Experimental investigations of stability, density, thermal conductivity, and electrical conductivity of solar glycol-amine-functionalized graphene and MWCNT-based hybrid nanofluids

Kim, Sung Chul; Poongavanam, Ganesh Kumar; Saravanakumar, Duraisamy; Parasuraman, Seenuvasaperumal; Meikandan, M.

doi:10.1007/s11356-021-16220-3

Cited by 17 publications

(2 citation statements)

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“…Moreover, thermal conductivity was studied as a function of temperature in the following systems: graphene-40% EG nanofluids stabilized with ionic surfactants at 30–60 °C [ 12 ], Ag-coated ZnO-EG nanofluids (no surfactant added) at 25–55 °C [ 13 ], functionalized graphene-50% EG nanofluids with or without addition of PVP at 30–70 °C [ 14 ], silica-commercial coolant based on 50% EG nanofluids at 25–65 °C [ 15 ], commercial amine-functionalized graphene multiwall CNTs—a commercial coolant based on aqueous propylene glycol nanofluid at 30–50 °C [ 16 ], and graphene oxide–magnetite–titania–EG nanofluids (no surfactant added) at 25–60 °C [ 17 ]. Several examples of studies of thermal conductivity of EG- and propylene glycol-based nanofluids as a function of temperature from the literature are collected in [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Stability of Dispersions of Amino-Functionalized Silica in Glycol and in 50–50 Aqueous Glycol

Kalbarczyk,

Skupiński,

Kosmulski

2024

Molecules

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Dispersions of amino-functionalized silica in ethylene glycol (EG) and in aqueous glycol show excellent stability at room temperature. Stability at elevated temperatures would be much desired with respect to their potential application as heat-transfer fluids. Amino-functionalized silica was dispersed in EG and in 50–50 aqueous EG by mass. HCl and acetic acid were added to enhance the positive ζ potential. The dispersions were stored at 40, 60, 80, and 100 °C for up to 28 days, and ζ potential and apparent particle radius were studied as a function of elapsed time. The particles showed a positive ζ potential in excess of 40 mV (Smoluchowski), which remained unchanged for 28 days. Such a high absolute value of ζ potential is sufficient to stabilize the dispersion against flocculation and sedimentation. The apparent particle radius in acidified dispersions was about 70 nm, and it was stable for 28 days. The particles were larger in pH-neutral dispersions. The apparent particle radius was about 80 nm in fresh dispersions and it increased on long storage at 80 and 100 °C.

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Section: Introductionmentioning

confidence: 99%

“…Amino functionalization is an alternative method to produce highly charged particles, but this method has been seldom used in EG-based heat-transfer nanofluids. Commercial amino-functionalized graphene was used as a component of heat-transfer fluids [ 16 ].…”

Section: Introductionmentioning

confidence: 99%