Thermal Conductivity Performance of 2D h-BN/MoS2/-Hybrid Nanostructures Used on Natural and Synthetic Esters

Taha‐Tijerina, Jaime; Ribeiro, Hélio; Aviña, Karla; Salguero, Jorge; Godoy, Anna Paula; Cremonezzi, Josué Marciano de Oliveira; Luciano, Milene Adriane; Benega, Marcos Antônio Gimenes; Andrade, Ricardo; Fechine, Guilhermino J. M.; Babu, Ganguli; Castro, Samuel

doi:10.3390/nano10061160

Cited by 23 publications

(18 citation statements)

References 80 publications

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“…As the nanotori filler fraction is increased within the lubricants, the nanostructures’ distance is decreased, thus increasing the contact probability among them; therefore, thermal transport channels are formed, increasing the thermal conductivity behavior due to the percolation mechanism [ 52 ]. Another important factor is the Brownian motion contribution of the carbon nanostructures [ 51 , 52 , 53 , 54 ]. For instance, an increase in the thermal conductivity of the nanolubricants can be induced by the heat transport between colliding nanostructures, particularly at higher temperatures, corresponding to more intense Brownian motion [ 55 , 56 , 57 ].…”

Section: Resultsmentioning

confidence: 99%

“…For instance, at 323 K, WB nanofluids achieved enhancements of 24, Due to the low applied nanostructures concentrations, the resulting improvements in thermal conductivity could be attributed to diverse factors, such as molecular inter-actions between the lubricants and carbon nanostructures [18,22,25,48], and percolation mechanism [49][50][51]. As the nanotori filler fraction is increased within the lubricants, the nanostructures' distance is decreased, thus increasing the contact probability among them; therefore, thermal transport channels are formed, increasing the thermal conductivity behavior due to the percolation mechanism [52]. Another important factor is the Brownian motion contribution of the carbon nanostructures [51][52][53][54].…”

Section: Resultsmentioning

confidence: 99%

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Carbon Nanotori Structures for Thermal Transport Applications on Lubricants

et al. 2021

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Carbon nanostructures have been recently applied to improve industrial manufacturing processes and other materials; such is the case for lubricants used in the metal-mechanic industry. Nanotori are toroidal carbon nanostructures, obtained from chemical treatment of multi-wall carbon nanotubes (MWCNTs). This material has been shown to have superb anti-wear and friction reduction performance, having the ability to homogeneously disperse within water in concentrations between 1–2 wt.%. Obtained results of these novel nanostructures under water mixtures and novel additives were a set point to our studies in different industrial lubricants. In the present work, nanotori structures have been applied in various filler fractions as reinforcement to evaluate the behavior in thermal transport of water-based (WB) and oil-based (OB) lubricants. Temperature-dependent experiments to evaluate the thermal conductivity were performed using a thermal water bath ranging from room temperature up to 323 K. The obtained results showed a highly effective and favorable improvement in the heat transport of both lubricants; oil-based results were better than water-based results, with nanotori structures increasing the lubricants’ thermal transport properties by 70%, compared to pure lubricant.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Carbon Nanotori Structures for Thermal Transport Applications on Lubricants

et al. 2021

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“…Taha-Tijerina et al [137] tested h-BN, molybdenum disulfide (MoS 2 ) and their combination in SE (MIDEL7131) and NE Envirotemp FR3. The measurements were focused on the enhancement of thermal conductivity.…”

Section: H-bn Nanoparticlesmentioning

confidence: 99%

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

2021

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This review is focused on the research of dielectric fluids, especially commonly used power transformer oils enhanced by nanoparticles, i.e., nanofluids. There are differences between various combinations of base fluids and nanoparticles prepared in different ways. The main goal of this review was to present recent research in this field sorted by the used nanoparticles. Nanofluids based on mineral oils, natural, or synthetic esters were investigated in terms of the nature of nanoparticles, particularly Al2O3, TiO2, Fe2O3, Fe3O4, graphene, fullerene, and others. The combinations of environmentally friendly oils and nanoparticles were presented. Finally, the article focused on the description of current dielectric fluids usable in power transformers and the possibilities of improving new and existing fluids with nanoparticles, especially their physical, dielectric, and chemical properties, but with regard to environmental aspects.

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“…In [16], using CaCu 3 Ti 4 O 12 nanoparticles at a concentration of 0.05 vol% could enhance the thermal conductivity for synthetic ester about 10% and 9% at room temperature and 80 °C, respectively. Molybdenum disulfide (MoS 2 ) and h-BN nanoparticles were also used either as individual type or as hybrid together to enhance the thermal conductivity for several commercially-type natural esters [17]. Hybrid nanostructures of h-BN/MoS 2 exhibited the highest enhancement in thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Sonication Time on Dispersion Stability, Dielectric Properties, and Heat Transfer of Graphene Based Green Nanofluids

et al. 2021

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Natural ester oils are the current target of many industries and electrical utilities as electrically insulating fluids to replace the conventional mineral oils. However, previously investigated most natural ester oils are based on edible products, causing a negative impact on the food crisis. Accordingly, nonedible green nanofluids based on cottonseed oil have been targeted in the present study. Additive graphene nanoparticles (0.0015 wt%, 0.003 wt%, 0.006 wt%, and 0.01 wt%) along with surfactant sodium dodecylbenzene sulfonate (SDBS) were used (1:1) due to their promising impact on dielectric and thermal properties. Experimental methods introduced were including characterization of graphene and preparation of dielectric nanofluids (DNFs). The main concern for any nanofluid to be usable in transformer applications is its long-term stability. The effect of various ultrasonication period (10, 20, 30 and 60minute) on short-term stability of nanofluids was preliminary investigated by visual inspection, highest short-term stability was obtained at 30-min and 60-min. Considering short-term stability results, the two most stable samples were investigated and compared for long-term stability through Ultraviolet visible (UV-Vis) spectroscopy to find the suitable ultrasonication time. In addition, dielectric and thermal properties of these samples were investigated and compared. Physical mechanisms were discussed for the obtained enhancements considering the effect of ultrasonication period on the number of dispersed nanoparticle sheets per unit volume and the corresponding effect on dielectric and thermal properties.

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Thermal Conductivity Performance of 2D h-BN/MoS2/-Hybrid Nanostructures Used on Natural and Synthetic Esters

Cited by 23 publications

References 80 publications

Carbon Nanotori Structures for Thermal Transport Applications on Lubricants

Carbon Nanotori Structures for Thermal Transport Applications on Lubricants

Dielectric Fluids for Power Transformers with Special Emphasis on Biodegradable Nanofluids

Investigation of the Effect of Sonication Time on Dispersion Stability, Dielectric Properties, and Heat Transfer of Graphene Based Green Nanofluids

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