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Effect of Aggregation on the Rheological Properties of Carbon Nanotube Dispersions

Published online by Cambridge University Press:  01 February 2011

Sameer Sharad Rahatekar ,
Jeffrey W Gilman ,
K K Koziol ,
Simon Butler ,
James A Elliott ,
Milo Shaffer ,
Malcolm Mackley  and
Alan H Windle
Sameer Sharad Rahatekar
Affiliation:
sameer@nist.gov, National Institute of Standards and Technology, Building and Fire Research Division, 100 Bureau Drive, Building 224, Gaithersburg, MD, 20899, United States, 301-975-5336
Jeffrey W Gilman
Affiliation:
jwgilman@nist.gov, National Institute of Standards and Technology, Fire Research Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States
K K Koziol
Affiliation:
kk292@cam.ac.uk, University of Cambridge, Materials Science and Metallurgy, Cambridge, CB2 3QZ, United Kingdom
Simon Butler
Affiliation:
sab1000@cam.ac.uk, University of Cambridge, Chemical Engineering, Cambridge, CB2 3QZ, United Kingdom
James A Elliott
Affiliation:
jae1001@cam.ac.uk, University of Cambridge, Materials Science and Metallurgy, Cambridge, CB2 3QZ, United Kingdom
Milo Shaffer
Affiliation:
m.shaffer@imperial.ac.uk, Imperial College, London, Department of Chemistry, London, SW7 2AZ, United Kingdom
Malcolm Mackley
Affiliation:
mrm5@cam.ac.uk, University of Cambridge, Chemical Engineering, Cambridge, CB2 3QZ, United Kingdom
Alan H Windle
Affiliation:
ahw1@cam.ac.uk, University of Cambridge, Materials Science and Metallurgy, Cambridge, CB2 3QZ, United Kingdom
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Abstract

In this pape effect of nanotube aggrates on the rheological properties of multiwall carbonanntube abd epoxy suspension in epoxy resin.The base epoxy resin was found to be essentially Newtonian, and the progressive incorporation of nanotubes enhanced the low shear rate viscosity of the suspension by nearly two decades. At higher shear rates, the suspension viscosity asymptotically thinned to the viscosity of the matrix alone. The low shear rate viscosity enhancement was correlated with the optical observations of interconnected aggregates of carbon nanotubes, which themselves were induced by the low shear conditions. Intermediate shear rates resulted in a reduction in the size of the aggregates. High shear rates appeared to cause near complete dispersal of the aggregates. From these results it is conjectured that for this suspension, shear thinning is connected with the breaking of the interconnected network between aggregates of nanotubes, and not by nanotube alignment.

Keywords

nanostructurefluidicsoptical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 953: Symposium G – Fibrillar Aggregates as Materials—Assembly, Properties and Applications , 2006 , 0953-G01-09
Copyright
Copyright © Materials Research Society 2007

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References

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