Synthesis of graphene encased alumina and its application as nanofluid for cooling of heat-generating electronic devices

Selvaraj, Vishnuprasad; Haribabu, K.

doi:10.1016/j.powtec.2020.01.050

Cited by 39 publications

(17 citation statements)

References 33 publications

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“…Uncertainty analysis of all measured data was conducted to confirm the reliability of the experiments as reported in our previous work [26]. The experimental parameters and uncertainties given in Tab.…”

Section: Uncertainty Analysismentioning

confidence: 68%

“…When the suspension begings to become acidic, the concentration of hydrogen (H + ) ions in the nanofluid rises. The increase in positively charged ions in the bielectric layer on the surface of graphene nanoparticles raises the zeta potential in a positive direction, whereas under alkaline conditions the hydronium (OH -) ions get settled on the bielectric layer around the graphene, which reduces the zeta potential value in a negative direction [26].…”

Section: Properties Of Functionalized Graphene Nanofluids 321 Dispementioning

confidence: 99%

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Covalent Functionalization of Graphene for the Enhancement of Thermophysical Properties in Nanofluids

2021

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Covalent functionalization of graphene nanoparticles by autoclave, reflux-condensation, and microwave-assisted methods was performed. Nanofluids prepared by acidic functionalized graphene exhibit a higher dispersion stability than raw graphene. The thermal conductivity of nanofluids obtained by the microwaveassisted method was higher than with other functionalization methods, and a signifcant maximum thermal conductivity enhancement compared to deionized water was achieved. Microwave-assisted thermochemical synthesis is a highly effective energy-saving method over other conventional approaches.

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Section: Uncertainty Analysismentioning

confidence: 68%

Section: Properties Of Functionalized Graphene Nanofluids 321 Dispementioning

confidence: 99%

Covalent Functionalization of Graphene for the Enhancement of Thermophysical Properties in Nanofluids

2021

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“…In electronic cooling applications, Selvaraj et al [ 6 ] studied nanofluids made of graphene nanocomposites and Al

. The authors found a maximum thermal conductivity increase of 45%, and maximum increases in the dimensionless Nusselt number (Nu) and the coefficient of convective heat transfer of 16% and 51.7%, respectively, with a concentration of 0.2 vol.%.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ag-Decoration on rGO/Water Nanofluid Thermal Conductivity and Viscosity

et al. 2022

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Carbon-based nanomaterials have a high thermal conductivity, which can be exploited to prepare nanofluids. Graphene is a hydrophobic substance, and consequently, graphene-based nanofluid stability is improved by adding surfactants. An attractive alternative is the decoration of reduced graphene oxide (rGO) with metallic materials to improve the thermal conductivity without affecting the stability of nanofluids. This study focuses on the synthesis and characterization of rGO/Ag (0.1 wt.%) aqueous nanofluids. Moreover, the effects of the Ag concentration (0.01–1 M) on the thermal conductivity and viscosity during the synthesis of rGO/Ag composite are analyzed. The nanofluid thermal conductivity showed increases in relation to the base fluid, the most promising being 28.43 and 26.25% for 0.1 and 1 M of Ag, respectively. Furthermore, the nanofluids were Newtonian in the analyzed range of shear rates and presented a moderate increase (<11%) in viscosity. Aqueous nanofluids based on rGO/Ag nanocomposites are a potential alternative for applications as heat transfer fluids.

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“…The authors indicated that the thermal conductivity reached a maximum improvement of 32% with 1.0 wt.% at 40

C and described nonlinear behavior for temperature and concentration. Selvaraj et al [ 25 ] studied the behavior of nanofluids based on nanocomposites of graphene and Al

. The authors reported an increase in thermal conductivity, Nusselt number and heat transfer coefficient of 45%, 16% and 51.7%, respectively, with a concentration of 0.2 vol.%.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Rheological Characterization of Aqueous Nanofluids Based on Reduced Graphene Oxide (rGO) with Manganese Dioxide Nanocomposites (MnO2)

Lozano-Steinmetz

Ramírez-Navarro

Vivas³

et al. 2022

Nanomaterials

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Nanofluids have become of interest in recent years thanks to their improved thermal properties, which make them especially interesting for microchannel heat sink applications. In this study, we prepared two aqueous nanofluids based on reduced graphene oxide (rGO) decorated with manganese dioxide (MnO2) at a concentration of 0.1 wt.%. The difference between the two nanofluids was in the preparation of the reduced graphene oxide decorated with MnO2. In the first case, the manganese salt was mixed with ascorbic acid before GO reduction with NaOH, and in the second case, the GO reduction with NaOH occurred under ascorbic acid. Ascorbic acid not only plays the role of a non-toxic and ecofriendly reducing agent but also acts as an important parameter to control the reaction kinetics. The structural, microstructural and spectral characterizations of the MnO2/rGO nanocomposite were conducted via X-ray diffractometry (XRD), Raman spectroscopy, FT-IR, TEM, SEM and EDS analyses. Moreover, the synthesized MnO2/rGO nanocomposites were utilized as nanofluids and their stability, thermal conductivity and rheological behaviors were studied. The thermal conductivity of the MnO2/rGO and MnO2AsA/rGO nanofluids was 17% and 14.8% higher than that of water for the average temperature range, respectively, but their viscosity remained statistically equal to that of water. Moreover, both nanofluids presented Newtonian behavior in the analyzed shear rate range. Therefore, both MnO2/rGO and MnO2AsA/rGO nanofluids are promising alternatives for use in applications with micro- and millichannel heat sinks.

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Synthesis of graphene encased alumina and its application as nanofluid for cooling of heat-generating electronic devices

Cited by 39 publications

References 33 publications

Covalent Functionalization of Graphene for the Enhancement of Thermophysical Properties in Nanofluids

Covalent Functionalization of Graphene for the Enhancement of Thermophysical Properties in Nanofluids

The Effect of Ag-Decoration on rGO/Water Nanofluid Thermal Conductivity and Viscosity

Thermal and Rheological Characterization of Aqueous Nanofluids Based on Reduced Graphene Oxide (rGO) with Manganese Dioxide Nanocomposites (MnO2)

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