TY - JOUR A1 - Avilés, María Dolores AU - Pamies Porras, Ramón Francisco AU - Arias Pardilla, Joaquín AU - Carrión Vilches, Francisco José AU - Bermúdez Olivares, María Dolores AU - Sanes Molina, José AU - Avilés González, María Dolores T1 - Rheological study of new dispersions of Carbon Nanotubes in the ionic liquid 1-ethyl-3-methylimidazolium dicyanamide Y1 - 2019 SN - 0167-7322 UR - http://hdl.handle.net/10317/7559 AB - 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 ºC. 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-MWCNTspresent storage modulus values higher than loss modulus in the whole range of frequency. KW - Ciencia de los Materiales e Ingeniería Metalúrgica KW - Carbon Nanotubes; ionic liquid; rheology; viscoelasticity; Raman; non-Newtonian fluids. KW - Carbon Nanotubes KW - Ionic liquid KW - Viscoelasticity KW - Raman KW - Non-Newtonian fluids KW - 3312 Tecnología de Materiales LA - eng PB - © 2019 Elsevier Ltd ER -