Exploring the radical nature of a carbon surface by electron paramagnetic resonance and a calibrated gas flow

Uri Green, Yulia Shenberger, Zeev Aizenshtat, Haim Cohen, Sharon Ruthstein

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

While the first Electron Paramagnetic Resonance (EPR) studies regarding the effects of oxidation on the structure and stability of carbon radicals date back to the early 1980s the focus of these early papers primarily characterized the changes to the structures under extremely harsh conditions (pH or temperature)1-3. It is also known that paramagnetic molecular oxygen undergoes a Heisenberg spin exchange interaction with stable radicals that extremely broadens the EPR signal4-6. Recently, we reported interesting results where this interaction of molecular oxygen with a certain part of the existing stable radical structure can be reversibly affected simply by flowing a diamagnetic gas through the carbon samples at STP7. As flows of He, CO2, and N2 had a similar effect these interactions occur at the surface area of the macropore system. This manuscript highlights the experimental techniques, work-up, and analysis towards affecting the existing stable radical nature in the carbon structures. It is hoped that it will help towards further development and understanding of these interactions in the community at large.

Original languageEnglish
Article numbere51548
JournalJournal of Visualized Experiments
Issue number86
DOIs
StatePublished - 24 Apr 2014

Keywords

  • Carbon
  • Carbon-centered radical
  • Chemistry
  • Electron paramagnetic resonance (EPR)
  • Issue 86
  • Oxidation
  • Oxygen
  • Radicals

ASJC Scopus subject areas

  • Neuroscience (all)
  • Chemical Engineering (all)
  • Biochemistry, Genetics and Molecular Biology (all)
  • Immunology and Microbiology (all)

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