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Preparation and thermal conductivity of CuO nanofluid via a wet chemical method.

Zhu H, Han D, Meng Z, Wu D, Zhang C - Nanoscale Res Lett (2011)

Bottom Line: The results showed that different copper salts resulted in different particle morphology.Nanofluids with different microstructures could be obtained by changing the synthesis parameters.The thermal conductivities of CuO nanofluids increased with the increase of particle loading.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Materials Science & Engineering, Qingdao University of Science & Technology, Qingdao, 266042, China. htzhu1970@163.com.

ABSTRACT
In this article, a wet chemical method was developed to prepare stable CuO nanofluids. The influences of synthesis parameters, such as kinds and amounts of copper salts, reaction time, were studied. The thermal conductivities of CuO nanofluids were also investigated. The results showed that different copper salts resulted in different particle morphology. The concentration of copper acetate and reaction time affected the size and shape of clusters of primary nanoparticles. Nanofluids with different microstructures could be obtained by changing the synthesis parameters. The thermal conductivities of CuO nanofluids increased with the increase of particle loading.

No MeSH data available.


TEM images of CuO nanofluids synthesized under different reaction times. (a) 12 h; (b) 25 h.
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Figure 5: TEM images of CuO nanofluids synthesized under different reaction times. (a) 12 h; (b) 25 h.

Mentions: Figure 5 is the TEM images of CuO nanofluids obtained with different reaction times. When the reaction time is 12 h (Figure 5a), average size of CuO primary nanoparticles is about 10 nm. CuO nanoparticles form flexural chains consisting of 30-50 primary particles. It is longer than the chain in typical sample (Figure 2b). When the reaction time was increased to 25 h (Figure 5b), the size of the primary particles is also about 10 nm, but the chain-like clusters do not exist any more. Instead, there are small aggregates composed of several primary particles. As mentioned above, the formation mechanism of chain-like cluster is orientation adhesion. With the increase of reaction time, the orientation adhesion degree increases; and thus, the length of the cluster increases. Why do the chain-like clusters destroy when the reaction time is 25 h? It needs more detailed research in future studies. The above results show that different microstructures could be obtained through changing the reaction time.


Preparation and thermal conductivity of CuO nanofluid via a wet chemical method.

Zhu H, Han D, Meng Z, Wu D, Zhang C - Nanoscale Res Lett (2011)

TEM images of CuO nanofluids synthesized under different reaction times. (a) 12 h; (b) 25 h.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211235&req=5

Figure 5: TEM images of CuO nanofluids synthesized under different reaction times. (a) 12 h; (b) 25 h.
Mentions: Figure 5 is the TEM images of CuO nanofluids obtained with different reaction times. When the reaction time is 12 h (Figure 5a), average size of CuO primary nanoparticles is about 10 nm. CuO nanoparticles form flexural chains consisting of 30-50 primary particles. It is longer than the chain in typical sample (Figure 2b). When the reaction time was increased to 25 h (Figure 5b), the size of the primary particles is also about 10 nm, but the chain-like clusters do not exist any more. Instead, there are small aggregates composed of several primary particles. As mentioned above, the formation mechanism of chain-like cluster is orientation adhesion. With the increase of reaction time, the orientation adhesion degree increases; and thus, the length of the cluster increases. Why do the chain-like clusters destroy when the reaction time is 25 h? It needs more detailed research in future studies. The above results show that different microstructures could be obtained through changing the reaction time.

Bottom Line: The results showed that different copper salts resulted in different particle morphology.Nanofluids with different microstructures could be obtained by changing the synthesis parameters.The thermal conductivities of CuO nanofluids increased with the increase of particle loading.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Materials Science & Engineering, Qingdao University of Science & Technology, Qingdao, 266042, China. htzhu1970@163.com.

ABSTRACT
In this article, a wet chemical method was developed to prepare stable CuO nanofluids. The influences of synthesis parameters, such as kinds and amounts of copper salts, reaction time, were studied. The thermal conductivities of CuO nanofluids were also investigated. The results showed that different copper salts resulted in different particle morphology. The concentration of copper acetate and reaction time affected the size and shape of clusters of primary nanoparticles. Nanofluids with different microstructures could be obtained by changing the synthesis parameters. The thermal conductivities of CuO nanofluids increased with the increase of particle loading.

No MeSH data available.