Effect of electroreduction on the EPR spectra due to charge carriers in carbon blacks |
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| Authors: | John R. Harbour Mary Jane Walzak |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, University of Kurdistan, 66177-15175 Sanandaj, Iran;2. Nanotechnology and Water Sustainability Research (NanoWS) Unit, College of Science, Engineering and Technology, University of South Africa, Johannesburg 1709, South Africa |
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| Abstract: | 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 (ΔHpp ~ 23 G) in both CSX-99 and BP-1300 carbon blacks. This narrowing was coincident with the manifestation of the narrow EPR signal (ΔHpp ~ 5 G, which has been previously shown to arise during electroreduction. In addition, changes in the cavity Q were also observed under electro-reduction and subsequent electrooxidation. This decrease in the dielectric loss and the narrowing of the EPR linewidth observed upon electroreduction are discussed. |
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| Keywords: | Carbon black electron paramagnetic resonance |
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