When Flexoelectricity Drives Triboelectricity

Triboelectricity has been known since antiquity, but the fundamental science underlying this phenomenon lacks consensus. We present a flexoelectric model for triboelectricity where contact deformation induced band bending at the nanoscale is the driving force for charge transfer. This framework is combined with first-principles and finite element calculations to explore charge transfer implications for different contact geometry and materials combinations. We demonstrate that our ab initio based formulation is compatible with existing empirical models and experimental observations including charge transfer between similar materials and size/pressure dependencies associated with triboelectricity.

Automated summary

This article presents a new flexoelectric model for triboelectricity, where contact deformation at the nanoscale drives charge transfer through band bending. The authors use first-principles and finite element calculations to investigate the implications of charge transfer for different contact geometry and materials combinations. They demonstrate that their ab initio based formulation is compatible with existing empirical models and experimental observations.