Physicochemical characterisation of graphene-ammonium lactate ionic liquid nanofluid
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Martínez Rubio, Pablo Manuel; Avilés, María Dolores; Arias Pardilla, Joaquín; Carrión Vilches, Francisco José; Sanes Molina, José; [et al.]Grupo de investigación
Grupo de Ciencia de Materiales e Ingeniería MetalúrgicaÁrea de conocimiento
Ciencia de los Materiales e Ingeniería MetalúrgicaPatrocinadores
The authors acknowledge the financial support of Ministerio de Economía y Competitividad and Agencia Estatal de Investigación (MINECO and AEI, Spain), EU-FEDER (MAT2017-85130-P, and PID2021-122169NB) and the Fundación Seneca, Agencia de Ciencia y Tecnología de la Región de Murcia (‘Ayuda a las Unidades y Grupos de Excelencia Científica de la Región de Murcia’; Grant # 19877/GERM/15). P.M. M.-R. is grateful to Fundación Séneca for FPI research grant (21574/FPI/21).Realizado en/con
Universidad Politécnica de CartagenaFecha de publicación
2022-09-29Editorial
ElsevierCita bibliográfica
MARTÍNEZ-RUBIO, Pablo Manuel, et al. Physicochemical characterisation of graphene-ammonium lactate ionic liquid nanofluid. Journal of Molecular Liquids, 2022, vol. 367, p. 120446. https://doi.org/10.1016/j.molliq.2022.120446.Revisión por pares
SIPalabras clave
GrapheneIonic liquids
Rheology
Conductivity
Resumen
A new series of nanofluids based on graphene dispersed in 2-hydroxyethylammonium lactate (ML) ionic liquid was developed. Concentrations of 0.1, 0.5 and 1 wt% of graphene were studied and these dispersions were stable after 2 months. Raman spectra showed a strong interaction between ML and graphene. The effect of the concentration of graphene and temperature on the viscoelastic behaviour and conductivity of the nanofluids was studied. An unexpected decrease in the viscosity was found with a low concentration of graphene due to the suppression of hydrogen bonding of the ionic liquid. Shear thinning effects appeared with higher concentrations of graphene and Ostwald and Herschel-Bulkley equations were used to describe the steady-state viscosity results. Creep-recovery tests were also performed, and the data were fitted to a complex Burgers model for the nanofluid with 1 wt% of graphene, with a 47 % of elastic response. The complexity of the model was related to the presence of different ...
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