Single-collision statistics reveal a global mechanism driven by sample history for contact electrification in granular media
G.M. Grosjean, S.R. Waitukaitis, Physical Review Letters 130 (2023).

Quantitatively consistent scale-spanning model for same-material tribocharging
G.M. Grosjean, S. Wald, J.C.A. Sobarzo Ponce, S.R. Waitukaitis, Physical Review Materials 4 (2020).