Experimental study on thermal conductivity and electrical conductivity of diesel oil-based nanofluids of graphene nanoplatelets and carbon nanotubes

Naddaf, Atiyeh; Heris, Saeed Zeinali

doi:10.1016/j.icheatmasstransfer.2018.05.004

Cited by 134 publications

(41 citation statements)

References 27 publications

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“…As noted earlier, this is a consequence of improving the quality of mixture formation and combustion. As a result, a decrease in combustion temperature and a reduction in combustion duration are achieved, which leads to a decrease in the NO x emission [23][24][25][26].…”

Section: Discussionmentioning

confidence: 99%

Study on the Possibility of Improving the Environmental Performance of Diesel Engine Using Carbon Nanotubes as a Petroleum Diesel Fuel Additive

et al. 2019

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The relevance of this article is due to the need for improving indicators of exhaust gas toxicity of diesel engines. One of the modern directions of achieving the required environmental performance of diesel engines is the addition of various nanomaterials to petroleum diesel fuel. The aim of the present study was to investigate the possibility of improving the environmental performance of a diesel engine for a generator set using carbon nanotubes as an additive to petroleum diesel fuel in an amount of up to 500 mg/L. Experimental studies were carried out on a D-243 diesel engine operating in a wide range of loads from idle to full load with the addition of 125, 250, and 500 mg/L of carbon nanotubes in the diesel fuel. The mixing of petroleum diesel fuel with nanotubes was done using an ultrasonic unit. The possibility of improving the environmental performance of the studied diesel engine fueled with carbon nanotube-blended petroleum diesel fuel was examined. Results showed that, in the full-load mode of diesel operation, the addition of 500 mg/L of carbon nanotubes to diesel fuel enabled the engine to reduce exhaust smoke from 26.0% to 11.2% on the Hartridge scale.

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Section: Discussionmentioning

confidence: 99%

Study on the Possibility of Improving the Environmental Performance of Diesel Engine Using Carbon Nanotubes as a Petroleum Diesel Fuel Additive

et al. 2019

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“…The synergistic effects of electrical and thermal properties have been pursued by combinations of One-dimensional CNTs and twodimensional graphene [9][10][11][12][13]. There are many potential applications in various fields based on these synergistic effects, such as GR/CNTs hybrid aerogels [14,15] and GR/CNTs hybrid materials for thermal management [16,17].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of electrical and thermal properties of graphene by aligned carbon nanotubes

Guo

et al. 2020

Mater. Res. Express

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In order to explore the composite effects of graphene (GR) and carbon nanotubes (CNTs), GR/CNTs aerogels and GR/CNTs coatings were fabricated. Aligned carbon nanotubes (ACNTs) and twining carbon nanotubes (TCNTs) were comparatively examined by integrating them with graphene, which has seldom been studied in detail. Freeze drying was novelly adopted to retain the liquid distribution in GR/CNTs mixture. Fourier Transform Infrared Spectroscopy (FTIR) analysis demonstrated that OH group and carboxylic acid groups were effectively induced onto CNTs via chemical modification. Scanning electron microscopy (SEM) showed that ACNTs achieved better dispersion and homogeneity in graphene than TCNTs. GR/CNTs hybrid composite with various loading of ACNTs or TCNTs were examined by electrical/thermal conductivity tests and practically evaluated for thermal management in LEDs. Results revealed that the electrical and thermal properties of graphene can be dramatically enhanced by the proper addition of ACNTs due to the formation of effective conductive bridges. The GR/ACNTs aerogel with 10 wt% ACNTs attained a high electrical conductivity of 2.08×10 4 S m −1 , elevated to 2.76×10 4 S m −1 after annealing treatment. The ecofriendly and low-cost GR/ACNTs coating with 10 wt% ACNTs prominently reduced the operating temperature of LEDs by 8.6°C, acting as potential thermal management materials in practical applications.

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“…However, the distribution and alignment of nanoscale carbon-based materials (e.g., graphene and carbon nanotubes, etc.) remain big challenge to researchers, limiting the content of conductive fills in composites [21]. Diamond/metal matrix composites draw much attention due to excellent thermal properties, with isotropic TC approaching 600 W/(m•K) [22].…”

Section: Introductionmentioning

confidence: 99%

High Thermal Conductivity and Anisotropy Values of Aligned Graphite Flakes/Copper Foil Composites

Zeng

Xue

et al. 2019

Materials

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Much attention has been paid to graphite flakes/copper (GFs/Cu) composites for thermal management due to their remarkable thermal properties. Most studies focus on the interface interaction between GFs and Cu in composites. However, controlling the orientation of GFs still remains a challenge. Herein, we report a reliable method to ensure consistent orientation of GFs in the composites. Firstly, the disorder GFs were well arranged on the surface of copper foil by tape casting process in the casting machine. Then highly aligned GFs/Cu composites were fabricated by hot pressing process in a vacuum hot-pressing furnace, with the volume fraction of graphite from 30% to 70%. The SEM images show that the obtained GFs/Cu composites presented a layer-by-layer structure or network structure with a different content of GFs. The thermal conductivity of GFs/Cu composites exhibited an extreme anisotropy due to the highly aligned GFs. The ultrahigh thermal conductivity of GFs/Cu composites with 70 vol% GFs reached 741 W/(m·K), while through-plane thermal conductivity was just 42 W/(m·K). The alignment of GFs and interfacial thermal resistance were deeply analyzed and a thermal conductivity model for GFs/Cu composites was established. Our work provides a new idea to significantly enhance the thermal transportation performance of GFs/Cu composites by well controlled alignment of GFs in Cu matrix.

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Experimental study on thermal conductivity and electrical conductivity of diesel oil-based nanofluids of graphene nanoplatelets and carbon nanotubes

Cited by 134 publications

References 27 publications

Study on the Possibility of Improving the Environmental Performance of Diesel Engine Using Carbon Nanotubes as a Petroleum Diesel Fuel Additive

Study on the Possibility of Improving the Environmental Performance of Diesel Engine Using Carbon Nanotubes as a Petroleum Diesel Fuel Additive

Enhancement of electrical and thermal properties of graphene by aligned carbon nanotubes

High Thermal Conductivity and Anisotropy Values of Aligned Graphite Flakes/Copper Foil Composites

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