Systematic elucidation of nano-lubrication properties of ultra-thin liquid lubricant films

在高密度磁盘存储设备(硬盘驱动器)和微纳机械中，由于机械元件的小型化，这种超薄膜需要形成1 nm厚的液体润滑膜，传统的连续理论不再适用，需要建立新的润滑理论，因为液体膜的厚度是分子尺寸的量级。然而，新的理论还没有建立起来，最大的障碍之一是用常规的测量方法来测量纳米滑动间隙之间的润滑现象。本项目旨在开发纳米滑动间隙的测量方法和建立新的润滑技术。这些测量方法需要亚纳米级的精确间隙控制、亚神经网络高灵敏度的测力以及滑动纳米厚液膜的观察。在这个项目中，我们开发了PAR和垂直公里测量，间隙测量，纳米厚润滑膜的观察，以及开发的测量方法的集成。结合已开发的剪切份额和间隙测量，我们成功地测量了纳米厚润滑膜的力学性能。我们还通过对极性和非极性润滑膜的测量，阐明了吸附分子对润滑膜的机械性能有显著影响。此外，结合已开发的剪切力和垂直固体力测量，可以同时测量两种力。此外，验证了观察膜方法的可行性。在有趣的是，我们将开发一种方法，可以同时测量剪切力和垂直力，膜分布，并系统地解释纳米润滑现象。

In high-density magnetic disk storage devices (hard disk drives) and micro/nano-machines, due to miniaturization of mechanical elements, lubrication Ming 1-nm thick liquid lubricant films has been required In this ultra-thin films, the conventional continuous theory is no longer valid and a new lubrication theory should be established because the thickness of the liquid film is of the order of molecular size. However the new theory has not been established yet One of the biggest obstacle is measurement of the lubrication phenomenon between nanometer sliding gaps by using conventional measurement methods. This project aimed at developing measurement methods and establishing the new lubrication techniques for the nanometer sliding gaps. The measurement methods requires sub-nm-order precise gap control, sub-nN-high-sensitive force measurement, and observation of sliding nm-thick-liquid films. In this project, we fried to develop Par and vertical- km measurement, gap measurement, observation of nm-thick lubricant films, and integration of developed measurement methods. Combining developed shear share and gap measurements, we successfully measured mechanical properties of nm-thick lubricant films. We also clarified that adsorbed molecules significantly affect the mechanical properties by measuring polar and non-polar lubricant films. In addition, combining developed shear and vertical- firm measurements, two forces could be simultaneously measured. Moreover, feasibility of the observation film method was verified. In the funny, we will develop a method that can measure shear and vertical-forces, film distribution simultaneously and elucidate nano-lubrication phenomena systematically.