技术基于单个位置的一系列图像有效地获取摩擦力曲线,每个图像具有递增的较低载荷。因此,摩擦系数的真实地图可以唯一地计算异质表面。这些参数是在扫描速度快至2毫米/秒的微制造二氧化硅台面和金涂层坑,产生的结果是相同的传统的速度测量,尽管是1000倍快。为了证明自定义设置的滑动速度上限,云母的摩擦性能报告为200 μm/sec至2 cm/sec。虽然FCM适用于任何AFM和扫描速度,但异质滑动或滚动组件的定量纳米摩擦学研究因此是唯一可能的,即使在MEMS,生物植入物或数据存储系统等设备的实际速度下也是如此。

英文摘要:

As mechanical devices in the nano/micro length scale are increasingly employed, it is crucial to understand nanoscale friction and wear especially at technically relevant sliding velocities. Accordingly, a novel technique has been developed for Friction Coefficient Mapping (FCM), leveraging recent advances in high speed AFM. The technique efficiently acquires friction versus force curves based on a sequence of images at a single location, each with incrementally lower loads. As a result, true maps of the coefficient of friction can be uniquely calculated for heterogeneous surfaces. These parameters are determined at a scan velocity as fast as 2 mm/s for microfabricated SiO2 mesas and Au coated pits, yielding results that are identical to traditional speed measurements despite being ~1000 times faster. To demonstrate the upper limit of sliding velocity for the custom setup, the friction properties of mica are reported from 200 μm/sec up to 2 cm/sec. While FCM is applicable to any AFM and scanning speed, quantitative nanotribology investigations of heterogeneous sliding or rolling components are therefore uniquely possible, even at realistic velocities for devices such as MEMS, biological implants, or data storage systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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