Resaerchers Find a Key to Electrostatic Charging (image) Case Western Reserve University Share Print E-Mail Caption Changes in microstructure, such as this void and fibrils created by straining a polymer sheet, appear to control how the material charges through friction. Credit Case Western Reserve University Usage Restrictions Please give proper credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.