Effect of electroreduction on the EPR spectra due to charge carriers in carbon blacks

✍ Scribed by John R. Harbour; Mary Jane Walzak

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 427 KB
• Volume: 23
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(85)90229-5

✦ Synopsis

The electrochemical reduction of carbon black particles dispersed in methylene chloride was monitored in situ with electron paramagnetic resonance (EPR) spectroscopy. The broad EPR signal is converted to a signal with intermediate linewidth (AH, -23 G) in both CSX-99 and BP-1300 carbon blacks. This narrowing was coincident with the manifestation of the narrow EPR signal (AH, -5 G), which has been previously

shown to arise during electroreduction. In addition, changes in the cavity Q were also observed under electroreduction and subsequent electrooxidation.

This decrease in the dielectric loss and the narrowing of the EPR linewidth observed upon electroreduction are discussed.