Max Planck Institute for Dynamics and Self-Organization Göttingen, 37077 Göttingen, Germany.
Institute of Theoretical Physics I, University Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany.
Phys Rev E. 2017 Jun;95(6-1):062903. doi: 10.1103/PhysRevE.95.062903. Epub 2017 Jun 15.
Equal volume mixtures of small and large polytetrafluorethylene spheres are shaken in an atmosphere of controlled humidity which allows one to also control their tribocharging. We find that the contact numbers are charge dependent: As the charge density of the beads increases, the number of same-type contacts decreases and the number of opposite-type contacts increases. This change is not caused by a global segregation of the sample. Hence, tribocharging can be a way to tune the local composition of a granular material.
将小和大聚四氟乙烯球的等体积混合物在控制湿度的气氛中摇晃，这使得人们也可以控制它们的摩擦带电。我们发现接触数与电荷有关：随着珠粒电荷密度的增加，相同类型的接触数减少，而相反类型的接触数增加。这种变化不是由样品的整体分离引起的。因此，摩擦带电可以成为调整颗粒材料局部组成的一种方式。
