Thermal conductivity enhancement in gold decorated graphene nanosheets in ethylene glycol based nanofluid

Mbambo, Makhangela C.; Khamliche, T.; Khumalo, Z.M.; Madiba, I.G.; Mothudi, B.M.; Mâaza, M.

doi:10.1038/s41598-020-71740-1

Cited by 26 publications

(11 citation statements)

References 41 publications

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“…This reproducible thermal conductivity enhancement was reported varying from 7 to 18% relatively to that of the host medium of C 2 H 6 O 2 or H 2 O. Recently, Mbambo et al reported an enhancement of about 33% in a multi-components nanosystem of Ag or Au grafted Graphene/C 2 H 6 O 2 based nanofluids 16 , 17 .…”

Section: Introductionmentioning

confidence: 70%

A novel approach for engineering efficient nanofluids by radiolysis

Maaza

Khamliche

Akbari

et al. 2022

Sci Rep

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This contribution reports for the first time the possibility of using radiolysis to engineer stable efficient nanofluids which exhibit an enhanced thermal conductivity. The validation was confirmed on Ag-H2O and Ag-C2H6O2 nanofluids fabricated via g-radiolysis within the mild dose range of 0.95 × 103–2.45 × 103 Gray. The enhanced thermal conductivity of Ag-H2O and Ag-C2H6O2 nanofluids, was found to be g-radiations dose dependent. In the latter case of Ag-C2H6O2 nanofluid, the relative enhancement in the temperature range of 25–50 °C was found to be 8.89%, 11.54%, 18.69%, 23.57% and 18.45% for D1 = 0.95 × 103 Gray, D2 = 1.2 × 103 Gray, D3 = 1.54 × 103 Gray, D4 = 1.80 × 103 Gray and D5 = 2.45 × 103 Gray respectively. Yet not optimized, an enhancement of the effective thermal conductivity as much as 23.57% relatively to pure C2H6O2 was observed in stable Ag-C2H6O2 nanofluids. Equivalent results were obtained with Ag-H2O.

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Section: Introductionmentioning

confidence: 70%

A novel approach for engineering efficient nanofluids by radiolysis

Maaza

Khamliche

Akbari

et al. 2022

Sci Rep

Self Cite

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“…The experimental data related to this hybrid nanofluid indicated 27% and 45% enhancements in thermal conductivity at high temperatures with EG base fluid and deionized (DI) water. 49 In another study, GNs–Au NPs hybrid nanofluid was synthesized by Mbambo 50 in ethylene glycol and the thermal conductivity was enhanced up to 26% in the range of 25–45 °C. Thus, Au (301 W m −1 K −1 ) and GO (2000–5000 W m −1 K −1 ) NPs with varying thermal conductivities were able to generate considerable thermal properties through addition to the water base fluids.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and optimization of the thermal conductivity enhancement of a water-based GO nanosheets/Au NPs hybrid nanofluid: Box-Behnken design

et al. 2022

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“…The results demonstrated the potential for useful applications in heat transfer systems by emphasizing the notable increases in thermal conductivity obtained by adding these nanoplatelets to the fluid. Mbambo et al [15] investigated the increase in thermal conductivity in nanofluids that contained graphene nanosheets coated with gold and distributed in ethylene glycol. They provided details on the mechanics behind the increased thermal conductivity and offered suggestions for possible uses of these nanofluids in energy and thermal management systems.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of stearic acid/bismuth oxychloride/cupric oxide for thermal storage applications: preparation, stability, rheological and thermophysical analysis

Singh

et al. 2024

Phys. Scr.

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The present study reports the preparation of nanophase change materials (NPCMs) using a two-step method with an optimized ratio of 0.5 wt.% of nanoparticles for thermal storage applications. Bismuth oxychloride (BiOCl), cupric oxide (CuO), and a mixture of BiOCl/CuO (composite) were used as nanoparticles, and stearic acid was used as the PCM. The crystallography, chemical/functional groups and morphologies of the prepared NPCMs have been analysed by XRD, FT-IR and SEM, respectively. Observations revealed that the presence of nanoparticles in NPCMs did not affect crystal formation or chemical disruption of molecular interactions. TGA was used to analyse the thermal stability and rate of deterioration of the NPCMs. The deterioration of the PCM occurs at 243℃ with a weight loss of 1.3% while 0.5 wt.% concentrated BiOCl, CuO, and composite NPCMs exhibit weight losses of 1.8%, 2.3%, and 3.4%, respectively at 257℃, 262℃ and 258℃. In the DSC study, the phase-changing attributes of the NPCMs manifested in the onset temperature range between 53.4°C and 59.8°C. The potential enthalpy of the PCM is 209.1 kJ/kg, whereas those of the 0.5 wt.% concentrated BiOCl, CuO, and composite NPCMs are 204.6, 198.3, and 201.7 kJ/kg, respectively. However, the enhanced thermal conductivities of 0.5 wt.% concentrated BiOCl, CuO, and the composite NPCMs are 0.18, 0.22, and 0.20 W/(m.℃), respectively, which are 5.9%, 29.4% and 17.6% greater than that of PCM. Additionally, the congruent melting rate increased by 31% for 0.5 wt.% CuO concentrated NPCM; therefore, it is a potential candidate than other NPCMs/PCM. Cyclic tests were conducted to assess the reliability of the NPCMs, and compatible results were obtained even after 500 cycles. The findings of this work indicate that all the prepared NPCMs could be a viable option for practical applications, including thermal comfort buildings, solar heating, and electronic cooling.

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Thermal conductivity enhancement in gold decorated graphene nanosheets in ethylene glycol based nanofluid

Cited by 26 publications

References 41 publications

A novel approach for engineering efficient nanofluids by radiolysis

A novel approach for engineering efficient nanofluids by radiolysis

Evaluation and optimization of the thermal conductivity enhancement of a water-based GO nanosheets/Au NPs hybrid nanofluid: Box-Behnken design

Synergistic effect of stearic acid/bismuth oxychloride/cupric oxide for thermal storage applications: preparation, stability, rheological and thermophysical analysis

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