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Bipolar Tribocharging Signal During Friction Force Fluctuations at Metal–Insulator Interfaces
Author(s) -
Burgo Thiago A. L.,
Erdemir Ali
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201406541
Subject(s) - triboelectric effect , polytetrafluoroethylene , adhesion , insulator (electricity) , contact electrification , metal , surface forces apparatus , materials science , electrostatics , nanogenerator , composite material , chemical physics , electrostatic force microscope , atomic force microscopy , nanotechnology , chemistry , piezoelectricity , metallurgy
Abstract Friction and triboelectrification of materials show a strong correlation during sliding contacts. Friction force fluctuations are always accompanied by two tribocharging events at metal–insulator [e.g., polytetrafluoroethylene (PTFE)] interfaces: injection of charged species from the metal into PTFE followed by the flow of charges from PTFE to the metal surface. Adhesion maps that were obtained by atomic force microscopy (AFM) show that the region of contact increases the pull‐off force from 10 to 150 nN, reflecting on a resilient electrostatic adhesion between PTFE and the metallic surface. The reported results suggest that friction and triboelectrification have a common origin that must be associated with the occurrence of strong electrostatic interactions at the interface.