Abstract
This work reports recent experimental findings and rheological modeling on chemically treated single-walled carbon nanotubes (CNTs) suspended in an epoxy resin. When a CNT suspension is subject to a steady shear flow, it exhibited a shear-thinning characteristic, which was subsequently modeled by a Fokker-Planck (FP) simple orientation model. In terms of viscoelasticity, small-amplitude oscillatory measurements revealed mild elasticity for semi-dilute CNT suspensions. Some tentative models are proposed in order to model the extra contribution of elasticity due to the presence of CNTs.
Highlights
This work reports recent experimental findings and rheological modeling on chemically treated singlewalled carbon nanotubes (CNTs) suspended in an epoxy resin
When a CNT suspension is subject to a steady shear flow, it exhibits a shear-thinning characteristic
A “quasi-network” model was proposed in order to model the extra contribution of elasticity due to the presence of CNTs
Summary
This work reports recent experimental findings and rheological modeling on chemically treated singlewalled carbon nanotubes (CNTs) suspended in an epoxy resin. It is conjectured that CNTs interact via repulsive force but there is no physical contact between them in a semi-dilute suspension. Smallamplitude oscillations perturb this orientation distribution, with a tendency for the CNTs to return to an isotropic orientation distribution. The network model predicts that both G” and G’ increase as a function of frequency. This paper revisits the main orientation mechanisms that allow defining a large variety of mechanical models
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