Preparation and Characterization of Graphene Nanoplatelets Nanofluids in the Presence of Polyethylene Glycol-Derived Polyhedral Oligomeric Silsesquioxane

In this study, rheological and thermophysical properties of water-based and ethylene glycol (EG)-based graphene nanoplatelets (GNP) nanofluids were compared. Ultrasound-assisted preparation of aqueous and EG-based GNP nanofluids at high nanoparticle concentrations was performed in the presence of po...

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Bibliographic Details
Published in:International journal of thermophysics 2022-05, Vol.43 (5), Article 75
Main Authors: Fidan-Aslan, Tugce, Alyamac-Seydibeyoglu, Elif
Format: Article
Language:English
Subjects:
Classical Mechanics
Condensed Matter Physics
Geophysics
Graphene
Heat conductivity
Heat transfer
Industrial Chemistry/Chemical Engineering
Measuring instruments
Nanofluids
Nanoparticles
Physical Chemistry
Physics
Physics and Astronomy
Polyethylene glycol
Polyhedral oligomeric silsesquioxane
Rheological properties
Spectrophotometry
Stability analysis
Surface stability
Surface tension
Thermal conductivity
Thermodynamics
Thermophysical properties
Zeta potential
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Summary:In this study, rheological and thermophysical properties of water-based and ethylene glycol (EG)-based graphene nanoplatelets (GNP) nanofluids were compared. Ultrasound-assisted preparation of aqueous and EG-based GNP nanofluids at high nanoparticle concentrations was performed in the presence of polyethylene glycol-derived polyhedral oligomeric silsesquioxane (PEG-POSS) as a stabilizer, for the first time in literature. Ultraviolet–visible (UV–Vis) spectrophotometry and zeta potential measuring device (Zetasizer Nano) were employed for the evaluation of stability performance of the nanofluids. Surface tension values of the nanofluids were measured by pendant drop method. The inclusion of PEG-POSS resulted in surface tension reduction up to 4.5% for aqueous nanofluids, whereas the surface tension of EG-based nanofluids increased up to 11.5%. The highest thermal conductivity enhancement of 32% was measured for EG-based 2.0 wt% GNP nanofluids, using 3ω method. The results suggest that the addition of PEG-POSS as a stabilizer improved the thermal conductivity of EG-based GNP nanofluids significantly.
ISSN:0195-928X
1572-9567
DOI:10.1007/s10765-022-03002-3