Limits...
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 prepared with different concentrations of (CH3COO)2Cu·H2O solution. (a) 0.1 mol·l-1; (b) 0.4 mol·l-1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211235&req=5

Figure 4: TEM images of CuO nanofluids prepared with different concentrations of (CH3COO)2Cu·H2O solution. (a) 0.1 mol·l-1; (b) 0.4 mol·l-1.

Mentions: Figure 4a,b are the TEM images of CuO nanofluids prepared with copper acetate concentration of 0.1 and 0.4 mol·l-1, respectively. Compared with typical nanofluids (obtained with concentration of 0.2 mol·l-1), it is clear that the size of primary nanoparticles remain almost the same (about 10 nm), but the morphology and size of nanoparticles cluster change with copper acetate concentration. When the concentration is 0.1 mol·l-1, the clusters are also chain-like structures with lengths in the range of 100-200 nm. It is longer than the clusters in typical samples. When the concentration is 0.4 mol·l-1, the primary nanoparticles aggregate and form irregular clusters consisted of 2-30 primary nanoparticles. The formation of chain-like cluster may be due to the orientation adhesion mechanism [27]. When the concentration of copper acetate is low, the collision probability of primary CuO nanoparticles is low; thus, the orientation adhesion is preponderant in the reaction process. Therefore, by changing the concentration of copper acetate, the size and structure of cluster could be adjusted.


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 prepared with different concentrations of (CH3COO)2Cu·H2O solution. (a) 0.1 mol·l-1; (b) 0.4 mol·l-1.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: TEM images of CuO nanofluids prepared with different concentrations of (CH3COO)2Cu·H2O solution. (a) 0.1 mol·l-1; (b) 0.4 mol·l-1.
Mentions: Figure 4a,b are the TEM images of CuO nanofluids prepared with copper acetate concentration of 0.1 and 0.4 mol·l-1, respectively. Compared with typical nanofluids (obtained with concentration of 0.2 mol·l-1), it is clear that the size of primary nanoparticles remain almost the same (about 10 nm), but the morphology and size of nanoparticles cluster change with copper acetate concentration. When the concentration is 0.1 mol·l-1, the clusters are also chain-like structures with lengths in the range of 100-200 nm. It is longer than the clusters in typical samples. When the concentration is 0.4 mol·l-1, the primary nanoparticles aggregate and form irregular clusters consisted of 2-30 primary nanoparticles. The formation of chain-like cluster may be due to the orientation adhesion mechanism [27]. When the concentration of copper acetate is low, the collision probability of primary CuO nanoparticles is low; thus, the orientation adhesion is preponderant in the reaction process. Therefore, by changing the concentration of copper acetate, the size and structure of cluster could be adjusted.

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.