Characterization of Al2O3, TiO2, hybrid Al2O3-TiO2 and graphene oxide nanofluids and their performance evaluations in photovoltaic thermal system

Rubaiee, Saeed; Yahya, Syed Mohd; Fazal, M. A.; Danish, Mohd

doi:10.1007/s10973-023-12492-8

Cited by 2 publications

(1 citation statement)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The term “thermal stability” in this paper refers to an operation range of nanofluids; that is, to the temperatures below their boiling points. This semantic detail has to be explained, because several authors have used the term “thermal stability” for thermogravimetric analysis of nanofluids based on aqueous EG up to several hundred °C [ 28 ]. Obviously, the solvent evaporated below 200 °C.…”

Section: Introductionmentioning

confidence: 99%

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

Kalbarczyk,

Skupiński,

Kosmulski

2024

Molecules

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%