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Potential mechanisms responsible for the enhancement of thermal properties in graphene nanofluids

AuthorsRodríguez-Laguna, María del Rocío ; Castro-Alvarez, A.; Sledzinska, Marianna ; Maire, Jeremie; Costanzo, Francesca; Ensing, Bernd; Pruneda, Miguel ; Ordejón, Pablo ; Sotomayor Torres, C. M. ; Gómez-Romero, P. ; Chávez, Emigdio
Enhancement of thermal properties
π-π stacking
Liquid layering
Issue Date2019
PublisherUniversidad Jaume I
CitationConference Proceedings: 1st International Conference on Nanofluids (ICNf), 2nd European Symposium on Nanofluids (ESNf): 393-395 (2019)
AbstractHighly stable graphene nanofluids based on N,N-dimethylacetamide and N,Ndimethylformamide were prepared and thermally characterized. The thermal conductivity and specific heat capacity of both nanofluids suffered a dramatic enhancement with increasing graphene concentration. Raman spectroscopy showed a blue shift of certain Raman modes with increasing graphene concentration. This finding indicates that graphene affects the whole liquid in terms of vibrational energy. Furthermore, DFT and MD simulations showed that the liquid molecules tend to lay parallel towards graphene, favouring a possible π-π stacking. In addition, it was observed that graphene induces a local order of liquid molecules close to the flake. All these data are discussed in the paper to attempt to shed light on the mechanisms behind the enhancement of thermal transport in graphene nanofluids.
DescriptionTrabajo presentado a la 1st International Conference on Nanofluids (ICNf) y 2nd European Symposium on Nanofluids (ESNf), celebrados en Castellón (España) del 26 al 28 de Junio de 2019.
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