Sponsor
J.M.H. and J.D. acknowledge support from DOE grant no.242649 and NASAIDS grant 1911057Z4. C.H.H. acknowledges the support from the National Science Foundation under grant no.2237345 and support fromtheCamilleandHenryDreyfusFoundation.Thiswork wassupportedbytheCoffeeScienceFoundation,underwritten by financial support forNuovaSimonelli.Y.-H.K.was supported by National Research Foundation of Korea (grantno.2019R1A6A1A10073887)
Published In
Matter
Document Type
Article
Publication Date
1-2024
Subjects
Granular electrification
Abstract
Triboelectrification is the physical process where materials acquire surface charge from frictional interactions at their interfaces.The magnitude of charge depends on the interfacial material composition and can be harnessed in emergent technologies for energy generation.
The mechanism of electrostatic accumulation is complex and is further obscured in granular materials where collisions are sufficiently energetic to cause fracturing. In this “fractoelectric” regime, crack initiation and propagation are thought to charge particles through transfer of electrons and/or ions at the hot crack interface.
Whether a material’s charging is dominated by tribo- or fractoelectrification, fracture-generated granular flows often comprise particles whose surface charge density may exceed the theoretical maximum value of 27 μC per meter squared or charge-to-mass ratios in the range of 0.1–100 nC per gram.
There remains fundamental interest in studying the mechanism and magnitude of charging and methods to control the process, in particular to mitigate spurious effects such as electrostatic discharges and agglomeration within industrial settings.
Rights
Copyright (c) 2024 The Authors
This work is licensed under a Creative Commons Attribution 4.0 International License.
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Persistent Identifier
https://archives.pdx.edu/ds/psu/41061
Citation Details
Méndez Harper, Joshua; Kim, Yong-Hyun; Bumbaugh, Robin E.; McDonald, Connor S.; Hendon, Christopher H.; Cope, Elana J.; Lindberg, Leif E.; Pham, Justin; and multiple additional authors, "Moisture-controlled Triboelectrification during coffee grinding" (2024). Electrical and Computer Engineering Faculty Publications and Presentations. 770.
https://archives.pdx.edu/ds/psu/41061