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Modification of the raman spectra in graphene-based nanofluids and its correlation with thermal properties
Rodríguez Laguna, María del Rocío (Institut Català de Nanociència i Nanotecnologia)
Gómez Romero, Pedro (Institut Català de Nanociència i Nanotecnologia)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)

Date: 2019
Abstract: It is well known that by dispersing nanoparticles in a fluid, the thermal conductivity of the resulting nanofluid tends to increase with the concentration of nanoparticles. However, it is not clear what the mechanism behind this phenomenon is. Raman spectroscopy is a characterization technique connecting the molecular and macroscopic world, and therefore, it can unravel the puzzling effect exerted by the nanomaterial on the fluid. In this work, we report on a comparative study on the thermal conductivity, vibrational spectra and viscosity of graphene nanofluids based on three different amides: N, N-dimethylacetamide (DMAc); N, N-dimethylformamide (DMF); and N-methyl-2-pyrrolidinone (NMP). A set of concentrations of highly stable surfactant-free graphene nanofluids developed in-house was prepared and characterized. A correlation between the modification of the vibrational spectra of the fluids and an increase in their thermal conductivity in the presence of graphene was confirmed. Furthermore, an explanation of the non-modification of the thermal conductivity in graphene-NMP nanofluids is given based on its structure and a peculiar arrangement of the fluid.
Note: Altres ajuts: CERCA Programme/ Generalitat de Catalunya
Note: Número d'acord de subvenció MINECO/SEV-2017-0706
Note: Número d'acord de subvenció MINECO/MAT2015-68394-R
Note: Número d'acord de subvenció MINECO/FIS2015-70862-P
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Language: Anglès.
Document: article ; recerca ; publishedVersion
Subject: Raman of nanofluids ; Enhancement of thermal conductivity ; Nanofluids ; Graphene
Published in: Nanomaterials, Vol. 9, Issue 5 (May 2019) , art. 804, ISSN 2079-4991

DOI: 10.3390/nano9050804
PMID: 31130687


12 p, 1.9 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2019-09-02, last modified 2019-10-22



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