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

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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1-nm thick liquid lubricant films has been required In this ultra-thin films, the conventional continuous theory is no longer valid and a new lubrication theory should be established because the thickness of the liquid film is of the order of molecular size.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.