Fig. 3 Various methods of tribocharge removal on sliding polymer surfaces can control friction between them. Various methods of tribocharge removal on.

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Fig. 3 Various methods of tribocharge removal on sliding polymer surfaces can control friction between them. Various methods of tribocharge removal on sliding polymer surfaces can control friction between them. Sliding a PTFE piece horizontally on cellulose, (A) friction between PTFE and cellulose increases with sliding distance and consecutive runs, as measured by the Hanatek Advanced Friction Tester. (B) Removal of tribocharges by various methods of charge dissipation. (C) Reset of CoF(D) to its initial value with corona discharge treatment (data marked with green circle) and ethanol rinsing (data marked with red circle) of PTFE on cellulose at the 35th run (sliding distance per run = 15 cm). (D) Attaching a grounded metal (flat brass, 0.25 mm thick) to the back of the PTFE piece prevents both the accumulation of charges at the polymer surface and (E) the increase in the CoF(D) (red dots = metal-grounded PTFE on cellulose; black dots = PTFE on cellulose). PTFE, 5 cm × 5 cm × 0.25 mm; cellulose, 10 cm × 20 cm × 0.165 mm; FN = 0.15 N is adjusted by putting additional weight on bare PTFE or metal backing on PTFE (see the Supplementary Materials and figs. S1, S2, and S7 to S10 for further experimental details and the effects of sign of net charge, contact area, load, material transfer between the surfaces, and atmosphere on simultaneous tribocharging and friction). Khaydarali Sayfidinov et al. Sci Adv 2018;4:eaau3808 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).