Synthesis and thermo-physical properties of deep eutectic solvent-based graphene nanofluids

Y. K. Fang, M. Osama, W. Rashmi, K. Shahbaz, M. Khalid, F. S. Mjalli, M. M. Farid

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This study introduces a new class of heat transfer fluids by dispersing functionalised graphene oxide nanoparticles (GNPs) in ammonium and phosphonium-based deep eutectic solvents (DESs) without the aid of a surfactant. Different molar ratios of salts and hydrogen bond donors (HBD) were used to synthesise DESs for the preparation of different concentrations of graphene nanofluids (GNFs). The concentrations of GNPs were 0.01 wt%, 0.02 wt% and 0.05 wt %. Homogeneous and stable suspensions of nanofluids were obtained by high speed homogenisation and an ultrasonication process. The stability of the GNFs was determined through visual observation for 4 weeks followed by a centrifugal process (5000-20 000 rpm) for 30 min in addition to zeta potential studies. Dispersion of the GNPs in DES was observed using an optical microscope. The synthesised DES-based GNFs showed no particle agglomeration and formation of sediments in the nanofluids. Thermo-physical properties such as thermal conductivity and specific heat of the nanofluids were also investigated in this research. The highest thermal conductivity enhancement of 177% was observed. The findings of this research provide a new class of engineered fluid for heat transfer applications as a function of temperature, type and composition DESs as well as the GNPs concentration.

Original languageEnglish
Article number075702
JournalNanotechnology
Volume27
Issue number7
DOIs
Publication statusPublished - Jan 14 2016

Fingerprint

Graphite
Eutectics
Graphene
Thermodynamic properties
Oxides
Nanoparticles
Thermal conductivity
Heat transfer
Fluids
Zeta potential
Ammonium Compounds
Surface-Active Agents
Specific heat
Suspensions
Hydrogen bonds
Sediments
Microscopes
Surface active agents
Agglomeration
Salts

Keywords

  • deep eutectic solvents
  • graphene
  • nanofluids
  • stability
  • thermal conductivity

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Synthesis and thermo-physical properties of deep eutectic solvent-based graphene nanofluids. / Fang, Y. K.; Osama, M.; Rashmi, W.; Shahbaz, K.; Khalid, M.; Mjalli, F. S.; Farid, M. M.

In: Nanotechnology, Vol. 27, No. 7, 075702, 14.01.2016.

Research output: Contribution to journalArticle

Fang, Y. K. ; Osama, M. ; Rashmi, W. ; Shahbaz, K. ; Khalid, M. ; Mjalli, F. S. ; Farid, M. M. / Synthesis and thermo-physical properties of deep eutectic solvent-based graphene nanofluids. In: Nanotechnology. 2016 ; Vol. 27, No. 7.
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