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Study of Percolation in PMMA / Indium Tin Oxide Composites

Published online by Cambridge University Press:  15 March 2011

Charles J. Capozzi ,
Sandra Shackelford ,
Runqing Ou  and
Rosario A. Gerhardt
Charles J. Capozzi
Affiliation:
SURF student from Rutgers University, School of Engineering Piscataway, NJ 08854-8065, U.S.A.
Sandra Shackelford
Affiliation:
Georgia Institute of Technology, School of Materials Science and Engineering Atlanta, GA 30332-0245, U.S.A.
Runqing Ou
Affiliation:
Georgia Institute of Technology, School of Materials Science and Engineering Atlanta, GA 30332-0245, U.S.A.
Rosario A. Gerhardt
Affiliation:
Georgia Institute of Technology, School of Materials Science and Engineering Atlanta, GA 30332-0245, U.S.A.
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Abstract

Knowledge of percolation in binary composites is critical to the development of new materials with specific electrical and optical properties. This report investigates the detection of percolation in novel two-phase composites consisting of poly(methyl) methacrylate(PMMA) and indium tin oxide (ITO). ITO is a filler of particular interest primarily for possessing optical clarity consistent with PMMA in the visible light range. AC impedance measurements were performed on specimens with varying concentrations of ITO particles to determine the percolation threshold. Percolation was observed when specimens contained 2-3% vol. of nano- sized ITO and 6%-8% vol. of coarse-sized ITO. Thus, the percolation threshold appeared significantly decreased with reduced particle size of the filler. It is speculated that minor agglomerates in the bulk of the specimens may have prevented percolation from occurring at even lower volume fractions of the filler phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 819: Symposia N/P – Interfacial Engineering for Optimized Properties III , 2004 , N3.13
Copyright
Copyright © Materials Research Society 2004

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