Limits...
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.


TG/DTA curves: (a) O, O-di-n-cetyldithiophosphate, and (b) surface-modified Cu nanoparticles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211464&req=5

Figure 3: TG/DTA curves: (a) O, O-di-n-cetyldithiophosphate, and (b) surface-modified Cu nanoparticles.

Mentions: Figure 3 shows the TG and DTA curves of O, O-di-n-cetyldithiophosphate and its surface-modified Cu nanoparticles, respectively. It is seen from the TG curve that O, O-di-n-cetyldithiophosphate and Cu nanoparticles begin to lose weight at 110 and 210°C, respectively. An obvious mass loss ranging from 210 to 350°C is observed for the Cu nanoparticles, and the total mass loss is about 40%. From the TG analyses, it can be concluded that the modification agent is coated on Cu nanocores through strong interaction, but not a mixture or simple absorption between Cu nanoparticles and modification agent. If the products comprise the mixture of Cu nanoparticles and modification agent, then the modification layers can be rinsed off in the synthesis proceeding, and very large amount of mass loss in the TG curve should not occur.


Preparation and properties of copper-oil-based nanofluids.

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

TG/DTA curves: (a) O, O-di-n-cetyldithiophosphate, and (b) surface-modified Cu nanoparticles.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: TG/DTA curves: (a) O, O-di-n-cetyldithiophosphate, and (b) surface-modified Cu nanoparticles.
Mentions: Figure 3 shows the TG and DTA curves of O, O-di-n-cetyldithiophosphate and its surface-modified Cu nanoparticles, respectively. It is seen from the TG curve that O, O-di-n-cetyldithiophosphate and Cu nanoparticles begin to lose weight at 110 and 210°C, respectively. An obvious mass loss ranging from 210 to 350°C is observed for the Cu nanoparticles, and the total mass loss is about 40%. From the TG analyses, it can be concluded that the modification agent is coated on Cu nanocores through strong interaction, but not a mixture or simple absorption between Cu nanoparticles and modification agent. If the products comprise the mixture of Cu nanoparticles and modification agent, then the modification layers can be rinsed off in the synthesis proceeding, and very large amount of mass loss in the TG curve should not occur.

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.