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Setup of the SFS. The piezoceramic tube is comprised of an excitation and a detection electrode segment. The mechanical decoupling of the SFS from the environment is provided by rubber O-rings.
Plots of dissipation vs distance measured with the SFS (a) in water and (b) in water-glycerol mixtures. The solid curves are fitted with two free parameters and constant gap and follow the expected power law as a function of the gap. The experimental curves in (b) are raw data and offset corrected.
Scanning the SFS from left to right over (a) a step and (b) a ridge in a 4:1 water-glycerol mixture. The diameter of the sensor head was 960 μm and is indicated to scale. The topography of the substrate is indicated at the bottom and has a step height of 5.7 μm. The SFS was scanned 14 μm over the step and 12 μm over the 270-μm-wide ridge.
Measured and literature values of the viscosity ratio of three water-glycerol mixtures.
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