article published yes Galien M Grosjean author 0C5FDA4A-9CF6-11E9-8939-FF05E66974250000-0001-5154-417X Scott R Waitukaitis author 3A1FFC16-F248-11E8-B48F-1D18A9856A870000-0002-2299-3176 ScWa department Tribocharge: a multi-scale approach to an enduring problem in physics project ISTplus - Postdoctoral Fellowships project Nominally identical materials exchange net electric charge during contact through a mechanism that is still debated. ‘Mosaic models’, in which surfaces are presumed to consist of a random patchwork of microscopic donor/acceptor sites, offer an appealing explanation for this phenomenon. However, recent experiments have shown that global differences persist even between same-material samples, which the standard mosaic framework does not account for. Here, we expand the mosaic framework by incorporating global differences in the densities of donor/acceptor sites. We develop an analytical model, backed by numerical simulations, that smoothly connects the global and deterministic charge transfer of different materials to the local and stochastic mosaic picture normally associated with identical materials. Going further, we extend our model to explain the effect of contact asymmetries during sliding, providing a plausible explanation for reversal of charging sign that has been observed experimentally. https://research-explorer.ista.ac.at/download/13197/13198/Mosaic_asymmetries.pdf application/pdfno American Physical Society2023 eng Physics and Astronomy (miscellaneous)General Materials Science 2475-9953 2304.12861 00101956590000210.1103/physrevmaterials.7.065601 76 G. M. Grosjean and S. R. Waitukaitis, “Asymmetries in triboelectric charging: Generalizing mosaic models to different-material samples and sliding contacts,” <i>Physical Review Materials</i>, vol. 7, no. 6. American Physical Society, 2023. G.M. Grosjean, S.R. Waitukaitis, Physical Review Materials 7 (2023). Grosjean, Galien M., and Scott R. Waitukaitis. “Asymmetries in Triboelectric Charging: Generalizing Mosaic Models to Different-Material Samples and Sliding Contacts.” <i>Physical Review Materials</i>, vol. 7, no. 6, 065601, American Physical Society, 2023, doi:<a href="https://doi.org/10.1103/physrevmaterials.7.065601">10.1103/physrevmaterials.7.065601</a>. Grosjean, G. M., &#38; Waitukaitis, S. R. (2023). Asymmetries in triboelectric charging: Generalizing mosaic models to different-material samples and sliding contacts. <i>Physical Review Materials</i>. American Physical Society. <a href="https://doi.org/10.1103/physrevmaterials.7.065601">https://doi.org/10.1103/physrevmaterials.7.065601</a> Grosjean GM, Waitukaitis SR. 2023. Asymmetries in triboelectric charging: Generalizing mosaic models to different-material samples and sliding contacts. Physical Review Materials. 7(6), 065601. Grosjean GM, Waitukaitis SR. Asymmetries in triboelectric charging: Generalizing mosaic models to different-material samples and sliding contacts. <i>Physical Review Materials</i>. 2023;7(6). doi:<a href="https://doi.org/10.1103/physrevmaterials.7.065601">10.1103/physrevmaterials.7.065601</a> Grosjean, Galien M, and Scott R Waitukaitis. “Asymmetries in Triboelectric Charging: Generalizing Mosaic Models to Different-Material Samples and Sliding Contacts.” <i>Physical Review Materials</i>. American Physical Society, 2023. <a href="https://doi.org/10.1103/physrevmaterials.7.065601">https://doi.org/10.1103/physrevmaterials.7.065601</a>. 131972023-07-07T12:48:01Z2025-04-14T07:43:55Z