Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics (NLBB), The Ohio State University, 201 W.19th Avenue, Columbus, Ohio 43210-1142, USA.
Nanoscale. 2014 Jun 7;6(11):5838-52. doi: 10.1039/c3nr06646k. Epub 2014 Apr 22.
Nano-objects in dry and liquid conditions have shown reductions in friction and wear on the macroscale. In this research, for the first time, Au nanorods were studied on the nanoscale under dry conditions and submerged in water for their effect on friction and wear reduction. The data were compared with spherical Au nanoparticles. Atomic force microscopy (AFM) experiments on the nanoscale were performed in single-nano-object contact with an AFM tip, where nano-objects were laterally manipulated, and multiple-nano-object contact with a tip attached to a glass sphere sliding over several nano-objects. Nanoscale and macroscale wear tests with an AFM and ball-on-flat tribometer were performed to relate friction and wear reduction on both scales. Results indicate that Au nano-objects contribute to friction and wear reduction due to the reduced contact area and possible rolling and sliding on the nanoscale. Compression tests (global deformation) using a nanoindenter with a flat punch were used to investigate the mechanical behavior under load and its relation to friction and wear reduction. Repeat compression tests of nano-objects were performed which showed a strain hardening effect and increased pop-ins during subsequent loads.
在干燥和液体条件下的纳米物体已经显示出在宏观尺度上摩擦和磨损的减少。在这项研究中，首次在纳米尺度上研究了金纳米棒在干燥条件下和浸入水中的情况，以研究它们对减少摩擦和磨损的影响。数据与球形金纳米粒子进行了比较。在纳米尺度上进行了原子力显微镜 (AFM) 实验，其中使用 AFM 尖端进行单个纳米物体接触，在此过程中对纳米物体进行横向操纵，并使用附着在玻璃球上的尖端进行多个纳米物体接触，使玻璃球在几个纳米物体上滑动。使用 AFM 和球对平面摩擦试验机进行了纳米尺度和宏观尺度的磨损测试，以将两种尺度上的摩擦和磨损减少联系起来。结果表明，由于接触面积减小以及在纳米尺度上可能发生滚动和滑动，金纳米物体有助于减少摩擦和磨损。使用带有平面冲头的纳米压痕仪进行了压缩测试（整体变形），以研究在负载下的力学行为及其与减少摩擦和磨损的关系。对纳米物体进行了重复的压缩测试，显示出应变硬化效应，并在随后的负载中出现了更多的弹出。
