Abstract
Using colloid probe atomic force microscopy, we realized accurate measurement of squeeze force generated when the probe approaches a sample surface in liquid. This allows us to quantitatively evaluate slip length of liquids on sample surfaces. We demonstrated that, in contrast to the quartz crystal microbalance method, slip length can be measured regardless of the presence or absence of adsorbed films on sample surfaces and regardless of viscoelasticity of adsorbed films. From measurements on adsorbed films with different molecular structures, correlation between slip length and surface energy of adsorbed films was not observed; instead we suggest that slip length is more likely to correlate with adhesive energy between liquids and the underlying surfaces.
