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Electrical properties of copper-loaded polymer composites
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Paper Abstract

3D printing of multi-material objects enables the design of complex 3D architectures such as printed electronics and devices. The ability to detect the composition of multi-material printed inks in real time is an enabling feature in a wide range of manufacturing sectors. In this study, dielectric properties of microscale embedded metal particles in a dielectric matrix have been characterized using impedance measurements as a function of particle size, shape, volume percentage and frequency. Measurements were found to agree well with calculations based on an anisotropic Maxwell-Garnett dielectric function model. Despite the metal loading exceeding the theoretical percolation threshold, a percolation transition was not observed in the experimental results. With this data, a calibration curve can be established to correlate metal loading with impedance or capacitance, which can be used with an in situ sensor for ink composition measurements during extrusion-based 3D printing. We demonstrate how an in situ sensor can locally measure the composition of the ink, allowing greater control over the resulting properties and functionality of printed materials.

Paper Details

Date Published: 1 April 2019
PDF: 9 pages
Proc. SPIE 10971, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII, 1097111 (1 April 2019); doi: 10.1117/12.2514280
Show Author Affiliations
Jenny Wang, Lawrence Livermore National Lab. (United States)
Allan S. Chang, Lawrence Livermore National Lab. (United States)
Sarai N. Sherfield, Georgia Institute of Technology (United States)
Alexandra M. Golobic, Lawrence Livermore National Lab. (United States)
Steven L. Hunter, Lawrence Livermore National Lab. (United States)
Eric B. Duoss, Lawrence Livermore National Lab. (United States)
Manyalibo J. Matthews, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 10971:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII
Andrew L. Gyekenyesi, Editor(s)

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