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The friction-induced charging (i.e., tribocharging) and the followingdischarging (referred here as tribodischarging) are always believed to havenegative effects on the daily life and on the industrial production. Thus, howto inhibit the tribocharging and the tribodischarging has caused wide publicconcern. Because the discharge caused by the electrical breakdown of theambient gas is generally accompanied with the generation of light, weinvestigated here the tribocharging and the tribodischarging by observing thelight emitted during friction. We found that the position reversal of thefriction pair has a dramatic impact on the intensity of the tribo-inducedlight. Experimental results show that an intense light is produced when astationary Al2O3 disk is sliding on a rotating SiO2 disk, but only a weak lightis observed for the case of a stationary SiO2 disk and a rotating Al2O3 disk.This means that the process of the tribocharging and the tribodischarging canbe significantly influenced owing to the change in the relative position of thefriction couple. The experimentally measured polarities of the tribo-inducedcharge on the friction surfaces further indicated that the strong dischargingoccurs when the rotating surface is negatively charged. The reason for thedifference in the intensity of the tribocharging and tribodischarging can beattributed to the combined effects of the contact potential difference and thetemperature gradient between the contacting surfaces on the charge transferwhen friction. Finally, a simple, low cost, yet effective approach, i.e., justkeep the friction partner whose surface is tribo-induced negatively charged asthe stationary one, can be utilized to suppress the intensity of thetribocharging and the tribodischarging. This work may provide potentialapplications in numerous areas of science and engineering and also in theeveryday life.

Effects of the Position Reversal of Friction Pairs on the Strength of Tribocharging and Tribodischarging