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Preparation and properties of copper-oil-based nanofluids.

Li D, Xie W, Fang W - Nanoscale Res Lett (2011)

Bottom Line: The effects of adding Cu nanoparticles on the thermal oxidation stability of the fluids were investigated by measuring the hydroperoxide concentration in the Cu/kerosene nanofluids.The hydroperoxide concentrations are observed to be clearly lower in the Cu nanofluids than in their base fluids.Appropriate amounts of metal nanoparticles added in a hydrocarbon fuel can enhance the thermal oxidation stability.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry and Chemical Engineering, Weifang University, Weifang 261061, China. danli830109@163.com.

ABSTRACT
In this study, the lipophilic Cu nanoparticles were synthesized by surface modification method to improve their dispersion stability in hydrophobic organic media. The oil-based nanofluids were prepared with the lipophilic Cu nanoparticles. The transport properties, viscosity, and thermal conductivity of the nanofluids have been measured. The viscosities and thermal conductivities of the nanofluids with the surface-modified nanoparticles have higher values than the base fluids do. The composition has more significant effects on the thermal conductivity than on the viscosity. It is valuable to prepare an appropriate oil-based nanofluid for enhancing the heat-transfer capacity of a hydrophobic system. The effects of adding Cu nanoparticles on the thermal oxidation stability of the fluids were investigated by measuring the hydroperoxide concentration in the Cu/kerosene nanofluids. The hydroperoxide concentrations are observed to be clearly lower in the Cu nanofluids than in their base fluids. Appropriate amounts of metal nanoparticles added in a hydrocarbon fuel can enhance the thermal oxidation stability.

No MeSH data available.


Viscosities of Cu nanofluids: (a) Cu/kerosene; (b) Cu/toluene; and (c) Cu/decahydronaphthalene.
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Figure 5: Viscosities of Cu nanofluids: (a) Cu/kerosene; (b) Cu/toluene; and (c) Cu/decahydronaphthalene.

Mentions: The effects of both temperature and mass fraction of the nanoparticles on the viscosities of the nanofluids were investigated. Figure 5 shows the results of viscosity measurements for different fluid-based nanofluids at the temperature range from 20 to 60°C. The viscosity of a nanofluid decreases with increasing temperature, in a manner similar to that of a pure base liquid. It increases somewhat with increasing concentration of the nanoparticles. The addition of nanoparticles with 1% of mass fraction leads to no more than 5% increase of the viscosity. Therefore, the formation of nanofluids has no significant effect upon the viscous resistance.


Preparation and properties of copper-oil-based nanofluids.

Li D, Xie W, Fang W - Nanoscale Res Lett (2011)

Viscosities of Cu nanofluids: (a) Cu/kerosene; (b) Cu/toluene; and (c) Cu/decahydronaphthalene.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211464&req=5

Figure 5: Viscosities of Cu nanofluids: (a) Cu/kerosene; (b) Cu/toluene; and (c) Cu/decahydronaphthalene.
Mentions: The effects of both temperature and mass fraction of the nanoparticles on the viscosities of the nanofluids were investigated. Figure 5 shows the results of viscosity measurements for different fluid-based nanofluids at the temperature range from 20 to 60°C. The viscosity of a nanofluid decreases with increasing temperature, in a manner similar to that of a pure base liquid. It increases somewhat with increasing concentration of the nanoparticles. The addition of nanoparticles with 1% of mass fraction leads to no more than 5% increase of the viscosity. Therefore, the formation of nanofluids has no significant effect upon the viscous resistance.

Bottom Line: The effects of adding Cu nanoparticles on the thermal oxidation stability of the fluids were investigated by measuring the hydroperoxide concentration in the Cu/kerosene nanofluids.The hydroperoxide concentrations are observed to be clearly lower in the Cu nanofluids than in their base fluids.Appropriate amounts of metal nanoparticles added in a hydrocarbon fuel can enhance the thermal oxidation stability.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry and Chemical Engineering, Weifang University, Weifang 261061, China. danli830109@163.com.

ABSTRACT
In this study, the lipophilic Cu nanoparticles were synthesized by surface modification method to improve their dispersion stability in hydrophobic organic media. The oil-based nanofluids were prepared with the lipophilic Cu nanoparticles. The transport properties, viscosity, and thermal conductivity of the nanofluids have been measured. The viscosities and thermal conductivities of the nanofluids with the surface-modified nanoparticles have higher values than the base fluids do. The composition has more significant effects on the thermal conductivity than on the viscosity. It is valuable to prepare an appropriate oil-based nanofluid for enhancing the heat-transfer capacity of a hydrophobic system. The effects of adding Cu nanoparticles on the thermal oxidation stability of the fluids were investigated by measuring the hydroperoxide concentration in the Cu/kerosene nanofluids. The hydroperoxide concentrations are observed to be clearly lower in the Cu nanofluids than in their base fluids. Appropriate amounts of metal nanoparticles added in a hydrocarbon fuel can enhance the thermal oxidation stability.

No MeSH data available.