EPR Imaging Investigations of Glass Epoxy Composite Materials and Tracer Diffusion in Ceramics

  • Wayne A. Bryden
  • Bernard Collins
  • Theodore O. Poehler

Abstract

Nondestructive evaluation (NDE) of flaws and defects in non-metallic materials including polymers, ceramics, semiconductors and composites is important for scientists and engineers involved in a wide variety of applications. Magnetic resonance techniques are potentially powerful tools for this purpose. The ability to map out details of internal structure in a noninvasive manner using Nuclear Magnetic Resonance (NMR) has revolutionized diagnostic medicine. Some of the same benefits are realizable for the NDE of solid materials using Electron Paramagnetic Resonance (EPR) and EPR Imaging (EPRI) [1]. This technique has the potential to yield three-dimensional images of manufacturing defects and damage sites in nearly any non-metallic solid.

Keywords

Porosity Quartz Microwave Toluene Epoxy 

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References

  1. 1.
    W. A. Bryden and T. O. Poehler, Proc. 46th Annual Mtg. Society of Plastics Engineers: ANTEC 88. Atlanta, GA, 1988, p. 1280; W. A. Bryden and T. O. Poehler, in Nondestructive Evaluation: NDE Planning and Application, Vol. 5, edited by R. D. Streit (ASME, New York, 1989) p. 129; W. A. Bryden and T. 0. Poehler, in Review of Progress in Quantitative NDE, Vol. 9K, edited by D. O. Thompson and D. E. Chimenti ( Plenum Press, New York, 1990 ), p. 1101.Google Scholar
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    P. C. Lauterbur, Nature 242, 190–191 (1973); P. C. Lauterbur, IEEE Trans. Nucl. Sci. NS-26. 2802–2809 (1979).Google Scholar
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    DPPH (2, 2-Diphenyl-l-picrylhydrazyl) is a stable, solid-state free radical compound.Google Scholar

Copyright information

© Plenum Press, New York 1993

Authors and Affiliations

  • Wayne A. Bryden
    • 1
  • Bernard Collins
    • 2
  • Theodore O. Poehler
    • 2
  1. 1.The Johns Hopkins Applied Physics LaboratoryLaurelUSA
  2. 2.Department of Materials Science and EngineeringThe Johns Hopkins UniversityBaltimoreUSA

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