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Charge injection into insulators / B. Bouattou 

Public ISBD Titre : Charge injection into insulators Type de document : texte imprimé Auteurs : B. Bouattou, Auteur ; John Lowell, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1987 Importance : 94 f. Présentation : ill. Format : 30 cm. Note générale : Master of Science : Electrical engineering : Victoria University of Manchester : 1987 Annexe [15] f. Bibliogr. [3] f Langues : Anglais (eng) Mots-clés : Polymers Charge  transfer Conduction  mechanism Polarisation Index. décimale : Ms00487 Résumé : This thesis describes a new techniques to obtain information about the mechanisms of conduction in polymers by measuring the charge transfer in repeated contacts with liquid mercury. Conventinal conductivity measurements employing electrodes and methods based on the surface potential cannot reliably distinguish between the motion of free carriers and polarisation currents associated with dipole orientation. Our technique in contrast can provide a good indication of conduction mechanism and can distinguish true charge from polarisation charge. The experiments show that charge is immobile on PTFE and SAPHIRE; free intrinsic carriers are responsible for the conduction in NYLON. Novel behaviour is found for PS, PMMA, PVC; charge remains close to the surface for short time between contacts. However, for longer time, experiment shows that the charge is mobile but the mechanism of motion is unclear. Charge injection into insulators [texte imprimé] / B. Bouattou, Auteur ; John Lowell, Directeur de thèse . - Manchester : [s.n.], 1987 . - 94 f. : ill. ; 30 cm. Master of Science : Electrical engineering : Victoria University of Manchester : 1987 Annexe [15] f. Bibliogr. [3] f Langues : Anglais (eng) Mots-clés : Polymers Charge  transfer Conduction  mechanism Polarisation Index. décimale : Ms00487 Résumé : This thesis describes a new techniques to obtain information about the mechanisms of conduction in polymers by measuring the charge transfer in repeated contacts with liquid mercury. Conventinal conductivity measurements employing electrodes and methods based on the surface potential cannot reliably distinguish between the motion of free carriers and polarisation currents associated with dipole orientation. Our technique in contrast can provide a good indication of conduction mechanism and can distinguish true charge from polarisation charge. The experiments show that charge is immobile on PTFE and SAPHIRE; free intrinsic carriers are responsible for the conduction in NYLON. Novel behaviour is found for PS, PMMA, PVC; charge remains close to the surface for short time between contacts. However, for longer time, experiment shows that the charge is mobile but the mechanism of motion is unclear.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00487	Ms00487	Papier	Bibliothèque centrale	Mémoire de Master	Disponible

Documents numériques

BOUATTOU.B.pdf URL