Rapid method to measure diffusion of paramagnetic species: Mn2+ in poly(ethylene-co-methacrylic acid) ionomers

Neena K. Tierney, Richard A. Register

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

We present a facile method to measure Fickian diffusion coefficients of paramagnetic species in materials, using electron spin resonance (ESR) spectroscopy. The method requires no postannealing sample preparation, is adaptable to in situ measurement, and requires only that the spectrum of the paramagnetic species change monotonically with its local concentration. We illustrated this method with poly(ethylene-co-methacrylic acid) ionomers, using laminates prepared from the same copolymer neutralized with either paramagnetic Mn2+ or diamagnetic Zn2+. For Mn2+, the exchange interaction between neighboring Mn2+ caused the six-line hyperfine pattern to transform to a single broad signal, providing the measurement of local concentration. Diffusion coefficients of Mn2+ in this ionomer pair measured by ESR were compared with those for Zn2+ measured by conventional electron probe microanalysis and found to be in satisfactory agreement.

Original languageEnglish (US)
Pages (from-to)2736-2743
Number of pages8
JournalJournal of Materials Research
Volume17
Issue number10
DOIs
StatePublished - Oct 1 2002

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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