Charge transfer between a polymer particle and a metal plate due to impact

To elucidate the mechanism of contact-impact electrification of insulating particles, the authors measured the charge generated by collision of a single polymer particle onto a metal plate. It was not exclusively the normal component of the impact velocity that determined the amount of impact charging. In order to investigate this great contribution of the impact angle to the impact charging, impact stresses, contact times, and contact areas were measured, and the impact-contact process was discussed. Based on the idea that the “apparent contact area” is supported by some “real contact points” and that the number of these real contact points increases with the particle slipping, a new model called “effective contact area model” was proposed