Precision measurement of tribocharging in acoustically levitated sub-millimeter grains.

  title={Precision measurement of tribocharging in acoustically levitated sub-millimeter grains.},
  author={Adam G. Kline and Melody X. Lim and Heinrich M. Jaeger},
  journal={The Review of scientific instruments},
  volume={91 2},
Contact electrification of dielectric grains forms the basis for a myriad of physical phenomena. However, even the basic aspects of collisional charging between grains are still unclear. Here, we develop a new experimental method, based on acoustic levitation, which allows us to controllably and repeatedly collide two sub-millimeter grains and measure the evolution of their electric charges. This is, therefore, the first tribocharging experiment to provide complete electric isolation for the… 

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