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Three Dimensional (3D) Electron Paramagnetic Resonance Imaging Technique For Mapping Porosity in Ceramics

Published online by Cambridge University Press:  21 February 2011

G. Kordas  and
Y.H. Kang
G. Kordas
Affiliation:
NSF Center for Advanced Cement-Based Materials, Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, 11 61801. USA
Y.H. Kang
Affiliation:
NSF Center for Advanced Cement-Based Materials, Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, 11 61801. USA
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Abstract

A three dimensional (3D) Electron Paramagnetic Resonance Imaging (EPRI) method has been developed to probe the structure and size of pores in ceramic materials. A computer control current source and magnetic field gradient coil assembly were added on the conventional EPR instrument as imaging devices. This added-on facility was tested using a phantom sample having cavities filled with DPPH (2,2-diphenyl-1-picrylhydrazyl) particles. Pumice was then used to demonstrate the feasibility of the technique. Porous pumice stone was immersed in a 0.5mM 15N-PDT-water solution to introduce the spin labels into the open volume of the sample. A two-dimensional image was reconstructed from a set of 1-D projections using a filtered back-projection technique. A three-dimensional image was derived from 22 2-D images each constructed by 22 1-D projections. At present, the facility allows a resolution of 69 and 46 μm for 2-D and 3-D imaging.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 217: Symposium U – Advanced Tomographic Imaging Methods for the Analysis of Materials , 1990 , 21
Copyright
Copyright © Materials Research Society 1991

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References

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