...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Friction mechanism of individual multilayered nanoparticles
【24h】

Friction mechanism of individual multilayered nanoparticles

机译：单个多层纳米颗粒的摩擦机理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Inorganic nanoparticles of layered [two-dimensional (2D)] compounds with hollow polyhedral structure, known as fullerene-like nanoparticles (IF), were found to have excellent lubricating properties. This behavior can be explained by superposition of three main mechanisms: rolling, sliding, and exfoliation-material transfer (third body). In order to elucidate the tribological mechanism of individual nanoparticles in different regimes, in situ axial nanocompression and shearing forces were applied to individual nanoparticles using a high resolution scanning electron microscope. Gold nanoparticles deposited onto the IF nanoparticles surface served as markers, delineating the motion of individual IF nanoparticle. It can be concluded from these experiments that rolling is an important lubrication mechanism for IF-WS_2 in the relatively low range of normal stress (0.96±0.38 GPa). Sliding is shown to be relevant under slightly higher normal stress, where the spacing between the two mating surfaces does not permit free rolling of the nanoparticles. Exfoliation of the IF nanoparticles becomes the dominant mechanism at the high end of normal stress; above 1.2 GPa and (slow) shear; i.e., boundary lubrication conditions. It is argued that the modus operandi of the nanoparticles depends on their degree of crystallinity (defects); sizes; shape, and their mechanical characteristics. This study suggests that the rolling mechanism, which leads to low friction and wear, could be attained by improving the sphericity of the IF 'nanoparticle, the dispersion (deagglomeration) of the nanoparticles, and the smoothness of the mating surfaces.
机译：发现具有空心多面体结构的层状[二维（2D）]化合物的无机纳米颗粒，即富勒烯样纳米颗粒（IF），具有出色的润滑性能。此行为可以通过三种主要机制的叠加来解释：滚动，滑动和剥落材料转移（第三主体）。为了阐明单个纳米颗粒在不同状态下的摩擦学机理，使用高分辨率扫描电子显微镜对单个纳米颗粒施加原位轴向纳米压缩和剪切力。沉积在IF纳米颗粒表面的金纳米颗粒用作标记，描绘了各个IF纳米颗粒的运动。从这些实验可以得出结论，在相对较低的法向应力范围（0.96±0.38 GPa）下，滚动是IF-WS_2的重要润滑机制。滑动显示在略高的法向应力下是相关的，其中两个配合表面之间的间距不允许纳米粒子自由滚动。在正常应力的高端，IF纳米颗粒的剥落成为主要机制。高于1.2 GPa和（慢）剪切；即边界润滑条件。有人认为，纳米颗粒的操作方式取决于它们的结晶度（缺陷）。尺寸;形状及其机械特性。这项研究表明，可以通过改善IF'纳米颗粒的球形度，纳米颗粒的分散性（解聚）和配合表面的光滑度来获得导致低摩擦和磨损的滚动机制。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号