Distribution of charge in electrets

Abstract

Measurements are reported of the total charge and its mean position in liquid‐charged FEP electrets. A new nondestructive technique has been used. The large difference in decay rates of positive and negative liquid‐charged electrets is accompanied by quite different behavior of the deposited charge as it migrates through the electret. The total volume charge density present in untreated FEP has been measured: it typically amounts to 0.1–0.6 C m⁻³ for 25‐μ‐thick material.