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Shear-strain step response in linear regime of dilute suspensions of naturally bent carbon nanotubes

Type
Articles dans des revues avec comité de lecture
Author
CRUZ, Camilo
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]
ILLOUL, Lounès
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]
CHINESTA, Francisco
10921 Institut de Recherche en Génie Civil et Mécanique [GeM]
REGNIER, Gilles
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]

URI
http://hdl.handle.net/10985/6800
DOI
10.1002/app.36571
Date
2012
Journal
Journal of Applied Polymer Science

Abstract

Impressive enhancements of the storage modulus have been documented when low volume fractions of single wall carbon nanotubes (SWNTs) are added to a Newtonian solvent for obtaining dilute suspensions. The intrinsic bending dynamics of carbon nanotubes (CNTs) has been proposed to explain such elasticity. CNTs contain topological defects inducing naturally bent structures in absence of external forces and, hence, a semiflexible filament with a bent configuration at minimal internal-bending-energy is used for mimicking the structure of SWNTs in suspension. Previous continuous model is discretized as a non-freely jointed bead-rod chain with a naturally bent configuration for simulating the rheological behaviour after a shear-strain step in linear regime of SWNT dilute suspension by using a Brownian dynamics (BD) approach. In general, bead-rod chains exhibit an instantaneous relaxation after a high shear-strain step. Bending rigidity and number of constitutive rods are found to be determinant parameters in the internal-energy relaxation behaviour of non-freely jointed bead-rod chains in dilute solution. Proper comparisons between the BD simulation results and the experimental data for treated SWNT dilute suspensions confirm the consistency of the physical model mimicking the structure of a SWNT.

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