Graphene-silver alloyed quantum dots nanofluid: Synthesis and application in the cooling of a simulated electronic system

Selvaraj, Vishnuprasad; Haribabu, K.

doi:10.1016/j.applthermaleng.2021.116580

Cited by 16 publications

(2 citation statements)

References 42 publications

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“…A maximum thermal conductivity enhancement of 28.29 % and 23.82 % was obtained for 3 vol % Al 2 O 3 loading and 0.1 vol % Al 2 O 3 /Ag loading which indicated that hybrid nanofluid showed good thermal conductivity enhancement at a lower loading in comparison to Al 2 O 3 nanofluid alone. By using an in-situ hydrothermal approach, Selvaraj et al [35] prepared graphene-silver alloyed quantum dots which were dispersed in de-ionized water for producing Nanofluid at various concentrations (200-1200 ppm). The prepared Nanofluid exhibited high dispersion stability at pH 7.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of in situ Generated Cu−CNT Hybrid Nanofluid and the Study of Their Thermo‐physical Properties

Gupta

Sharma

2023

ChemistrySelect

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In recent years, numerous investigations have been carried out in heat transfer applications for CNT nanofluid as it possesses a high thermal conductivity compared to conventional fluids. Hydrophobicity of CNT poses a challenge to disperse CNT in polar basefluid. Surfactants can solve this issue up to a certain extent only but have some associated disadvantages such as foam formation, stickiness and viscosity enhancement responsible for an increase in power required to pump Nanofluid in heat transfer devices. This work presents preparation of a hybrid nanofluid as an alternative. Cu−CNT hybrid nanoparticles were generated in this research using in‐situ preparation of Cu nanoparticles in the presence of CNT and dispersion in double distilled water without addition of surfactant to produce a stable nanofluid. FESEM with EDX confirms copper nanoparticles present on outer surface of MWCNT and Raman spectroscopy confirmed the covalent functionalization. Spectral analysis, Zeta potential, and DLS were used to evaluate the dispersibility of Cu−CNT hybrid nanofluid. The results showed that the samples were extremely stable, with maximum stability of about 168 days. XRD pattern of Cu−CNT hybrid nanoparticles confirmed the existence of Cu and CNT. Nanofluid demonstrated a minor increase in density and viscosity compared to basefluid water due to addition of nanoparticles. An increase in thermal conductivity was also observed, which is critical for heat transfer applications.

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Section: Introductionmentioning

confidence: 99%

Synthesis of in situ Generated Cu−CNT Hybrid Nanofluid and the Study of Their Thermo‐physical Properties

Gupta

Sharma

2023

ChemistrySelect

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“…The exergetic and energetic efficiencies can also be boosted with the rising weight and mass fraction of MWCNT while analyzing the exergy and energy of solar collectors using nanofluid, [20]. In another study, a quantum dot nanofluid was prepared to explore a customized electronic system's cooling capability when graphene-silver quantum dots were synthesized using silver nitrate and citric acid, [21]. The prepared 1200 ppm nanofluid revealed excellent stability in terms of higher zeta potential value (-49 mV), maintaining a neutral pH value while the thermal conductivity improved significantly (46%).…”

Section: Introductionmentioning

confidence: 99%

Exploring Surfactant-Enhanced Stability and Thermophysical Characteristics of Water-Ethylene Glycol-Based Al2O3-TiO2 Hybrid Nanofluids

Urmi,

Rahman,

Kadirgama

et al. 2023

1790-5044

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This study presents an empirical investigation into the impact of surfactant's enhanced stability and thermophysical characteristics of water-ethylene glycol (60:40) based Al2O3-TiO2 hybrid nanofluids. It aims to shed light on the nanofluid's behavior, mainly how surfactants affect its stability and thermal performance, thus contributing to advancements in heat transfer technology and engineering applications. The growing interest in nanofluids, which involves blending nanoparticles with conventional base fluids, spans diverse sectors like solar energy, heat transfer, biomedicine, and aerospace. In this study, Al2O3 and TiO2 nanoparticles are evenly dispersed in a DI-water and ethylene glycol mixture using a 50:50 ratio with a 0.1 % volume concentration. Three surfactants (SDS, SDBS, and PVP) are utilized to investigate the effect of the surfactants on hybrid nanofluids. The study examines the thermophysical characteristics of these hybrid nanofluids across a temperature range of 30 to 70 0C in 20 0C intervals to understand their potential in various industrial applications. The results show the highest stability period for nanofluids with PVP compared to nanofluids with surfactant-free and other surfactants (SDS, SDBS). The thermal conductivity is slightly decreased (max 4.61%) due to PVP surfactant addition compared to other conditions. However, the nanofluids with PVP still exhibit more excellent thermal conductivity value than the base-fluid and significantly reduced viscosity (max 55%). Hence, the enhanced thermal conductivity and reduced viscosity with improved stability due to PVP addition significantly impact heat transfer performance. However, the maximum thermal conductivity was obtained for surfactant-free Al2O3-TiO2/Water-EG-based hybrid nanofluids that reveal a thermal conductivity that is 17.05 % higher than the based fluid. Instead, the lower viscosity of hybrid nanofluids was obtained at 70 0C with the addition of PVP surfactant. Therefore, adding surfactants positively impacts Al2O3-TiO2/Water-EG-based hybrid nanofluids with higher stability, enhancing thermal conductivity and reducing viscosity compared to the based fluids. The results show that adding surfactants at a fixed volume concentration affects thermal conductivity at low temperatures and viscosity at high temperatures, suggesting that these fluids might be used as cooling agents to increase pumping power in industrial applications.

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A CFD modeling of CPU cooling by eco-friendly nanofluid and fin heat sink passive cooling techniques

Siahchehrehghadikolaei¹,

Gholinia²,

Ghadikolaei³

et al. 2022

Advanced Powder Technology

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Graphene-silver alloyed quantum dots nanofluid: Synthesis and application in the cooling of a simulated electronic system

Cited by 16 publications

References 42 publications

Synthesis of in situ Generated Cu−CNT Hybrid Nanofluid and the Study of Their Thermo‐physical Properties

Synthesis of in situ Generated Cu−CNT Hybrid Nanofluid and the Study of Their Thermo‐physical Properties

Exploring Surfactant-Enhanced Stability and Thermophysical Characteristics of Water-Ethylene Glycol-Based Al2O3-TiO2 Hybrid Nanofluids

A CFD modeling of CPU cooling by eco-friendly nanofluid and fin heat sink passive cooling techniques

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