Journal
THERMOCHIMICA ACTA
Volume 506, Issue 1-2, Pages 62-66Publisher
ELSEVIER
DOI: 10.1016/j.tca.2010.04.016
Keywords
Multi-walled carbon nanotube; Gemini surfactant; Thermal conductivity; Nanofluid
Funding
- Shanghai Educational Development Foundation and Shanghai Municipal Education Commission [07SG56]
- National Science Foundation of China [50876058]
- Shanghai Municipal Education Commission [08ZZ99, 09YZ447]
- Shanghai Institutions of Higher Learning
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Stable water based nanofluids containing multi-walled carbon nanotubes (MWNTs) were prepared using cationic gemini surfactant as stabilizer. Zeta potential measurements and Fourier transformation infrared spectra were employed to study the absorption mechanisms of the surfactants on the MWNT surfaces. The stability of the nanofluids was obtained using UV-vis absorption method. Results of thermal conductivity indicate that higher concentration of cationic gemini surfactant is a negative factor in improving the thermal conductivity of nanofluids. Increase of spacer chain length of cationic gemini surfactant gives rise to the sediment of MWNTs in the nanofluids, resulting in decrease of thermal conductivity enhancement of MWNT nanofluids. Mechanical ball-milling technology would be a new method to pretreat the pristine MWNTs. and using this method nanofluids with optimized thermal properties can be obtained. (C) 2010 Elsevier B.V. All rights reserved.
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