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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.


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Particle size distribution of carbon/water nanofluid.
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Figure 4: Particle size distribution of carbon/water nanofluid.

Mentions: This study used the light-scattering size/zeta potential analyzer to determine the average nanoparticle size when suspended in distilled water. Figure 4 shows the particle size distribution for the carbon nanoparticles suspended in distilled water. Table 1 shows that for nanofluids at a working current of 70 A, the z-average particle size is 244.4 nm and the zeta potential is -24.4 mV. The distribution only has a single-peak, and dispersion is good. For nanofluids with a working current of 80 A, the z-average particle size is 284.6 nm, and a double-peak distribution appears at 298.9 and 4,590 nm. The zeta potential is -21 mV. From the distribution of measured values, we see that the secondary particle size is far greater than the primary particle size, as measured by SEM and TEM. This is mainly because agglomeration continues to occur to the suspended nanoparticles in distilled water and the tested particle size is greater than the particle size as observed by SEM and TEM.


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

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

Particle size distribution of carbon/water nanofluid.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Particle size distribution of carbon/water nanofluid.
Mentions: This study used the light-scattering size/zeta potential analyzer to determine the average nanoparticle size when suspended in distilled water. Figure 4 shows the particle size distribution for the carbon nanoparticles suspended in distilled water. Table 1 shows that for nanofluids at a working current of 70 A, the z-average particle size is 244.4 nm and the zeta potential is -24.4 mV. The distribution only has a single-peak, and dispersion is good. For nanofluids with a working current of 80 A, the z-average particle size is 284.6 nm, and a double-peak distribution appears at 298.9 and 4,590 nm. The zeta potential is -21 mV. From the distribution of measured values, we see that the secondary particle size is far greater than the primary particle size, as measured by SEM and TEM. This is mainly because agglomeration continues to occur to the suspended nanoparticles in distilled water and the tested particle size is greater than the particle size as observed by SEM and TEM.

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