Fang, Y.K., Osama, M., Rashmi, W., Shahbaz, K., Khalid, M., Mjalli, F.S., and Farid, M.M. (2016) Synthesis and thermo-physical properties of deep eutectic solvent-based graphene nanofluids. Nanotechnology, 27. 075702.

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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.

Item ID:	86799
Item Type:	Article (Research - C1)
ISSN:	0957-4484
Copyright Information:	© 2016 IOP Publishing Ltd
Date Deposited:	27 Oct 2025 23:38
FoR Codes:	40 ENGINEERING > 4004 Chemical engineering > 400402 Chemical and thermal processes in energy and combustion @ 100%
SEO Codes:	17 ENERGY > 1701 Energy efficiency > 170199 Energy efficiency not elsewhere classified @ 100%
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