EElectretsElectretsde G. M. Sessler, M. G. Broadhurst, G. T. Davis, R. Gerhard-Multhaupt, B. GrossMateriasChemistryPlasma (Ionized gases)Biomedical engineeringOptical materialsOptical and Electronic MaterialsAtoms, Molecules, Clusters and PlasmasBiophysics/Biomedical Physics