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Preparation and characterization of carbon nanofluid by a plasma arc nanoparticles synthesis system.

Teng TP, Cheng CM, Pai FY - Nanoscale Res Lett (2011)

Bottom Line: The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM.The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water.The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Industrial Education, National Taiwan Normal University, No, 162, Sec, 1, He-ping E, Rd,, Da-an District, Taipei City 10610, Taiwan. tube5711@ntnu.edu.tw.

ABSTRACT
Heat dissipation from electrical appliances is a significant issue with contemporary electrical devices. One factor in the improvement of heat dissipation is the heat transfer performance of the working fluid. In this study, we used plasma arc technology to produce a nanofluid of carbon nanoparticles dispersed in distilled water. In a one-step synthesis, carbon was simultaneously heated and vaporized in the chamber, the carbon vapor and particles were then carried to a collector, where cooling furnished the desired carbon/water nanofluid. The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM. Crystal morphology was examined by XRD. Finally, the characterization include thermal conductivity, viscosity, density and electric conductivity were evaluated by suitable instruments under different temperatures. The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water. The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

No MeSH data available.


Related in: MedlinePlus

Schematic diagram of the synthesis system for carbon/water nanofluid. (a) The synthesis system for carbon/water nanofluid. (b) The vaporization chamber in the synthesis system.
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Figure 1: Schematic diagram of the synthesis system for carbon/water nanofluid. (a) The synthesis system for carbon/water nanofluid. (b) The vaporization chamber in the synthesis system.

Mentions: The carbon/water nanofluid in this study was prepared by the plasma arc system [19], which belongs to one-step synthesis system. Figure 1 shows a schematic layout of the carbon/water nanofluid synthesis. Plasma arc welding equipment (400 GTS, Thermal Arc, Thermadyne, St. Louis, MO, USA) provided the heat source, and a vaporization chamber, cooling system, and collection system completed the system. The plasma arc provided the extreme high temperature inside the vaporization chamber, which melted and evaporated the graphite rods. Using this setup, we could control for working current, pulse frequency, and plasma gas and argon (Ar) carrier-gas flow rates. The pressure differential produced between the vaporization chamber and collection chamber induces vaporized carbon to move into the collection chamber. The nanofluid collection system and cooling system pre-cools distilled water to maintain a constant 3-5°C during the collection of nanofluid and to further suppress excess particle growth and clustering.


Preparation and characterization of carbon nanofluid by a plasma arc nanoparticles synthesis system.

Teng TP, Cheng CM, Pai FY - Nanoscale Res Lett (2011)

Schematic diagram of the synthesis system for carbon/water nanofluid. (a) The synthesis system for carbon/water nanofluid. (b) The vaporization chamber in the synthesis system.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211359&req=5

Figure 1: Schematic diagram of the synthesis system for carbon/water nanofluid. (a) The synthesis system for carbon/water nanofluid. (b) The vaporization chamber in the synthesis system.
Mentions: The carbon/water nanofluid in this study was prepared by the plasma arc system [19], which belongs to one-step synthesis system. Figure 1 shows a schematic layout of the carbon/water nanofluid synthesis. Plasma arc welding equipment (400 GTS, Thermal Arc, Thermadyne, St. Louis, MO, USA) provided the heat source, and a vaporization chamber, cooling system, and collection system completed the system. The plasma arc provided the extreme high temperature inside the vaporization chamber, which melted and evaporated the graphite rods. Using this setup, we could control for working current, pulse frequency, and plasma gas and argon (Ar) carrier-gas flow rates. The pressure differential produced between the vaporization chamber and collection chamber induces vaporized carbon to move into the collection chamber. The nanofluid collection system and cooling system pre-cools distilled water to maintain a constant 3-5°C during the collection of nanofluid and to further suppress excess particle growth and clustering.

Bottom Line: The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM.The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water.The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Industrial Education, National Taiwan Normal University, No, 162, Sec, 1, He-ping E, Rd,, Da-an District, Taipei City 10610, Taiwan. tube5711@ntnu.edu.tw.

ABSTRACT
Heat dissipation from electrical appliances is a significant issue with contemporary electrical devices. One factor in the improvement of heat dissipation is the heat transfer performance of the working fluid. In this study, we used plasma arc technology to produce a nanofluid of carbon nanoparticles dispersed in distilled water. In a one-step synthesis, carbon was simultaneously heated and vaporized in the chamber, the carbon vapor and particles were then carried to a collector, where cooling furnished the desired carbon/water nanofluid. The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM. Crystal morphology was examined by XRD. Finally, the characterization include thermal conductivity, viscosity, density and electric conductivity were evaluated by suitable instruments under different temperatures. The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water. The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

No MeSH data available.


Related in: MedlinePlus