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Rheological study of new dispersions of Carbon Nanotubes in the ionic liquid 1-ethyl-3-methylimidazolium dicyanamide

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Identifiers
URI: http://hdl.handle.net/10317/7559
ISSN: 0167-7322
DOI: 10.1016/j.molliq.2019.01.074
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Author
Avilés, María Dolores; Pamies Porras, Ramón Francisco; Arias Pardilla, Joaquín; Carrión Vilches, Francisco José; Bermúdez Olivares, María Dolores; [et al.]
Research Group
Ciencia de Materiales e Ingeniería Metalúrgica
Knowledge Area
Ciencia de los Materiales e Ingeniería Metalúrgica
Sponsors
The authors acknowledge the Ministerio de Economía, Industria y Competitividad (MINECO, Spain), the EU FEDER Program (Grants # MAT2014-55384-P and # MAT2017-85130-P), and Fundación Séneca - Agencia de Ciencia y Tecnología de la Región de Murcia “Ayuda a las Unidades y Grupos de Excelencia Científica de la Región de Murcia (Programa Séneca 2014)” (Grant # 19877/GERM/14), for financial support. M.D. Avilés acknowledges a research fellowship (Grant # BES-2015-074836) to MINECO.
Publication date
2019
Publisher
© 2019 Elsevier Ltd
Bibliographic Citation
R.Pamies, M.D.Avilés, J.Arias-Pardilla, F.J.Carrión, J.Sanes, M.D.Bermúdez. Rheological study of new dispersions of carbón nanotubes in the ionic liquid 1-ethyl-3methylimidazolium dicyanamide. Molliq(2019), https://doi.org/10.1016/j.molliq.2019.01.074
Peer review
Sí.
Keywords
Carbon Nanotubes; ionic liquid; rheology; viscoelasticity; Raman; non-Newtonian fluids.
Carbon Nanotubes
Ionic liquid
Viscoelasticity
Raman
Non-Newtonian fluids
Abstract
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 ...
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