Presentation Information
[3E04]Contact and sliding with the intervening lubricant molecules studied using the surface forces apparatus
*Shinji YAMADA1 (1. Kao Corporation)
The surface forces apparatus (SFA) is one of the most powerful friction measuring techniques to “observe” the contact condition of liquid-lubricated surfaces at the molecular level. Optical technique employed in the SFA, fringes of equal chromatic order (FECO), enables us to measure the thickness of intervening lubricant film (base liquid and/or additives) during sliding with the resolution of 0.1 nm. This precise thickness measurement realizes the detailed discussion on the structure of the lubricant film and its change (e.g., squeezing and/or conformational rearrangement of lubricant molecules in the film) induced by sliding motions. In this talk, a brief explanation on the SFA technique and some landmark works will be given. Then, our recent study on the contact condition and unique friction properties of the adsorbed bilayers of an anionic surfactant in aqueous solution will be described.