Current Nanoscience


Rheological and Electrical Transitions in Carbon Nanotube/Epoxy Suspensions

Author(s): A. Allaoui, N. El Bounia.


The rheological and electrical properties of suspensions of carbon nanotubes in an uncured epoxy resin were investigated by means of shear rheology and impedance spectroscopy. It was found that above an onset CNT weight fraction (0.1 wt%), the steady viscosity increased with CNT loading and presented a shear thinning behaviour. The concentration dependence of viscosity changed from a power law to an exponential with increasing shear rate, indicating a loss of interaction between aggregates and CNT network breakage. The fluid-to-solidlike and insulator-to-conductor transitions occurred in the same CNT weight fraction range between 0.5 and 0.6 wt %. The correspondence of these transitions was explained by the reduction of contact resistance between CNT by stiffening of the CNT network leading to improved electronic transport.

Keywords: Suspensions, carbon nanotubes, rheological properties, impedance spectroscopy, transitions

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Article Details

Year: 2010
Page: [158 - 162]
Pages: 5
DOI: 10.2174/157341310790945669
Price: $58