Abstract
In this Note we examine six atomic force microscopes or similar instruments for the measurement of surface forces, and we find that they suffer in various degrees from a nonideal performance of the piezo scanner during the acquisition of force curves. This is negligible at low scanning speeds but becomes relevant at higher speeds. In the three most favorable cases the set velocity is attained only after a settling time, which varies among the instruments. In the three least favorable cases, the set velocity is neither attained nor constant. We indicate how to work out the true piezo velocity from experimental force data. We also show that utilizing the wrong velocity leads to misinterpreting the collected data, and we do this on the example of a hydrodynamic drainage force measurement between a colloid and a flat surface in aqueous solution.
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