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Spreading of triboelectrically charged granular matter
Deepak Kumar1, A Sane1, Smita Gohil1
1Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400-005, India.
Scientific Reports
|June 13, 2014
Summary
Charged glass particles spread on plastic surfaces, forming wavy patterns and particle jets due to frictional drag. This reveals complex dynamics in triboelectric processes.
Area of Science:
- Physics
- Materials Science
- Surface Science
Background:
- Triboelectric charging is crucial for particle manipulation.
- Understanding particle dynamics on charged surfaces is key for industrial applications.
Purpose of the Study:
- To investigate the spreading dynamics of triboelectrically charged glass particles on a plastic surface.
- To analyze the instabilities and pattern formation during particle spreading under agitation.
Main Methods:
- Observation of monolayer spreading of charged glass particles on a plastic cylinder.
- Application of constant mechanical agitation.
- Analysis of emergent instabilities and pattern formation.
Main Results:
- Particles spread as a monolayer, forming wavy-stripe density modulations.
- Instabilities lead to the ejection of particle jets.
- Jets coalesce into a homogeneous, layered spreading front.
- Pattern formation is linked to time-evolving frictional drag.
Conclusions:
- The study reveals complex, multiscale dynamical instabilities in triboelectric processes.
- Frictional drag plays a significant role in macroscopic pattern formation.
- Further research is needed to understand the microscopic origins of these observed phenomena.
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