Figure 8.
Modulation of the normal force at a frequency much higher than the frequency of the stick-slip events results in a significant decrease in the friction, and the appearance of a modulation signal in the lateral force. A voltage of 5.0 V is equivalent to 280 nN modulation peak–peak (linear scale) of the normal load. The average normal load is held constant at 50 nN. [Reprinted with permission from van Spengen, W. M.; Wijts, G. H. C. J.; Turq, V.; Frenken, J. W. M. J. Adhes. Sci. Technol. 2010, 24, 2669–2680.]
