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Synthesis and thermal conductivity of microfluidic copper nanofluids

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figure 2 Characterization of the typical sample. TEM images were captured on a JEM-2000EX instrument. The average crystal size lindt is 10.4 nm calculated using Debye-Scherrer formula. All the peaks on the XRD pattern can be indexed to that of monoclinic CuO according to the literature (JCPDS,) the nanofluids were diluted narrative with distilled water and. The obtained CuO nanofluids could remain stable for 5 months with no visible precipitation at the bottom. The XRD pattern of the powder (obtained by drying the washed wet precipitate)) was recorded on a Rigaku D/Max r-A diffractometer. Figure 2d is the real photo thenicereport of the products. FileNo 80-1916).

Synthesis and thermal conductivity of microfluidic copper

Compared with typical nanofluids (obtained with concentration of 0.2 moll -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. It has the advantages in terms of controlling the particle size, reducing agglomeration of the nanoparticles, and producing nanofluids in a large scale. This method is a promising technique for commercial synthesis of nanofluids. 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. Nanoscale Research Letters2011 6 :181 DOI: X-6-181 Zhu et al; licensee Springer. 2011 Received: 1 December 2010. Accepted: 28 February 2011 Abstract In this article, a wet chemical method was developed to prepare stable CuO nanofluids. In a typical procedure, 600 ml 0.2 M copper acetate (Cu(CH3COO)2H2O) solution and 2 ml glacial acetic acid (CH3COOH ) were added into a round-bottomed flask and heated to boiling under magnetic stirring. 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. Figure 3 is the TEM images of above two nanofluids. When using CuCl 2 2H 2 O as copper source (Figure 3a the obtained particles in nanofluids are flake-like particles with width of 10-80 nm and length.

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Synthesis and thermal conductivity of microfluidic copper
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