Rheological study of new dispersions of carbon nanotubes in the ionic liquid 1-ethyl-3-methylimidazolium dicyanamide

Journal ar
Journal of Molecular Liquids
  • Volumen: 278
  • Fecha: 15 marzo 2019
  • Páginas: 368-375
  • ISSN: 01677322
  • Tipo de fuente: Revista
  • DOI: 10.1016/j.molliq.2019.01.074
  • Tipo de documento: Artículo
  • Editorial: Elsevier B.V.
© 2019 Elsevier B.V. Dispersions of three different types of carbon nanotubes in a 1 wt% proportion in the low viscosity 1-ethyl-3-methylimidazolium ([EMIM][DCA]) ionic liquid have been obtained. The neat ionic liquid presents Newtonian behavior, but the addition of carbon nanotubes increases the viscosity with respect to [EMIM][DCA] in the following order: Single-Walled Carbon Nanotubes (SWCNTs) > aligned Multi-Walled Carbon Nanotubes (aligned-MWCNTs) > Multi-Walled Carbon Nanotubes (MWCNTs), and the resulting fluids show non-Newtonian behavior. SWCNTs and MWCNTs dispersions present shear thinning with increasing shear rate, but a shear thickening effect for aligned-MWCNTs at intermediate shear rate values at room temperature has been observed. This effect disappears at 100 °C. The thermal response of the viscosity of [EMIM][DCA] and the CNTs-IL dispersions can be fitted to the Arrhenius model. For [EMIM][DCA] and the dispersion with MWCNTs the viscous behavior prevails at low frequencies, with a cross point at a critical frequency value which decreases with increasing temperature. However, the dispersions of SWCNTs and aligned-MWCNTs present storage modulus values higher than loss modulus in the whole range of frequency.

Palabras clave del autor

    Palabras clave indexadas

      Detalles de financiación